Heterocentrotus mamillatus

Slate pencil urchin | Heterocentrotus mammillatus
Heterocentrotus mamillatus
Heterocentrotus mamillatus, Kenn Reef, Queensland, Photo: Graham Edgar
Heterocentrotus mamillatus
Heterocentrotus mamillatus, Lord Howe Is, NSW, Photo: Andrew Green
Heterocentrotus mamillatus
Heterocentrotus mamillatus, Hawaii, Photo: Rick Stuart-Smith
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Heterocentrotus mamillatus
Heterocentrotus mamillatus
Heterocentrotus mamillatus

Distribution

Tropical Indo-Pacific


Description

Distinctive red, blunt spines. Usually well concealed deep in reef crevices during the day, with only a small portion visible.


Information

Max Size: N/A cm

Sea Temperature Range: N/A

Depth: N/A

Habitat Generalization Index: N/A

Also referred to as the SGI (Species Generalisation Index), this describes the habitat niche breadth of the species. Species with values less than 15 are found in a relatively narrow range of reef habitat types (specialists), while those over 25 may be found on most hard substrates within their range (generalists). Learn more here.


Conservation and Rarity

IUCN Status: Not Evaluated

Occurrence: Infrequent (2.2% of sites)

Occurrence describes how often the species is found on surveys within its distribution. It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed

Abundance: Few (3 per transect)

Abundance is calculated as the average number of individuals recorded per RLS transect, where present.