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Transcript of Phylum Mollusca
The type of shell and foot are used to group mollusks into classes.
Four body parts
shell - made of CaCO3 secreted by glands in the mantle.
mantle - thin tissue covering the body. Secretes the shell.
muscular foot - contains mouth and other feeding parts. May be adapted for crawling, burrowing, or as tentacles.
visceral mass - contains internal organs
Most have one or two shells
Mantle - produces the shell
Produce a larva called a trochophore
Life Processes Feeding
carnivores - cephalopods, Florida cone shell has poisonous darts
herbivores - snails and slugs use radula
filter feeders - bivalves use gills to filter plankton from water.detritus feeders, parasites Respiration
Aquatic mollusks use gills
Land mollusks use adapted mantle cavity lined with blood vessels. "skin breathing".
Response Sessile and burrowing members are simple with nerve ganglions, a few nerve cords, and simple sense organs.
Cephalopods have a well developed brain (See food experiments). Can be trained chemical and touch receptors
ocelli (eye spots)
Complex sense organs. Eye structure similar to humans. (Cephaloposds)
Reproduction Most have separate sexes and external fertilization.
In tentacled mollusks and some snails fertilization is internal.
Some snails are hermaphroditic and engage in cross fertilization.
Hermaphroditic oysters can switch sex from male to female and vice-versa