Zoological Studies 46(4): 454-472 (2007)
Establishment of a New Genus for Arete borradailei Coutière, 1903 and
Athanas verrucosus Banner and Banner, 1960, with Redefinitions of
Arete Stimpson, 1860 and Athanas Leach, 1814 (Crustacea: Decapoda:
Alpheidae)
Arthur Anker1,* and Ming-Shiou Jeng2
1Smithsonian
2Research
Tropical Research Institute, Naos Unit 0948, APO AA 34002-0948, USA. E-mail:ankera@si.edu
Center for Biodiversity, Academia Sinica, Taipei 115, Taiwan. E-mail:jengms@gate.sinica.edu.tw
(Accepted October 5, 2006)
Arthur Anker and Ming-Shiou Jeng (2007) Establishment of a new genus for Arete borradailei Coutière, 1903
and Athanas verrucosus Banner and Banner, 1960, with redefinitions of Arete Stimpson, 1860 and Athanas
Leach, 1814 (Crustacea: Decapoda: Alpheidae). Zoological Studies 46(4): 454-472. Arete borradailei
Coutière, 1903 and Athanas verrucosus Banner and Banner, 1960 are transferred to Rugathanas gen. nov.,
based on several unique features on the chelipeds, 3rd pereiopods, antennules, and mouthparts. The establishment of Rugathanas enables the redefinition of Athanas Leach, 1814 and Arete Stimpson, 1860, and a formal revalidation of Arete, formerly a synonym of Athanas. Two important features, the number of pereiopodal
epipods and the number of carpal segments of the 2nd pereiopod, are variable within Rugathanas gen. nov.,
but may be used to distinguish Athanas from Arete. The distribution ranges of R. borradailei (Coutière, 1903)
comb. nov. and R. verrucosus (Banner and Banner, 1960) comb. nov. are considerably extended based on
recently collected material from the Ryukyu Is., Japan; Kenting, southern Taiwan; and Norfolk I., off eastern
Australia. http://zoolstud.sinica.edu.tw/Journals/46.4/454.pdf
Key words: Alpheidae, New genus, Athanas, Arete, Indo-Pacific.
T
armed with teeth, but without a fossa-tooth mechanism (e.g., Chace 1988) suggest that Athanas
sensu lato is a highly heterogeneous and perhaps
non-monophyletic assemblage.
Banner and Banner (1960) questioned the
validity of Arete Stimpson, 1860. They considered
the features used by Coutière (1899 1903) to distinguish between Arete and Athanas invalid, e.g.,
the number of pereiopodal epipods (2 in Arete and
3 in Athanas) and the number of segments in the
carpus of the 2nd pereiopod (4 in Arete and 5 in
Athanas), and formally placed Arete in synonymy
of Athanas. Although several workers (e.g.,
Holthuis 1993, Hayashi 1995, Nomura et al. 1996)
continued to treat Arete as a valid genus, without
discussing the synonymy proposed by Banner and
Banner (1960), the majority of workers accepted
he alpheid shrimp genus Athanas Leach,
1814 sensu lato (sensu Banner and Banner 1960
1973, Chace 1988) presently includes over 40
species in the eastern Atlantic and Indo-West
Pacific. Most species are small (< 10 mm in total
length) and inhabit coral reefs and rocky or
muddy-sandy bottoms; some species live in symbiosis (commensalism) with other animals, such
as thalassinideans, stomatopods, and echinoderms (Suzuki 1970, Banner and Banner 1973,
Gherardi 1991, Froglia and Atkinson 1998, Anker
et al. 2001, Hayashi 2002, Marin et al. 2005).
Athanas species are mainly characterized by the
presence of a triangular articulated plate on the
6th abdominal segment, and a well-developed,
distally acute rostrum. The variously developed
orbital teeth, and highly variable chelipeds, often
*To whom correspondence and reprint requests should be addressed.
454
Anker and Jeng -- New alpheid genus with redefinition of Athanas and Arete
this synonymy (e.g., Chace 1988). However,
Banner and Banner (1982) recognized that 2
closely related species originally described as
Arete borradailei Coutière, 1903 and Athanas verrucosus Banner and Banner, 1960 did not fit into
either the generic diagnoses of Arete nor Athanas,
and proposed reconsidering the validity of Arete, a
suggestion they subsequently did not return to.
Both Are. borradailei and Ath. verrucosus are
rarely collected shrimps. The latter species was
until now only known from the type locality,
Enewetak Atoll, Marshall Is. (Banner and Banner
1960). This is partly due to the small size and
cryptic lifestyles of these shrimps, which usually
live in crevices of dead and living corals or in
porous rocks overgrown with coralline algae. The
only efficient method of collecting this type of
cryptofauna is to carefully hammer these rocks
apart to extract small animals from deep holes and
,
crevices. During the first author s (AA) field trip to
Kenting National Park, southern Taiwan, 1 specimen of Ath. verrucosus was extracted by this
method from dead coral rubble, collected from
shallow water near the shore. We also examined
several specimens of this species from Emily Bay,
Norfolk I., off New South Wales, Australia, deposited in the Museum and Art Gallery of the Northern
Territory, Darwin, Australia (NTM). The second
author (MSJ) previously collected several specimens of Are. borradailei in Kenting. Through the
courtesy of Keiichi Nomura (Kushimoto Marine
Park Center, Kushimoto, Japan) we were able to
study 4 specimens of Are. borradailei from the
Ryukyu Archipelago. In addition, we examined 2
specimens of Are. borradailei from the southwestern Indian Ocean previously reported by Banner
and Banner (1983), and numerous specimens of
Athanas and Arete deposited in various museums.
The morphological features of Are. borradailei
and Ath. verrucosus clearly set these 2 species
apart from all other species of Athanas or Arete.
Therefore, a new genus, Rugathanas gen. nov., is
herein established to accommodate these 2
species and formally resurrect Arete from synonymy of Athanas. Arete sensu stricto (sensu
Stimspon 1860, not sensu Coutière 1903) and
Athanas sensu stricto (sensu Coutière 1899 1903,
not sensu Banner and Banner 1960) are redefined.
MATERIAL AND METHODS
The material used in this study is deposited in
the collections of the Museum and Art Gallery of
455
the Northern Territory, Darwin, Australia (NTM); the
Natural History Museum and Institute, Chiba,
,
Japan (CBM); the Muséum national d Histoire
naturelle, Paris, France (MNHN); the Zoological
Reference Collection, Raffles Museum of
Biodiversity Research, National University of
Singapore, Singapore (ZRC); Academia Sinica,
Taipei, Taiwan (ASIZ); and the Naturhistorisches
Museum in Wien, Vienna, Austria (NHMW).
All drawings were made with the aid of a camera lucida. The carapace length (CL) and total
length (TL) were measured in millimeters from the
tip of the rostrum to the posterior margin of the
carapace and telson, respectively. In cheliped
descriptions, the terms equal, subequal, and
unequal refer to size, while symmetrical, subsymmetrical, and asymmetrical refer to shape (general
shape of the palm, armature of the fingers, etc.).
Abbreviations used in the text include: Ar, arthrobranch; Ep, lobe-shaped epipod; Ex, exopod; Ma,
mastigobranch (strap-like epipod); Mxp, maxilliped;
P, pereiopod; Pd, podobranch; Pl, pleurobranch; r,
rudimentary; Se, setobranch; +, present; -, absent.
TAXONOMY
Rugathanas gen. nov.
Diagnosis: Body stout. Carapace smooth, not
setose. Frontal margin with relatively short, somewhat ascendant rostrum, bearing acute tip, with or
without subdistal tooth on ventral margin. Extracorneal teeth strong, acute, reaching or protruding
beyond anterior margin of eyes; supra-corneal
teeth usually well developed, acute; infra-corneal
teeth reduced or absent. Orbital hoods absent;
eyes exposed in dorsal and lateral views.
