Notes on Mollusca - Basic Facts 1 >110,000 described...

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Basic Facts 1. >110,000 described species 2. 0.5mm-21m(giant squid) 3. Primitively marine, but many terrestrial 4. Eucoelmate 5. Protostome Mollusca are part of the Lophotrochophora Marine mollusks develop through a trochophore larval stage Classification 1. Polyplacophora(chitons) 2. Gastropoda (snails) 3. Bivalvia (clams, oysters) 4. Cephalopoda (squids, octopus) Body Plan Traits (study diagram on pg. 3) 1. Subdivision into three body regions: head, visceral mass (visceral, excretory and reproductive), foot (movement) –study diagram on pg. 4
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Unformatted text preview: • 2. head 1. contain the radula (except for bivalves), rasping, tongue like organ used for feeding • 3. Visceral mass includes visceral, excretory, and reproductive organs • 4. Mantle: outer protective tissue fold that MAY secrete a hard proteinaceous or mineral shell • 5. Foot: muscular ventral organ that facilitates substrate contact (Gastropoda) but can be modified into tentacles (Cephalopoda) or “water wings” (marine Gastropoda)....
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  • Spring '10
  • Kant
  • Cephalopoda, mass (visceral,

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