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what are mollusca?

they are soft bodied animals that have an internal and an external shell

what is the Mollusca body plan?

it consists of the foot, shell, mantle and the visceral mass

Mollusca visceral mass

the visceral mass contains the heart, digestive and excretory organs

Mollusca foot

it is a flat soft and muscular surface that contains a mouth. It is also involved in locomotion

Mollusca mantle

it is the layer that covers the visceral mass. It also secrets a limestone shell

Mollusca shell

it is the protective layer of calcium carbonate secreted from the mantle

How are Mollusca classified

they are classified based on the type of foot and shell they have. They are classified as either gastropods, bivalves and Cephalopoda

class gastrapoda characteristics

they have stomach-foot. body is coiled. mouth with radula, foot is large and flat

examples of class gastrapoda

snails and slugs

class bibalba characteristics

they have an enclosed body. have no head. wedge shaped foot

examples of bibalba

clams

class cephalopoda characteristics

Cephalopods have bilateral body symmetry, a prominent head, and a set of arms or tentacles

examples of cephalopoda

Squids, octopuses, nautilus, and ammonites