Pterygostomial margin angular, protruding, not
acute. Cardiac notch well developed. Second
abdominal pleuron greatly expanded in females.
Sixth abdominal somite with articulated plate at
posteroventral angle; preanal plate rounded.
Antennules with minute teeth on distal margin of
first segment; ventromesial carina of 1st segment
without tooth; lateral flagellum with rudimentary
secondary ramus. Antenna with stout basicerite,
with or without distolateral tooth; scaphocerite
short, broadly oval-shaped. Mandible with palp,
incisor process greatly expanded, distally with at
least 15 min teeth. Maxillule with bilobed palp,
ventral lobe with 1 seta, dorsal lobe unarmed.
Labrum swollen, conspicuously protruding, visible
in lateral view. Third maxilliped with penultimate
segment as long as wide; ultimate segment with
456
Zoological Studies 46(4): 454-472 (2007)
unarmed tip. First pereiopods (chelipeds) sexually
dimorphic, carried flexed; coxa unarmed mesially;
basis with rudimentary exopod; ischium robust,
unarmed mesially; chelae without linea impressa
on palm or cavity-tooth system on fingers. Male
chelipeds subequal or unequal, subsymmetrical or
asymmetrical (with major cheliped situated either
on left or right side); ischium armed with spines on
dorsal and usually ventral margin; merus swollen,
distally depressed; carpus elongated, vaseshaped, excavated ventrally; chela enlarged, oval,
compressed, slightly convex mesially, flattened laterally, dorsal and ventral margins rugose; linea
impressa absent; fingers unarmed or armed with
simple teeth. Female chelipeds equal, symmetrical; ischium usually unarmed or armed with several spines on dorsal margin; merus not or slightly
inflated, flattened ventrally; carpus cup-shaped,
more or less excavated ventrally; chela varying
from oval-shaped to slender, with smooth or
rugose margins, fingers unarmed. Carpus of 2nd
pereiopod bearing 4 or 5 segments. Third pereiopod with unarmed ischium and merus; carpus with
1 distal spine on ventral margin; propodus with
numerous ventral spines; dactylus simple, highly
extensible dorsally. Fifth pereiopod with feebly
developed propodal brush. Second pleopod with
appendix interna and appendix masculina in
males, with appendix interna only in females.
Telson with 2 pairs of dorsal spines and 2 pairs of
posterolateral spines; anal tubercles absent.
Gill/exopod formula showing great variation in
number of epipods (mastigobranchs/setobranchs),
as summarized in following table.
Pl
Ar
Pd
Ep
Ma
Se
Ex
Mxp1
Mxp2
Mxp3
P1
P2
P3
P4
P5
+
+
+
+
-/+
+
+
-/+
-/+
r
+
-/+
-/+
r
+
-/+
-
+
-
+
-
-
-
Type species: Rugathanas verrucosus
(Banner and Banner, 1960) comb. nov. [Athanas
verrucosus Banner and Banner 1960: 147]; type
locality: Enewetak Atoll, Marshall Is.
Other species included: Rugathanas borradailei (Coutière, 1903) comb. nov. [Arete borradailei Coutière 1903: 80]; type locality: Hulule
Male Atoll, the Maldives.
Etymology : Rugathanas is a combination of
the Latin adjective ruga (rugged, uneven), referring
to the characteristic rugosities on the margins of
the male chelae, and Athanas (a Greek king),
referring to its affinity with the genus Athanas.
Distribution: Indo-West Pacific from the Red
Sea and Madagascar to Japan, Australia, and
Samoa.
Remarks: Rugathanas may be separated
from both Athanas and Arete by numerous features on the frontal margin of the carapace, antennules, antennae, chelipeds, and mandible. For
instance, Rugathanas is characterized by the
unique shape of the male (and sometimes female)
chelipeds. The oval-shaped palm, compressed
and flattened laterally and with rugose dorsal and
ventral margins, and the vase-shaped, ventrally
excavated carpus (Figs. 1a, 2l, m, 3c-e, 4a, 5b, c)
are externally the most obvious features separating Rugathanas from Arete and Athanas. The
configuration of the frontal margin of the carapace
of Rugathanas is also characteristic of the genus
(Figs. 2a, b, 3a, b, 5a), the most important features
being the relatively short, ascendant rostrum, often
with a small subdistal tooth on the ventral margin
(vs. a long, straight rostrum, without a ventral tooth
in Athanas and Arete); the presence of supraorbital teeth (absent in all Arete and most Athanas
species, with the exceptions of Ath. djiboutensis
Coutière, 1897 and Ath. areteformis Coutière,
1903, cf. Fig. 8b); the absence of infra-corneal
teeth (usually absent in Arete, but often present in
Athanas); and the presence of strong extra-corneal
teeth reaching or sometimes protruding well
beyond the anterior margin of the cornea (vs. usually not reaching far beyond this margin in Arete
and Athanas, but with some exceptions, e.g., Ath.
areteformis, cf. Fig. 8a).
Rugathanas also differs from Arete and
Athanas by the considerably expanded incisor
process of the mandible (“psalistome”in Banner
and Banner 1960), which is distally furnished with
numerous (usually more than 15) minute teeth
(Figs. 2g, h). In Arete and Athanas, the incisor
process is not or only slightly expanded, distally
bearing 5-12 teeth (A. Anker pers. obs.). One
notable exception is again Ath. areteformis, in
which the incisor process is also expanded and
distally bears around 15 teeth (Figs. 8c, d).
However, this species has very differently shaped
chelipeds (Figs. 8e-j) and plainly belongs to the
genus Athanas (see below). In species of
Rugathanas, the labrum is greatly swollen (Fig.
2c), sometimes conspicuously protruding in lateral
view (Fig. 3b), apparently to accommodate the
expanded incisor process of the mandible. In con-
Anker and Jeng -- New alpheid genus with redefinition of Athanas and Arete
trast, the labrum of Ath. areteformis is only moderately swollen and not visible in lateral view.
Other features distinguishing Rugathanas
from Arete and Athanas are the stouter and (compared to other antennal parts) larger basicerite
(Figs. 2a, 3b); the unarmed ventromesial carina on
the 1st antennular segment (Fig. 2d) (vs. armed
with strong tooth in all species of Arete and
Athanas, partly visible in firure. 8a; see also Bruce
1990); the tip of the ultimate segment of the 3rd
maxilliped without spines (vs. with spines in all
Arete and most Athanas species); and the dorsally
more extensible dactylus of the 3rd-5th
pereiopods, which can be placed in an almost perpendicular position to the propodus (Figs. 2p, q).
This unusually flexible articulation is strikingly similar to that of the unrelated alpheid genus
Metalpheus Coutière, 1906, in which, however, the
dactylus extension is facilitated by a small ventral
sclerite (Banner 1959). Rugathanas also differs
from Athanas by the strongly dentate margin of the
1st and 2nd segments of the antennular peduncle
(Figs. 3a, 5a) (vs. straight or finely toothed in
Athanas), and the much shorter penultimate segment of the 3rd maxilliped, which is about as long
as wide in Rugathanas (Fig. 2k) (vs. distinctly
longer than wide in Athanas).
The number of carpal segments in the 2nd
pereiopod varies from 4 in R. borradailei (Fig. 2o)
to 5 in R. verrucosus (Fig. 4a). The strap-like
epipods (mastigobranchs) are present on the 3rd
maxilliped and 1st and 2nd pereiopods in R. verrucosus, but are absent in R. borradailei. Although
these 2 important characters are variable within
Rugathanas, they remain valuable for differentiating Rugathanas from Arete sensu stricto and
Athanas sensu stricto (see below). Within the
Alpheidae, an intrageneric variation in the number
of carpal segments is not rare and also occurs in
Synalpheus Bate, 1888 (4 to 5, see Banner and
Banner 1975), Leptalpheus Williams, 1965 (4 to 5,
see Anker et al. 2006c), Alpheopsis Coutière,
1896, and Prionalpheus Banner and Banner 1960
(3-5, see Banner and Banner 1971 1973, Bruce
1990b, Martínez-Iglesias and Carvacho 1991).
