Mollusc1

Mollusc1 - MOLLUSCS Phylum Mollusca Subphylum Amphineura...

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MOLLUSCS
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Phylum Mollusca Subphylum Amphineura Class Polyplacophora – chitins Subphylum Cyrtosoma Class Monoplacophora – almost extinct Class Gastropoda – snails Class Cephalopoda – squid, nautilus Subphylum Diasoma Class Rostroconchia – Camb-Perm Class Bivalvia – clams, oysters Class Scaphopods – tusk shells All major groups (ex scaphopods) appear in Cambrian, became important part of Mesozoic/Cenozoic faunas
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Common features unsegmented body – bilaterally symmetrical head (most) - contains sensory organs radula - with primarily organic teeth foot – crawling, burrowing, or grasping mantle – fleshy covering which secretes shell shell (when present) periostracum/calcareous prismatic layer/nacreous layer gills – in chamber in mantle Phylogeny poorly understood
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H.A.M. Hypothetical Ancestral Mollusc
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Diasoma “through body” Cyrtosoma “curved body” rostroconchs
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Polyplacophora body covered by 8 overlapping plates – poor fossil record on eyes or tentacles, marine Monoplacophora faintly segmented body covered by cap-shaped shell Cambrian-Devonian, Recent (1952)
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This note was uploaded on 10/23/2011 for the course GLY 1000 taught by Professor Parker during the Spring '11 term at FSU.

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Mollusc1 - MOLLUSCS Phylum Mollusca Subphylum Amphineura...

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