Phylum Mollusca Phylum Mollusca n Coelomates Tridacna gigas

Phylum Mollusca

Phylum Mollusca n Coelomates Tridacna gigas Tridacna squamosa

Phylum Mollusca n Shell n n Some without external Cephalization Sensory organs n Mouths n n Soft body with 3 Body Divisions Visceral Mass n Head-Foot n Mantle n Tonicella lineata

Phylum Mollusca Complete digestive tract n Digestive glands n Specialized feeding structures n Circulatory system n Octopus briareus Heart (2 chambers) n Open system in most groups n Closed in cephalopods n n Coelom restricted to pericardium in most cases

Phylum Mollusca n Advanced nervous system Brain n Sensory organs n n Eyes (simple and camera) n Excretory system n n Kidney-like nephridia Reproduction Monoecious and dioecious n External development n External & internal n

Mollusc Taxonomy n Major classes n Polyplacophora n Chitons Chiton tuberculatus lives in the rocky intertidal zones eat algae with its radula 8 shell plates

Mollusc Taxonomy n Atlantic triton’s trumpet (Charonia variegata) Major classes n Gastropoda n Subclasses: n Prosobranchi a n Shelled marine gastropods Tiger cowrie (Cypraea tigris)

Mollusc Taxonomy n Spotted sea hare (Aplysia dactylomela Major classes n Gastropoda n Subclasses: n Opisthobranc hia n Sea slugs (marine) Phidiana hiltoni zebra sea goddess (Hypselodoris zebra)

Mollusc Taxonomy n Helminthoglypta walkeriana Major classes n Gastropoda n Subclasses: n Pulmonata n Terrestrial snails/slugs n Freshwater snails Giant banana slug (Ariolimax columbians)

Mollusc Taxonomy n Major classes Bay scallop (Aequipecten irradians) n Bivalvia n Clams, oysters, mussels, scallops Edible mussels (Mytilus edulis) Ostrea edulis

Mollusc Taxonomy n Giant cuttlefish (Sepia latimanus) Major classes n Cephalopoda n Octopus, squid, nautilus Octopus sp Nautilus sp

Mollusc Taxonomy n Major classes Polyplacophora n Gastropoda n Bivalvia n Cephalopoda n n Minor classes Monoplacophora n Solenogastres n Caudofoveata n

Generalized Mollusc Anatomy