1. Snails
November 16, 2009 Volume VII
Transportation Inside and Through the breathing
Out holes (aka pneumostome)
oxygen reaches the snails
Inside: lungs.
The inside blood
circulation system of a Outside:
snail is vein less. It is A snail moves by sliding
open with blood spaces. on mucus that is produced
Haemocyanin is a colorless from a foot which is found
pigment which contains under the body of a snail.
copper. A snail’s heart is The muscles in the foot
relatively weak. It contract and expand which
consists of a single thick creates a kind of rippling
walled ventricle and a movement which pushes the
single thin walled snail forward. The
auricle. The blood takes movement with the mucus
the oxygen from the lungs makes a sliding track so
and spreads it to the the snail can move faster.
auricle and the ventricle. The mucus leaves behind a
The ventricle releases the silvery
blood with oxygen into the
arteries, and after that
to the tissues. The
tissues take oxygen and
food and excrete waste
products. Then the blood
flows back to the heart
using blood spaces.
On the inside of the
visceral-sac lays the lung
(aka pulmonary cavity). 1
2. track which move on sharp objects with
can out getting hurt.
sometimes
be found in Extinct or Endangered
gardens. Molluscs Asia
The slime
* Gastrocopta chichijimana
comes out
(Terrestrial snail from Japan)
of the front of the foot * Gastrocopta ogasawarana
and when it comes in (Terrestrial snail from Japan)
contact with air it * Hirasea planulata
hardens. The mucus is so (Terrestrial snail from Japan)
tough that a snail can * Lamellid
monodonta spiritus Land Megalobulimus
(Terrestrial snail snail, Recent cardosoi
from Japan) * Placostylus (Terrestrial snail
* Lamellidea ambagiosus worthyi from Brazil)
nakadai Zealand Land snail, Recent Extinct: 50
species
* Placostylus Molluscs South
ambagiosus America Extinct in the
gardneri Land Wild: 11 species,
snail, Recent * Littoridina including Partula
* Placostylus gaudichaudii dentifera, Partula
ambagiosus hinemoa (Freshwater snail faba, Partula
Land snail, Recent from Ecuador) garretti, Partula
* Placostylus * Tomigerus hebe, Partula
ambagiosus gibberulus labrusca, Partula
lesleyae Land (Terrestrial snail mirabilis, Partula
snail, Recent from Brazil) mooreana, Partula
* Placostylus * Tomigerus suturalis, Partula
ambagiosus priscus turbinatus tohiveana, Partula
Land snail, Recent (Terrestrial snail tristis
* Placostylus from Brazil)
ambagiosus *
2
3. Critically the giant appreciable
Endangered: 18 African snail. amounts of heat
species, including internally. In
Partula calypso,
Partula clara, desert
Partula emersoni, Over Time conditions and
Partula filosa, full sun, they
Partula gibba, Over time the can survive
Partula guamensis, Gastropods tens of degrees
Partula hyalina, first appeared hotter than the
Partula langfordi, in the second air but will
Partula leucothoe,
Partula half of the not survive for
martensiana, Dolgellian Age. long.
Partula They evolved in A body of a
otaheitana, through out snail consists
Partula radiolata, history since of the snails
Partula rosea, then. A snail head, neck,
Partula thetis, all through visceral hump,
Partula varia
history has tail, and foot.
Endangered: 7 been at the On the head is
species bottom of the two pairs of
food chain. tentacles.
Some of its There are a
predators large pair on
Symmetry and include ground top of it’s
Others beetles, head, which is
snakes, toads, where the eyes
The symmetry of turtles, and are, and the
the snail is birds (like lower pair of
bilateral. If chickens, tentacles on
the snail had ducks, and the lower part
the shell on geese). Another of the head. A
then it would predator would snails mouth is
be asymmetry. be a predatory under the lower
Other organisms caterpillar! tentacles. The
in the visceral hump,
Gastropod group Regulation and which contains
would be the General the internal
slug. A couple Structure organs, is
of odd snails found in the
would be the Snails are cold shell.
apple snail and blooded and do
not generate
3
4. The visceral is one of the
hump, which reasons farmers
contains the and people get
internal upset.
organs, is
found in the
shell. The foot
is under the Reproduction
mantle and
holds the Snails sexually
muscles for the reproduce. You
snail to move. can not tell a
male or a
female snail
What’s For apart by the
Dinner? color or shape
of the shell.
Most land But in some
snails eat cases you can
plant and other tell the
vegetation. difference by
Snails eat the size of the
decaying and shell.
living plants.
They also eat
fruits, plant
bark, and
algae. A snail
has a radula in
its mouth for
grinding up its
food. A radula
is like a rough
tongue, like a
file with rows
of small teeth.
It scrapes off
leaves and
flowers to eat.
Snails can also
gnaw through
limestone. That
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