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Ch. 38 Mollusca
Definitions and descriptions
8
Biology
Undergraduate 1
04/08/2008

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Term
Protosomes
Definition

Phylum Mollusca, Annelida, and Arthropoda

 

Characteristics include: Developed nervous, digestive and reproductive systems.  

Term
Deuterosomes
Definition
Phyla: Echinodermata, Hemichordata, and Chordata


Term

Phylum Mollusca

(General Characteristics) 

Definition
  • Snails
  • Clams
  • Octopus
  • Squids
Char:
  • Soft-bodied
  • Mantle: Specialized later of epidermal cell (shell)
  • Coelmate
  • Open Circulatory system
  • Little segmentation
  • Body Plan:
    • Viscernal mass: Organ system
    • Foot
    • Ca based shell
    • Mantle, May aid in respiratory and movement in some species. 
 
 
 
Term

Class Polyplacophora

 

[image]

Definition
  • Phylum Mollusca
  • Marine
  • Radula- Horny-toothed organ in the mouth that scrapes food to eat.
Term

Class Gastropoda

gastro (stomach) poda(foot) 

 

Definition
  • Phylum Mollusca
    • snails
    • marine ndibranchs
    • garden slug
  • No shells
  • Radula-teeth
Term

Class Bivalvia

Bi(two) valve( door or shell) 

Definition
  • Phylum Mollusca
  • Genus: Anodonta (clam)
    • Clams
    • Oysters
    • Scallops
    • Mussels
Term

Class Cepholpoda

(cephalo-head, poda-foot) 

Definition
  • Phylum Mollusca
  • Genus:Loligo
    • Squid
    • Octopus
    • Nautilus
    • Cuttlefish
  • Predatory
  • Unique characteristic: Closed Circulatory system
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