Similarly, intrageneric variation in the number of
pereiopodal epipods was also reported in at least 2
other genera, Alpheopsis (2-4, see Coutière 1899,
Anker et al. 2005) and Athanas (see below).
Rugathanas, Athanas and Arete are part of a
larger generic complex (athanoid complex); other
athanoid genera are Athanopsis Coutière, 1896 (5
species), Pseudathanas Bruce, 1983 (1 species),
Acanthanas Anker, Poddoubtchenko and Jeng,
457
2006 (1 species), and Aretopsis De Man, 1910 (1
or 2 species). This complex forms a well-defined
monophyletic clade (the clade AP of Anker et al.
2006a) within the family Alpheidae. According to
Anker et al. (2006a) Athanopsis and Pseudathanas are sister genera, as are Arete and
Aretopsis. Rugathanas (represented by R. borradailei) formed a sister group to Athanas.
Athanas was found to be non-monophyletic; however, first, this genus was not adequately represented in this analysis, and second, the position of
Ath. squillophilus as a sister to Athanopsis and
Pseudathanas is rather questionable. The recently
described Acanthanas was not included in Anker
,
et al. s (2006a) cladogram, but based on its morphological features (see Anker et al. 2006b), this
genus appears to form a separate lineage somewhere within the clade Athanas - Rugathanas.
Key to the genera of the athanoid generic complex and to the species of Rugathanas
1a.
1b.
2a.
2b.
3a.
3b.
4a.
4b.
5a.
5b.
6a.
6b.
7a.
7b.
Rostrum distally rounded ................................................ 2
Rostrum distally acute ..................................................... 3
Chelipeds always carried extended, with dactylus in ventral position ......................................................... Aretopsis
Chelipeds carried flexed (propodus fitting in a deep excavation on merus), dactylus in dorsal or dorsolateral position when chela extended ................................ Athanopsis
Eyestalks with two conspicuously projecting acute spines
........................................................................ Acanthanas
Eyestalks without spines ................................................. 4
Diaeresis of uropodal exopod with row of spines
.................................................................... Pseudathanas
Diaeresis of uropodal exopod without spines .................. 5
Male chelipeds with oval-rounded chelae, palm with
rugose margins, carpus vase-shaped, ventrally excavated; labrum swollen, protruding; mandible with greatly
expanded incisor process; supra-orbital teeth present
......................................................................Rugathanas 6
Male chelipeds with elongated or oval-shaped chelae,
palm with non-rugose margins (sometimes with tubercles), carpus variably shaped; labrum neither swollen nor
protruding; incisor process of mandible not or only slightly
expanded; supra-orbital teeth present or absent ............ 7
Strap-like epipods absent; 2nd pereiopod with 4-segmented carpus; male chelipeds asymmetrical; female chelipeds only slightly enlarged ......................... R. borradailei
Strap-like epipods present on Mxp3 and P1-2; 2nd pereiopod with 5-segmented carpus; male chelipeds subsymmetrical; female chelipeds greatly enlarged .......................
..................................................................... R. verrucosus
Strap-like epipods present on Mxp3 and P1-2; 2nd pereiopod with 4-segmented carpus; cheliped ischium with
strong process mesially; supra-orbital teeth absent
................................................................................... Arete
Strap-like epipods present on Mxp3 and P1-3 (exceptionally on P1-2 or P1-4); 2nd pereiopod with 5-segmented
carpus; cheliped ischium without a strong process mesially; supra-orbital teeth absent or present .............. Athanas
458
Zoological Studies 46(4): 454-472 (2007)
Rugathanas borradailei (Coutière, 1903) comb.
nov.
(Figs. 1-3, 6a)
Arete borradailei Coutière 1903: 80, figs. 19-24; Coutière 1905:
861, fig. 133; Jacquotte 1964: 180; Banner and Banner
1966a: 152; Banner and Banner 1983: 73; Chace 1988:
61.
Arete ghardaqensis Ramadan 1936: 15, pl. 1, figs. 2-8.
Athanas ghardaquensis Banner and Banner 1981: 42; Banner
and Banner 1983: 73.
Athanas polynesia Banner and Banner 1966a: 152, fig. 7;
Banner and Banner 1982: 302, fig. 93; Banner and
Banner 1983: 73.
Material examined: CBM-ZC 8469, 1 male
(CL 2.6, TL 8.3), Japan, S Ryukyu Arch., Yaeyama
Group, Kuro-shima, Nakamoto, dead coral
crevices, intertidal, coll. K. Nomura, 24 Sep. 1987
[YMP-672c]; MNHN-Na 15778, 2 ovigerous
females (CL 2.5, TL 8.5; CL 2.7, TL 8.5), Japan, S
Ryukyu Arch., Yaeyama Group, Kuro-shima, Iko,
dead coral crevices, depth 2 m, coll. K. Nomura,
(a)
1 mm
a
(b)
1 mm
b
Fig. 1. Rugathanas borradailei (Coutière, 1903) comb. nov.: (a) male from Kenting, southern Taiwan (ASM); (b) ovigerous female from
the Ryukyu Is., Japan (MNHN).
459
Anker and Jeng -- New alpheid genus with redefinition of Athanas and Arete
29 Aug. 1986 [YMP-163]; MNHN-Na 15779, 1
ovigerous female (CL 2.8, TL 8.1) Japan, S
Ryukyu Arch., Yaeyama Group, Kuro-shima,
Urabishi, dead coral crevices, depth 3 m, coll. K.
Nomura, 17 Jul. 1999 [YMP-2395]; ASIZ 72761, 1
male (CL 5.3, TL 15.3), 1 female (CL, TL not mea-
0.5 mm
a-r
(b)
(c)
(a)
(l)
(k)
(n)
(d)
(m)
(j)
(p)
(q)
(e)
(i)
(f)
(g)
(h)
(o)
(r)
(s)
(r)
1 mm
s
Fig. 2. Rugathanas borradailei (Coutière, 1903) comb. nov., ovigerous female (a-k, o-s) and male (l-n) from southwestern Madagascar
(MNHN): (a) frontal region, lateral view; (b) frontal margin of carapace, dorsal view; (c) frontal region, ventral view showing bases of
antennules and antennae, labrum, and position of mouthparts; (d) antennule, lateral view; (e) same, peduncle, dorsal view; (f) scaphocerite; (g, h) mandible from 2 different aspects; (i) maxillule; (j) 2nd maxilliped; (k) 3rd maxilliped; (l) left cheliped, lateral view; (m) same,
chela, mesial view; (n) same, coxa and basis with exopod; (o) 2nd pereiopod; (p) 3rd pereiopod; (q) 5th pereiopod, distal carpus, propodus, and dactylus; (r) uropod; (s) abdomen and cephalothorax (frontal appendages and pereiopods not drawn).
460
Zoological Studies 46(4): 454-472 (2007)
sured), S Taiwan, Kenting National Park, coll. M.S.
Jeng; MNHN-Na 4604, 1 male (CL 2.7, TL 8.8), La
Réunion, reef crevices, coll. M. Peyrot-Clausade;
MNHN-Na 4610, 1 ovigerous female (CL 2.8, TL
8.8), Toliara (Tuléar), Madagascar, from reef
crevices, coll. M. Peyrot-Clausade.
