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Chapter 16
Mollusc
8
Biology
Undergraduate 3
03/20/2012

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Term
Class Caudofoveta
Definition
  • about 120 species
  • wormlike marine organs
Term
Class Solenogastres
Definition
  • about 250 speices
  • no radula
  • no gills bottom dwellers
Term
Class Monoplacophora
Definition
  • begin in the paleozonic era
  • long thought to be extinct
  • lives on ocean floor
  • rounded shell
Term
Class of Polyplacophora
Definition
  • about 1000 species known
  • chitons
  • bear 7 or 8 limy plates on dorsal side
  • usually found in rocky parts
Term
Class Scaphopoda
Definition
  • about 900 living species
  • tusk shells
  • benthic marine species
Term
Class Gastropoda
Definition
  • largest group with about 7,000 living species
  • snails limpets slugs whelks conchs periwinkles sea hares
  • usually sluggish snail like
  • development in larva, the mouth is anterior to anus but during development the relative positions change
  • coiling or spiral winding of shell happens
Term
Class Bivalvia
Definition
  • the "hachet footed" animals
  • mussles clams scallops
  • they have 2 shells "bivalvia"
  • many are sedentary filter feeder
  • lack radula & show little cephalization (concentration of nervous system and sense organs in head region)
Term
Class Cephalopoda
Definition
  • the head foot molluscs
  • molluscs squid octopi devil fish
  • modified foot concetrated in head region; anterior margin of foot forms arms or tentacles
  • all marine
  • shell made light by a series of gas chambers
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