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Phylum: MOLLUSCA

Structure, characteristics,Essential life functions

QuestionAnswer
What are some characteristics of MOLLUSCA? Mainly aquatic, some are terrestrial. Soft bodies
What type of symmetry do they have? They have bilateral symmetry
Is a Coelom present? How many germ layers? They are true coelomates with three germ layers
Is Cephalization present? Present in most classes except Bivalves
What is the "foot" used for in MOLLUSCA Its a muscle mainly for locomotion. Cephalopods use arms and tentacles.
Describe what a Mantle is. Its a thin tissue layer around organs, sometimes used as shell.
Describe what a Visceral mass is. the soft, non-muscular metabolic region of the mollusc that contains the body organs
Describe what the shell is used for Used for protection, can be internal or external. Absent or reduced in some.
What type of digestive system do they have? Complete digestive system with Mouth and Anus
What are some classes of MOLLUSCA Bivalva: clams, oysters, mussles. Gastropoda: snails, abalone. Cephalopoda: squid, octopus, cuttlefish.
What type of circulation system do they have? The have chambered hearts. Sessile Molluscs have open circulation, blood bathes the tissue. Fast moving Molluscs have closed circulatory system.
How do they Respire? Gas exchange through gills in mantle. If terrestrial Mollusca (snail/slugs) use diffusion with membrane around mantle
What type of nervous system do Bivalves and Gastropods have? Ganglia, nerve cord, simple eyes
what type of nervous system do Cephalopods have? Developed brain, complex nervous system, eyes for sight.
What does reproduction look like in Mollusca snails + slugs = hermaphodites. Terrestrial Mollusca + cephalopods = interanl fertilization. All Mollusca have larve called trochophore. *some oysters can change gender
Unique characteristics of class Bivalve Some make pearls, they have 2 powerful muscles for swimming
Unique characteristics of class Gastropoda Terrestrial produce slim for foot to help move, they have eyes on stalks
Unique characteristics of class Cephalopoda Eight arm with up to 90 suckers, 2 feeding tentacles, have a siphon for propulsion, internal shell (pen), produce ink from sack.
Created by: chloe_well
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