Diagnosis: Male chelipeds enlarged, varying
from subequal and subsymmetrical in immature
individuals to unequal and asymmetrical in adults;
ischium with spines; palm expanded, ventral margin rugose, without papillae; fingers unarmed or
with small teeth. Female chelipeds feebly
enlarged, equal, symmetrical; ischium usually without spines, palm not expanded. Second pereiopod
with 4-segmented carpus. Strap-like epipods
(mastigobranchs) absent. For complete description see Banner and Banner (1982 1983).
Size: Small-sized shrimp; largest specimen
examined, a male from Taiwan (Fig. 1a), measured
15.3 mm TL; the average TL of Australian specimens (reported as Ath. polynesia) being 8 mm
(Banner and Banner 1982).
Colour : Semitransparent with greenish or
olive tinge and feebly marked yellowish-orange
bands on abdomen tail fan and chelae; pale-brown
inner organs visible due to transparence; eggs
green (Fig. 6a).
Habitat: Crevice-dweller on coral reefs. Most
specimens from the western Indian Ocean were
found in cavities of coral rocks overgrown with
coralline algae, in groove and spur system on the
outer reef edge to 25 m deep; in sections of reef
flat and a pinnacle on the inner slope; in dead and
overgrown coral heads, as well as among branches of living corals, e.g., Acropora variabilis
(Klunzinger, 1879) and Stylophora mordax (Dana,
1846) (Banner and Banner 1983). Jacquotte
(1964) found several specimens in boring holes of
the sea urchin Stomopneustes variolaris (Lamarck,
1816). The Australian specimens (reported as
Ath. polynesia) inhabited areas covered with
encrusting coralline algae in 2-7 m (Banner and
Banner 1982).
Distribution: Maldives: Hulule Malé Atoll (type
(a)
(b)
(d)
1 mm
b-e
(f)
(e)
(c)
0.2 mm
f
0.5 mm
a
Fig. 3. Rugathanas borradailei (Coutière, 1903) comb. nov., male from Samoa reported as Athanas polynesia Banner and Banner,
1966 (a-e), and female from Kenting, southern Taiwan (ASIZ) (f): (a) frontal region; (b) frontal region with protruding labrum and 3rd
maxilliped, lateral view; (c) major cheliped, lateral view; (d) same, carpus and chela, mesial view; (e) minor cheliped, mesial view (a-e,
adapted from Banner and Banner 1966a).
Anker and Jeng -- New alpheid genus with redefinition of Athanas and Arete
locality of R. borradailei) (Coutière 1903 1905);
Egypt: Hurghada (type locality of Are. ghardaqensis) (Ramadan 1936); Gulf of Aqaba (Banner and
Banner 1981); Somalia; La Réunion; Mauritius
(Banner and Banner 1983); Madagascar
(Jacquotte 1964, Banner and Banner 1983);
Philippines: Negros I. (Chace 1988); Australia:
Lizard I. off Queensland (type locality of Ath. polynesia) (Banner and Banner 1982); Samoa (Banner
and Banner 1966a); southern Taiwan: Kenting;
southern Japan: Ryukyu Is. (present study).
Remarks: The taxonomic statuses of Are.
ghardaqensis Ramadan, 1936 and Ath. polynesia
Banner and Banner, 1966 were reviewed by
Banner and Banner (1983), who placed both nominal species in synonymy with Ath. borradailei (now
R. borradailei). Those authors concluded that the
chelipeds of R. borradailei are variable and sexually dimorphic: slender, symmetrical, with a few or no
spines on the ischium in females (Coutière 1905:
461
fig. 135c, Banner and Banner 1982: fig. 93k); and
robust, subsymmetrical or asymmetrical, with usually strong spines on ischium in males (Banner and
Banner 1966a: figs. 7e-g, 1982: figs. 93c-e).
However, other features of R. borradailei, such as
the development of the orbital teeth, the shape of
the rostrum, and the armature of the antennal
basicerite, are also variable (Ramadan 1936,
Banner and Banner 1983). Therefore, R. borradailei cannot be excluded from either being a
variable species or a species complex.
Rugathanas verrucosus (Banner and Banner,
1960) comb. nov.
(Figs. 4, 5, 6b)
Athanas verrucosus Banner and Banner 1960: 147, fig. 4;
Banner and Banner 1968: 270; Banner and Banner 1983:
75.
Material examined: NTM Cr001663, 2 males
(a)
1 mm
(b)
Fig. 4. Rugathanas verrucosus (Banner and Banner, 1960) comb. nov.: (a) male from Kenting, southern Taiwan (ASIZ); (b) ovigerous
female (left) and male (right) from Norfolk I. (NTM) showing sexual dimorphism in the development of the chelipeds.
462
Zoological Studies 46(4): 454-472 (2007)
(CL 4.5, TL 12.7; CL 2.7, TL 7.4), 1 ovigerous
female (CL 5.4, TL 15.0), Point Hunter, Emily Bay,
Norfolk I., off New South Wales, Australia, 29 03.8'S
167 57.3'E, depth 0-0.25 m, Sta. HL 84-21, coll.
H. Larson, det. A.J. Bruce, 18 Apr. 1984; NTM
Cr001663, 2 males (CL 2.3, TL 7.2; CL 4.2, TL
11.8), 4 ovigerous females (smallest, CL 3.8, TL
10.1; largest, CL 4.6, TL 12.3), Point Hunter, Emily
Bay, Norfolk I., off New South Wales, Australia,
29 03.8'S 167 57.3'E, depth 0-0.25 m, Sta. HL
84-20, coll. H. Larson, det. A.J. Bruce, 17 Apr.
2004; ASIZ 73699, 1 male (CL 3.4, TL 10.1), S
Taiwan, Kenting National Park, from coral rocks,
depth 0.5-2 m, coll. A. Anker, 1 Oct. 2004.
Diagnosis: Male chelipeds subequal, subsymmetrical, ischium with spines; palm expanded, ventral margin rugose, distoventral portion of palm,
pollex, and proximal portion of dactylus with papillae (i.e., small subacute or rounded tubercles); fingers armed with teeth. Female chelipeds
enlarged, slightly less stout than male chelipeds,
equal, symmetrical; ischium with spines; palm less
expanded than in male, with papillae. Second
pereiopod with 5-segmented carpus. Strap-like
epipods (mastigobranchs) present on 3rd maxilliped and 1st and 2nd pereiopods. For complete
description see Banner and Banner (1960).
Size: Small-sized shrimp; type specimen
measuring 3.9 mm CL and 11 mm TL (Banner and
Banner 1960); the Kenting male specimen only
slightly smaller, at 3.4 mm CL and 10.1 mm TL; the
largest examined specimen, an ovigerous female
from Norfolk I., at CL 5.4 mm and TL 15.0 mm.
Colour : Semitransparent, with purple-greenish bands on abdomen; fingers of chela with golden-yellow tinge; setae fringing uropods and telson
golden-brown (Fig. 6b).
Habitat : In Enewetak, the habitat of R. verrucosus was described as“coralline ridge, ocean
(windward) reef”and“coralline ridge, and ends of
surge channels, exposed about 0.3 meters above
0.0 tides; ridge dense and hard, very irregular and
without the usual smooth algal surface ... from
superficial burrows, roofed over by calcareous
algal sheets”(Banner and Banner 1960 1968).
The single Kenting specimen was found in a
crevice during process of breaking apart coral
rocks and rubble collected in shallow water (0.5-2
°
°
°
°
(b)
(a)
(c)
1 mm
a-c
(e)
(d)
(f)
1 mm
d-f
Fig. 5. Rugathanas verrucosus (Banner and Banner, 1960) comb. nov., male from Kenting, southern Taiwan (ASIZ) (a-c); ovigerous
female from Norfolk I. (NTM) (d-f): (a) frontal region; (b) male minor chela, lateral view; (c) male major chela, lateral view; (d) female
cheliped, lateral view; (e) same, mesial view; (f) abnormal telson.
