PHYLUM MOLLUSCA PHYLUM MOLLUSCA Coelomates Tridacna gigas Tridacna

PHYLUM MOLLUSCA

PHYLUM MOLLUSCA Coelomates Tridacna gigas Tridacna squamosa

PHYLUM MOLLUSCA Soft Bodied Shelled Some without Cephalization Sensory organs Mouths Body Plan Visceral Mass Head-Foot Mantle Tonicella lineata

PHYLUM MOLLUSCA Complete digestive tract Digestive glands Specialized feeding structures Circulatory system Heart (2 chambers) Open system in most groups Closed in cephalopods Octopus briareus

PHYLUM MOLLUSCA Advanced nervous system Brain Sensory organs Eyes Sensory papillae Excretory system Kidney-like nephridia Reproduction Some hermaphroditic Some have genders

MOLLUSC TAXONOMY Gastropoda – snails, slugs Cephalopoda – octopi, squid Bivalvia – clams, oysters, scallops

Atlantic triton’s trumpet (Charonia variegata) MOLLUSC TAXONOMY Gastropoda Tiger cowrie (Cypraea tigris)

Spotted sea hare (Aplysia dactylomela) MOLLUSC TAXONOMY Gastropoda) zebra sea goddess (Hypselodoris zebra) Phidiana hiltoni

Helminthoglypta walkeriana MOLLUSC TAXONOMY Gastropoda Giant banana slug (Ariolimax columbians)

Giant cuttlefish (Sepia latimanus) MOLLUSC TAXONOMY Cephalopoda Octopus, squid, nautilus Octopus sp Nautilus sp

SQUID ARE THE LARGEST CEPHALOPODS

MOLLUSC TAXONOMY Bay scallop (Aequipecten irradians) Bivalvia Clams, oysters, mussels, scallops Edible mussels (Mytilus edulis) Ostrea edulis

ADULT ABALONE

PHYLUM MOLLUSCA, CLASS BILVALIA

GENERALIZED BIVALVE ANATOMY

BIVALVES ARE TYPICALLY FILTER FEEDERS

BIVALVE LIFE CYCLE