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Conchifera
Taxonomic term for shell-bearing molluscs From Wikipedia, the free encyclopedia
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Conchifera is a subphylum of the phylum Mollusca, containing five extant classes: Monoplacophora, Cephalopoda, Gastropoda, Bivalvia, and Scaphopoda.[1][2] Conchiferans can bear a single shell as in snails and ammonites, a single pair of shells as in clams, or lack a shell as in slugs and squid. The other subphylum is Aculifera, the members of which are shellless or have a row of several plates. Non-monoplacophoran conchiferans emerged within the once-widespread Monoplacophora. The only descendant which retains its ancestral shape is the Tryblidiida. [clarification needed]
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The monophyly of Conchifera is supported by molecular phylogenetic analysis.[1] The relationships among the members of Conchifera are disputed.[1] A grouping of Scaphopoda and Bivalvia, named Diasoma, has been proposed,[3][4] but other studies find scaphopods to be more closely related to cephalopods[5] or gastropods.[1]
Conchifera originated in the early Cambrian period.[1][4]
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Classes
Classes within the Conchifera include:
See also
References
External links
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