Anker and Jeng -- New alpheid genus with redefinition of Athanas and Arete
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
463
Fig. 6. Habitus of some species of Rugathanas gen. nov. (a, b), Arete Stimpson, 1860 (c, d), and Athanas Leach, 1814 (e-h): (a)
Rugathanas borradailei (Coutière, 1903) comb. nov., ovigerous female from Kenting, southern Taiwan; (b) Rugathanas verrucosus
(Banner and Banner, 1960) comb. nov., male from Kenting, southern Taiwan; (c) Arete cf. dorsalis Stimpson, 1860, specimen from
southern Japan; (d) Arete cf. dorsalis, shrimp in situ among spines of a sea urchin, Lord Howe I., off eastern Australia; (e) Athanas
areteformis Coutière, 1903 (Ath. nitescens group), male from southern Japan; (f) Athanas nitescens (Leach, 1814) (Ath. nitescens
group), male from Banyuls-sur-Mer, Mediterranean coast of France; (g) Athanas japonicus Kubo, 1936 (Ath. dimorphus group), ovigerous female from southern Japan; (h) Athanas amazone Holthuis, 1951 (Ath. dimorphus group), male from Banyuls-sur-Mer,
Mediterranean coast of France (photograph credits: a, M.S. Jeng; b, A. Anker, c, e, g, M. Itoh; d, N. Coleman; f, h, P. Lecomte leg. P.
Noël).
464
Zoological Studies 46(4): 454-472 (2007)
m) on a near-shore, exposed reef. The Norfolk I.
specimens were collected on a rocky reef, at
depths reaching from low tide mark to 0.25 m.
Distribution: Marshall Is.: Enewetak Atoll (type
locality, Banner and Banner 1960 1968); Australia:
Norfolk I.; southern Taiwan: Kenting (present
study).
Remarks: In R. verrucosus, the male chelipeds can be classified as subsymmetrical (Figs.
5b, c), and the female chelipeds are generally only
slightly weaker than the male chelipeds (Figs. 3,
5d, e, see also Figs. 3). In contrast to this, in R.
borradailei, the heterochelate condition (asymmetry) in males (Fig. 3c, e) and the sexual dimorphism (chelipeds significantly larger in males, see
Figs. 1a, b, 3c-f) appear to be more pronounced.
Ovigerous females of R. verrucosus from Norfolk I.
carried numerous (several dozen) relatively smallsized eggs. One of the ovigerous females from
Norfolk I. had an aberrant number of spines on the
telson: 4 dorsal spines + 1 posterolateral spine on
1 side, and 2 dorsal and 2 posterolateral spines
(typical condition) on the other side (Fig. 5f).
Arete Stimpson, 1860 sensu stricto
Arete Stimpson 1860: 32.
Diagnosis: Body relatively stout. Carapace
smooth, not setose. Frontal margin with long,
straight rostrum, bearing acute tip, without subdistal tooth on ventral margin. Extra-corneal teeth
acute, not protruding beyond anterior margin of
eye; supra-corneal teeth absent or feebly developed; infra-corneal teeth absent. Orbital hoods
absent; eyes exposed in dorsal and lateral views.
Pterygostomial margin usually rounded or angular,
sometimes subacute. Cardiac notch well-developed. Sixth abdominal segment with articulated
plate at posteroventral angle; preanal plate acutely
produced. Antennules with finely serrated distal
margin of 1st segment; ventromesial carina of 1st
segment with strong tooth; lateral flagellum with
(a)
(i)
(b)
(g)
(h)
(e)
1 mm
g
(d)
(c)
(f)
1 mm
a-f, h, i
Fig. 7. Arete cf. indicus Coutière, 1903, 2 males from Sesoko Beach, Okinawa (ZRC) (a-f, h, i) and male from Sri Lanka (NHMW) (g):
(a) frontal region, lateral view; (b) same, dorsal view; (c) left cheliped, lateral view; (d) same, coxa to carpus, mesial view; (e) same,
chela and carpus, lateral view; (f) fingers of chela of a different specimen, lateral view; (g) chela fingers of a larger specimen, mesial
view; (h) 2nd pereiopod; (i) 3rd pereiopod.
465
Anker and Jeng -- New alpheid genus with redefinition of Athanas and Arete
well-developed secondary ramus. Antenna with
normal, not particularly stout basicerite, distolateral
tooth always present; scaphocerite broadly oval or
rounded. Mandible with palp, incisor process
slightly expanded, distally with no more than 12
small teeth. Maxillule with bilobed palp, both ventral and dorsal lobes with setae. Labrum not
swollen or protruding. Third maxilliped with distally
projecting dorsal margin of antepenultimate segment; penultimate segment rectangular, about as
long as or slightly longer than wide; ultimate segment with short spines on tip. First pereiopods
(chelipeds) feebly sexually dimorphic, equal or
subequal, usually subsymmetrical, sometimes
asymmetrical (major cheliped situated on either
side), stout, carried extended with dactylus in lateral or ventrolateral position; coxa unarmed mesially;
ischium usually with strong tooth mesially and with
lobes or teeth furnished with spines on dorsal margin; basis with rudimentary exopod; merus robust,
flattened ventrally; carpus swollen, cup-shaped,
embracing proximal portion of palm distally, ventral
side somewhat flattened, not deeply excavated;
chela smooth, without sculpturing, compressed;
palm sometimes with acute distal projection on
mesial side proximal to articulation with dactylus,
without or with feebly marked linea impressa; fingers armed with teeth, sometimes interrupted by
large hiatus, without cavity-tooth system. Carpus
of 2nd pereiopod bearing 4 segments. Third
pereiopod with ischium unarmed or bearing 1
spine on ventrolateral margin; merus without
spines, sometimes with distoventral margin ending
in angular or acute projection; carpus unarmed;
propodus armed with spines; dactylus stout, biunguiculate. Fifth pereiopod with poorly developed
propodal brush (at most 3 rows of setae). Second
pleopod with appendix interna and appendix masculina in males and sometimes in females. Telson
with 2 pairs of dorsal spines and 2 pairs of pos-
(b)
(a)
(g)
(e)
1 mm
a, b, e, f, h-m
(j)
(i)
(h)
(f)
(d)
(k)
(c)
(l)
0.5 mm
c-d, g
(m)
Fig. 8. Athanas areteformis Coutière, 1903, male from Papua New Guinea (MNHN): (a) frontal region, lateral view; (b) frontal margin of
carapace, dorsal view; (c, d) mandible from 2 different aspects; (e) left (major) cheliped, mesial view; (f) same, chela and carpus, mesial
view; (g) same, coxa and basis with exopod; (h) right (minor) cheliped, mesial view; (i) same, chela and carpus, mesial view; (j) same,
chela fingers, lateral view; (k) 2nd pereiopod; (l) 3rd pereiopod; (m) 5th pereiopod.
466
Zoological Studies 46(4): 454-472 (2007)
terolateral spines; anal tubercles lacking. Gill/exopod formula summarized in following table.
Pl
Ar
Pd
Ma
Se
Ex
Mxp1
Mxp2
Mxp3
P1
P2
P3
P4
P5
+
+
+
+
+
+
+
r
+
+
+
r
+
+
-
+
-
+
-
-
-
1942: 82 (for synonymy see Banner and Banner
1960 1973, Miya and Miyake 1968).
Arete sp. nov. 1 - Athanas indicus - Suzuki
1970: 5 (not Coutière 1903).
Arete sp. nov. 2 - Athanas dorsalis - Suzuki
1970: 12 (not Stimpson 1860).
Distribution: Indo-West Pacific: Red Sea,
Djibouti, Madagascar, La Réunion, Maldives,
Seychelles, Sri Lanka, Japan (including Ryukyu
Is.), China, Taiwan, Philippines, Indonesia,
Australia (including Lord Howe I.), Micronesia,
Melanesia, French Polynesia.
