Phylum Mollusca (molluscs) 2009.pdf - Trochozoa coelomate...

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Trochozoa : coelomate protostomes w/ trochophore larva Mollusca (gk. molluscus = soft) Radula (rasping tongue) 1. Ctenidium 2. Mantle covering visceral mass 3. Muscular foot 4. Hemocoel and pericardial cavity 5. Nephridial excretory system 6. Molluscan shell not a defining characteristic although it contributed to the diversification of the phylum Classes of Mollusca Neomeniomorpha Chaetodermomorpha Vermiform bodies Spiculate Polyplacophora 8 dorsal plates Monoplacophora Single shell Serial replication of gills and kidneys Scaphopoda Tubular shell Captacula, no ctenidia Bivalvia 2 lateral shell valves No radula Gastropoda Single or no shell Torsion Cephalopoda Siphon and tentacles Closed circulatory system Well-developed nervous system Often reduced shell Trochophore larva Pasted from < spiralians.php > Generalized molluscan body plan Pasted from < >
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