lecture_11_17_2_Mollusca

lecture_11_17_2_Mollusca - Protostomes 1: M o llu s c a No...

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Protostomes 1: Mollusca
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Hox genes? No symmetry, 1 cell layer Motile Multicellular Heterotroph
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The Lophotrochozoans (not a term you need to know!)
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Mollusca features: Trochophore larva This larval form is shared with Annelida, and indicates a close relationship between the two phyla.
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The molluscan life- cycle, including the trochophore and the and veliger) larval stages. Juvenile
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Generalized mollusca Mantle
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Generalized mollusca Mantle Shell
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Generalized mollusca Head Foot Mantle Shell
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Generalized mollusca Head Foot Mantle Shell Mouth Anus
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Radula: rasping organ for feeding
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The molluscan radula Individual radula teeth
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Four major molluscan groups Polyplacophora (Chitons) 1,000 species Bivalvia (Clams) 25,000 sp species Gastropoda (Snails) 70,000 species Cephalopoda (Squids and Octopus) 1,000 species
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Polyplacophora- chitons -Flattened, multi-plated (7-8 plates) animals. -Small (2-30 cm long), intertidal grazers. -Very large, muscular foot, strong radula for grazing algae.
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lecture_11_17_2_Mollusca - Protostomes 1: M o llu s c a No...

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