Remarks: Arete, as redefined here, may be
easily separated from Rugathanas by numerous
morphological features (see above), and from
Athanas by the stouter chelipeds (Fig. 7c, e) with
large, oval-shaped chelae (vs. slenderer in
Athanas, Figs. 8e, h, 9); the ischium of the chelipeds bearing a strong mesial process (Fig. 7d)
(unarmed in Athanas); the carpus of the 2nd
pereiopods bearing 4 segments (Fig. 7h) (vs. 5 in
Athanas, Fig. 8k); the distoventral margin of the
merus of the 3rd pereiopod being angular or subacute (Fig. 7i) (vs. rounded in Athanas, Fig. 8l); the
dactylus of the 3rd to 5th pereiopods stout (Fig. 7i)
(vs. usually slender in Athanas, Fig. 8l); the straplike epipods or mastigobranchs present on 1st and
2nd pereiopods (vs. on 1st to 3rd or 4th
pereiopods in Athanas); and the preanal plate of
the 6th abdominal somite being acutely produced
towards the telson (vs. rounded, not produced in
Athanas). Furthermore, the antepenultimate seg-
Type species: Arete dorsalis Stimpson 1860:
32; type locality: Hong Kong. Synonyms: Athanas
mascarenicus Richters 1880: 164; Arete dorsalis
pacificus Coutière 1903: 84; Arete maruteensis
Coutière 1905: 866; Arete maruteensis salibabuensis de Man 1910: 313; ? Arete kominatoensis - Suzuki 1970: 2 (not Kubo 1942).
Other species included: Three described and
at least 2 undescribed species (K. Nomura, pers.
obs.; A. Anker pers. obs.).
Arete acanthocarpus (Miya and Miyake 1968)
[Athanas acanthocarpus Miya and Miyake 1968:
157]; type locality: Okinawa, Japan.
Arete amboinensis de Man 1910: 25; type
locality: Ambon, Indonesia. Specific status needs
confirmation.
Arete indicus Coutière 1903: 84; type locality:
not designated, type specimens from Djibouti and
Hulule Male Atoll, Maldives. Synonyms: Arete
iphianassa de Man 1910: 312; Arete intermedius
Yu 1931: 513; ? Athanas kominatoensis Kubo
(a)
(b)
1 mm
b
1 mm
a
(c)
(e)
(d)
1 mm
c-f
(f)
Fig. 9. Chelipeds of 3 species from the Athanas nitescens group: (a) Athanas grimaldii Coutière, 1911, male from Senegal (MNHN),
major cheliped, carpus, and chela, mesial view; (b) Athanas granti Coutière, 1908 from southern Australia, type (MNHN), major cheliped, carpus, and chela, mesial view; (c-f) Athanas cf. nitescens (Leach, 1814) from Senegal (MNHN), (c) male cheliped, lateral view;
(d) same, chela and carpus, mesial view; (e) female cheliped, lateral view; (f) same, chela and carpus.
Anker and Jeng -- New alpheid genus with redefinition of Athanas and Arete
ment of the 3rd maxilliped usually projects
distodorsally in Arete (see Bruce 1990a), but not in
Rugathanas or Athanas. The propodal brush on
the 5th pereiopod is poorly developed in both
Arete (cf. Bruce, 1990a) and Rugathanas (Fig. 2q),
but is well-developed in Athanas (Fig. 8m).
In Arete, both males and females bear
enlarged, stout chelipeds, with broadened chelae
that are carried extended forward, with the dactylus situated in lateral or ventrolateral position (Fig.
6c, d). The chelipeds of Athanas are highly variable in shape (cf. Figs. 6e-h), and may be carried
either extended (Ath. nitescens (Leach, 1814)
species group, cf. Figs. 6e, f), or folded (Ath.
dimorphus Ortmann, 1894 species group, cf. Figs.
6g, h). The Ath. nitescens group may have some
affinities with Arete, but in none of the species of
this group, the chelae are as broad as in Arete
(compare Figs. 6c, d, 7c-g and Figs. 6e, f, 8e-h, 9),
which actually look like“mini-lobsters”(Figs. 6c,
d).
All Arete species are characterized by a 4segmented carpus in the 2nd pereiopod and the
presence of strap-like epipods on the 1st and 2nd
pereiopods. In the vast majority of Athanas spp.,
the carpus of the 2nd pereiopod is composed of 5
,
segments (A. Anker pers. obs.). Kemp s (1915)
reported specimens of Ath. polymorphus Kemp,
1915 from Chilka Lake (India) that had either 4 or
5 segments, but in 7 examined specimens of Ath.
polymorphus from Singapore, the carpus had 5
segments (Anker 2003). In Ath. squillophilus
Hayashi, 2002, the number of carpal segments
varies from 5 to 6 (Hayashi 2002). One of us (AA)
also examined a specimen of Ath. dimorphus with
6 instead of the typical 5 carpal segments. In most
species of Athanas, the strap-like epipods are present on the 1st-3rd pereiopods, although Ath. ohsimai Yokoya, 1936 appears to have a complete epipod set, i.e., in this species, the strap-like epipods
are present on the 1st-4th pereiopods (Yokoya
1936). Banner and Banner (1960) reported an
infraspecific variation in the number of pereiopodal
epipods in a population of Ath. djiboutensis
Coutière, 1897, with most specimens having
epipods on the 1st and 2nd pereiopods, and only
some on the 1st-3rd pereiopods.
Despite all the aforementioned exceptions,
the combination of the cheliped features (e.g.,
chelae broad, oval-shaped in Arete, more or less
elongated in Athanas); the number of carpal segments in the 2nd pereiopod (4 in Arete, 5 in
Athanas, exceptionally 4 or 6); and the number of
pereiopodal epipods (on P1 and P2 in Arete, on
467
P1-3 in Athanas, exceptionally on P1 and P2 or
P1-4) enables Arete to be distinguished from
Athanas.
Arete is also ecologically distinct from
Rugathanas and Athanas. All Arete species are
obligate symbionts of sea urchins (Fig. 6d), mostly
species of Echinometra, Anthocidaris, Heterocentrotus, Heliocidaris, Echinothrix, Tripneustes,
and Centrostephanus (Suzuki 1970, Banner and
Banner 1973), and at least 2 species exhibit
protandric hermaphroditism (Suzuki 1970,
Gherardi and Calloni 1993), which explains the
presence of an appendix masculina in some
ovigerous specimens. Within Athanas, only Ath.
granti Coutière, 1908 occasionally associates with
sea urchins of the genus Centrostephanus
(Banner and Banner 1973). Remarkably, this
species shows some resemblance to Arete, but
differs in many other respects and clearly belongs
to Athanas (see below). Protandric hermaphroditism has yet to be documented in Athanas,
although it is suspected in Ath. ornithorhynchus
Banner and Banner, 1973, a remarkable species
associated with brittle stars (Marin et al. 2005).
As already mentioned, Arete requires revision
at the species level. The taxonomic status of de
,
Man s“Arete maruteensis salibabuensis”placed
in synonymy of Are. dorsalis, as well as the taxonomic statuses of Are. iphianassa, Are. intermedius, and Are. kominatoensis (originally
described as Ath. kominatoensis), placed in synonymy with Are. indicus (Banner and Banner
1973), should be reconsidered. All these forms
should be contrasted to 2 species misidentified as
Are. indicus and Are. dorsalis by Suzuki (1970),
and which probably represent undescribed species
(K. Nomura, pers. comm.). Therefore, many of the
previous identifications of Arete species (e.g.,
Banner and Banner 1960 1973, Miya and Miyake
1968, Suzuki 1970, Bruce 1989 1990a), including
,
Bruce s (1990a) redescription of Are. dorsalis, are
questionable. As such a key to the genus Arete is
considered premature.
