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Mollusca

Across
Class in Mollusca that contains the most intelligent invertebrates
Sea slugs, gastropods that lack shells
Counterclockwise 180° twisting of the head and foot relative to the rest of the body
Threads used by mussels to attach as epifauna
Class in Mollusca with the highest species and diversity
Free swimming mollusk larva
Down
A shell that coils to one side
Chitinous rasplike feeding device
Tube for drawing water in bivalves
Class in Mollusca with tusk or tooth shells
Class also called chitons
Dominant eating method in Bivalvia
Oldest part of the bivalve shell
"naked gill"
Class with a two valved shell and a laterally compressed body
Encloses visceral mass where internal organs are located
Protein disk that seals the shell opening in gastropods