Athanas Leach, 1814 sensu stricto
Athanas Leach 1814: 401.
Diagnosis: Body usually slender. Carapace
usually smooth, sometimes setose. Frontal margin
with long, straight, slightly ascendant, or descendant rostrum, with acute tip, without subdistal tooth
on ventral margin, rarely with teeth on dorsal margin. Extra-corneal teeth present, acute, sometimes protruding beyond anterior margin of eye;
468
Zoological Studies 46(4): 454-472 (2007)
supra- and infra-corneal teeth absent or present.
Orbital hoods absent; eyes exposed in dorsal and
lateral views. Pterygostomial margin usually
rounded, rarely sharply protruding or with small
acute tooth. Cardiac notch well-developed. Sixth
abdominal segment with articulated plate at posteroventral angle; preanal plate rounded.
Antennules with straight, not serrated distal margin
of 1st segment; ventromesial carina of 1st segment with strong tooth; lateral flagellum with welldeveloped secondary ramus. Antenna with normal, not particularly stout basicerite, distolateral
tooth present; scaphocerite variably oval to subrectangular, usually more or less elongate.
Mandible with palp, incisor process usually not
expanded, distally with 5-8 medium-sized teeth,
rarely expande, with 12-15 min teeth. Maxillule
with bilobed palp, both ventral and dorsal lobes
with setae. Labrum not swollen or protruding.
Third maxilliped without distal tooth on dorsal margin of antepenultimate segment; penultimate segment elongate, distinctly longer than wide; ultimate
segment often with spines on tip. First pereiopods
(chelipeds) highly variable in shape, size, and
degree of asymmetry, often sexually dimorphic or
polymorphic, carried folded or extended with
dactylus in lateral position; coxa usually with
apressed subtriangular tooth mesially; basis with
rudimentary exopod; ischium unarmed mesially,
often with spines on dorsal and ventral margins;
chelae without linea impressa on palm and without
fossa-plunger on fingers. Male chelipeds usually
enlarged and/or elongate, equal, subequal, or
unequal, symmetrical, subsymmetrical, or asymmetrical (with major cheliped situated either on left
or right side); ischium sometimes with lobes furnished with spines on dorsal margin; merus usually stout, depressed or excavated ventrally; carpus
elongate or cup-shaped, sometimes flattened ventrally; chela highly variable, usually conspicuously
swollen or elongate, sometimes with tubercles
along ventral margin; fingers usually armed with
teeth. Female chelipeds variable from slender,
slightly elongate, to greatly enlarged, equal, subequal, or unequal, symmetrical, subsymmetrical, or
asymmetrical (with major cheliped situated on left
or right side); merus variable, slender to stout, flattened or excavated ventrally; carpus elongate or
cup-shaped, sometimes flattened ventrally; chelae
variable from slender to oval or elongate, sometimes with tubercles along ventral margin; fingers
unarmed or armed with teeth. Carpus of 2nd
pereiopod with 5 segments, exceptionally 4 or 6.
Third pereiopod with ischium unarmed or bearing 1
spine on ventrolateral margin; merus unarmed,
distoventral margin never acute or angular; carpus
unarmed; propodus usually with ventral spines,
rarely with spine-like setae; dactylus more or less
slender, simple or biunguiculate. Fifth pereiopod
with well-developed propodal brush. Second pleopod with appendix interna and appendix masculina
in males, appendix interna in females, exceptionally with appendix masculina in ovigerous specimens. Telson with 2 pairs of dorsal spines and 2
pairs of posterolateral spines; anal tubercles
absent. Gill formula with somewhat variable number of epipods, as summarized in following table
(untypical condition indicated in parentheses).
Pl
Ar
Pd
Ma
Se
Ex
Mxp1
Mxp2
Mxp3
P1
P2
P3
P4
P5
+
+
+
+
+
+
+
r
+
+
+
r
+
+(-)
+
-
+
-(+)
+(-)
-
+
-(+)
-
Type species: Athanas nitescens Leach, 1814
[Palaemon nitescens Leach 1814: 401]; type locality: England. Most important synonyms: Palaemon
laevirhincus Risso 1816: 108; Athanas var. laevirhincus (Risso, 1816), Holthuis and Gottlieb
1958: 32; Arete diocletiana Heller 1862: 404;
Athanas transitans Czerniawsky 1884: 25;
Athanas nitescens var. suchumicae Czerniawsky
1884: 24; Athanas nitescens forma rotundicauda
Czerniawsky 1884: 24; Athanas transitans var.
longispina Czerniawsky 1884: 25; Athanas transitans var. pontica Czerniawsky 1884: 26; Athanas
veloculus Bate 1888: 529. The taxonomic statuses of Ath. laevirhincus and Ath. veloculus requires
confirmation (see below).
Other species included: Athanas includes all
the remaining species described mostly under the
generic name Athanas.
Athanas amazone Holthuis 1951: 111; type
locality: Nigeria.
Athanas anatidactylus Anker and Marin 2007:
163; type locality: Vietnam.
Athanas areteformis Coutière 1903: 79; type
locality: Hulule Male Atoll, Maldives. Synonyms:
Athanas naifaroensis Coutière 1903: 77; Athanas
erythraeus Ramadan 1936: 13; Athanas dubius
Banner 1956: 322 (see Banner and Banner 1973).
The taxonomic statuses of Ath. naifaroensis, Ath.
erythraeus and Ath. dubius require confirmation.
Athanas crosslandi Tattersall 1921: 372; type
Anker and Jeng -- New alpheid genus with redefinition of Athanas and Arete
locality: Khor Dongonab, Sudanese Red Sea.
Athanas dentirostris Anker, Jeng and Chan
2001: 1049; type locality: Haiphong, Vietnam.
Athanas dimorphus Ortmann 1894: 12; type
locality: Dar es Salaam, Tanzania. Synonyms:
Alpheus monoceros (Heller 1862: 274, nomen
dubium); Athanas setoensis Kubo 1951: 265;
Athanas dimorphus seedang Banner and Banner
1966b: 28 (see Banner and Banner 1960 1973).
The taxonomic statuses of Ath. setoensis and Ath.
dimorphus seedang require confirmation.
Athanas djiboutensis Coutière 1897: 233;
type locality: Djibouti. Synonym: Athanas sulcatipes Borradaile 1898: 1011 (see Banner and
Banner 1960 1973).
Athanas esakii Kubo 1940: 93; type locality:
“ Kusaie”, possibly Kosrae, Caroline Is.,
Micronesia.
Athanas gracilipes Banner and Banner 1978:
234; type locality: South China Sea.
Athanas gracilis Boone 1935: 122; type locality: Raiatea, Society Is., French Polynesia.
Athanas granti Coutière 1908: 192; type locality: Adelaide, South Australia.
Athanas grimaldii Coutière 1911: 1; type locality: not designated, type specimens from Bay of
Biscay, France and Cape Verde Is.
Athanas haswelli Coutière 1908: 192 (amended from the original spelling Ath. hasswelli by
Banner and Banner 1973); type locality: Adelaide,
South Australia.
Athanas hongkongensis Bruce 1990b: 624;
type locality: Hong Kong, China.
Athanas japonicus Kubo 1936: 43; type locality: Yamaguchi, Japan. Synonyms: Athanas lamellifer Kubo 1940: 102 (see Miya and Miyake 1968).
The taxonomic status of Ath. lamellifer needs clarification.
Athanas jedanensis de Man 1910: 313; type
locality: Pulau Djedan, eastern Indonesia.
Athanas locincertus Banner and Banner
1973: 311; type locality:“Panchoran Buoy”, possibly Western Australia.
Athanas marshallensis Chace 1955: 17; type
locality: Marshall Is.
Athanas minikoensis Coutière 1903: 76; type
locality: Minikoy Atoll, Laccadives, India.
Athanas naga Banner and Banner 1966b: 26;
type locality: Gulf of Thailand.
Athanas nouvelae Holthuis 1951: 104; type
locality: Cape Verde Is.
Athanas ohsimai Yokoya 1936: 129; type
locality: Sagami Bay, Japan.
Athanas orientalis Pearson 1905: 88; type
469
locality: Gulf of Manaar, Sri Lanka.
Athanas ornithorhynchus Banner and Banner
1973: 319; type locality: Northern Territory,
Australia.
Athanas parvus de Man 1910: 315; type locality: Timor, Indonesia. Synonym: Athanas sibogae
de Man 1910: 314 (see Banner and Banner 1973,
Chace 1988).
Athanas phyllocheles Banner and Banner
1983: 152; type locality: off La Réunion, Indian
Ocean.
Athanas polymorphus Kemp 1915: 295; type
locality: Chilka Lake, eastern India.
Athanas rhothionastes Banner and Banner
1960: 142; type locality: Canton, Phoenix Is.,
Kiribati.
Athanas squillophilus Hayashi 2002: 396;
type locality: southern Hokkaido, Japan.
Athanas stebbingi de Man 1920: 106; type
locality: Pulau Bawean, Indonesia.
Athanas tenuipes de Man 1910: 316; type
locality: Sulawesi, Indonesia.
Athanas sp. nov. 1 aff. dimorphus (A. Anker
pers. obs.), Pulau Bintan, Indonesia.
Athanas sp. nov. 2 aff. parvus (A. Anker pers.
obs.), Vietnam.
Athanas sp. nov. 3 aff. amazone (Anker and
Ahyong in press), Ivory Coast.
Athanas sp. nov. 4 aff. phyllocheles (Anker
and Ahyong in press), New South Wales,
Australia.
Distribution: Indo-West Pacific from the Red
Sea to South Africa, Australia, French Polynesia,
and Japan; eastern Atlantic from southern Norway
and Ireland to southeastern Africa, including the
Mediterranean and Black Seas (absent from central and western Atlantic and eastern and northcentral Pacific).
Remarks: Athanas, as redefined here, differs
from Rugathanas and Arete in several morphological features (see descriptions of Rugathanas and
Arete above). The presence of a subtriangular
projection on the mesial face of the cheliped coxa,
a previously unconsidered feature, may turn out to
be a further diagnostic feature of Athanas. This
projection was present in all 12 personally examined species of Athanas (A. Anker pers. obs.),
including A. dimorphus, A. nitescens, and A. areteformis (Fig. 8g), but is absent in all species of
Arete and Rugathanas.
With over 30 species, Athanas remains a relatively heterogeneous genus. It was subdivided
into 2 informal species groups by Coutière (1899),
the Ath. nitescens group (chelipeds carried extend-
470
Zoological Studies 46(4): 454-472 (2007)
ed) and the Ath. dimorphus group (chelipeds carried folded). The Ath. nitescens group appears to
be relatively homogenous, except for the somewhat aberrant Ath. areteformis and Ath. granti.
However, these 2 species clearly belong to the
Ath. nitescens group based on the features of the
chelipeds (see below). The Ath. dimorphus group
is much more heterogeneous and may be further
subdivided into several smaller groups mainly
defined by the features of the chelipeds, frontal
margin, and walking legs (A. Anker pers. obs.).
However, the complex intrageneric structure of
Athanas is beyond the scope of this study and will
be examined elsewhere.
The placement of Ath. areteformis within the
Ath. nitescens group is based mainly on the features of the male chelipeds. The shape of the
frontal margin of the carapace (Figs. 8a, b) and the
expanded incisor process of the mandible (Figs.
8c, d) of this species are superficially similar to
those of Rugathanas, but the chelipeds (Figs. 8ej), in particular the stout major chela (Fig. 8f),
greatly differ from the chelipeds of Rugathanas,
and more closely resemble those of Ath. grimaldii
(Fig. 9a) or Are. indicus (Fig. 7c). The specific
name Ath. areteformis (resembling Arete) given by
Coutière (1903) refers to the general resemblance
of the chelipeds of this species to the chelipeds of
Arete. Banner and Banner (1960) misinterpreted
,
this as Coutière s doubts about the distinction
between Arete and Athanas. Despite some similarities with Rugathanas and Arete, Ath. areteformis plainly belongs to the genus Athanas, as
redefined above, because of the general shape of
the chelipeds, the non-extensible dactylus of the
3rd-5th pereiopods, the well-developed row of
setae on the propodus of the 5th pereiopod, as
well as the presence of 3 strap-like epipods on the
pereiopods (P1-3), a typical condition in Athanas.
Another species that shows some morphological and ecological resemblance to Arete is Ath.
granti. This species also has a robust major cheliped (Fig. 9b), stout biunguiculate dactylus on the
3rd-5th pereiopods, and is furthermore, facultatively associated with the sea urchin Centrostephanus
rodgersii (Agassiz, 1863) (Banner and Banner
1973). However, the shape of the frontal margin;
the marked asymmetry of the chelipeds (the minor
cheliped being much slenderer, see Banner and
Banner 1973); the 5-segmented carpus of the 2nd
pereiopod; the number of pereiopodal epipods;
and the absence of tooth on the mesial face on the
cheliped ischium, all indicate that Ath. granti is a
member of Athanas. Furthermore, in none of the
species of the Ath. nitescens group, including Ath.
nitescens (Figs. 9c, d), Ath. grimaldii (Fig. 9a), Ath.
aretefromis (Fig. 8f), and Ath. granti (Fig. 9b), does
the palm of the chela reach the same broadness
as in Arete (Fig. 7). Banner and Banner (1973)
reported the presence of a median flap on the 5th
abdominal sternite in Ath. granti and Are. sp. cf.
dorsalis. Interestingly, this flap was absent in the
closely related Are. sp. cf. indicus (both Are. dorsalis and Are. indicus were probably misidentified
by Banner and Banner (1973), see above). The
function of this odd flap is unknown; it may have
evolved independently in some Arete species and
in Ath. granti, and perhaps plays a role in the symbiosis with the sea urchins. On the other hand, it
is also possible that the Arete clade evolved from
ancestors within Athanas, in which case the latter
genus would be paraphyletic and require further
splitting. The morphological complexity of Athanas
and the absence of a phylogeny of the Athanas
complex (based on molecular and/or morphological characters) make further conclusions impossible.
Acknowledgments: The 1st author (AA) is indebted to Dr. A. Richard Palmer (University of Alberta,
Edmonton, Canada) for his support in form of an
NSERC operating grant (A7245). Mr. Gavin Dally
(Museum and Art Gallery of the Northern Territory,
Darwin, NT, Australia) arranged the loan of the
NTM specimens. Mr. Keiichi Nomura (Kushimoto
Marine Park Center, Japan) sent us additional
specimens from Japan. Dr. Hung-Chang Liu
(Department of Ecology, Providence University,
Shalu, Taiwan), Dr. Masako Mitsuhashi (Osaka
Institute of Technology, Osaka, Japan), and Mr.
Chia-Wei Lin (National Taiwan Ocean University,
Keelung, Taiwan) helped collect alpheid specimens in Kenting. Madoka Itoh (Japan), Pierre
Noël (MNHN, Paris, France), and Neville Coleman
(Australia) provided colour photographs. Dr.
Sammy De Grave (Oxford University Museum of
Natural History, Oxford, UK), made useful comments on an earlier draft of the manuscript, while
Dr. Peter C. Dworschak (Naturhistorisches
Museum in Wien, Vienna, Austria) and an anonymous colleague reviewed the manuscript and
made further valuable corrections and suggestions.
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