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Monoplacophorans

Monoplacophora

Morphology
provided by Animal Diversity Web

Other Physical Features: ectothermic ; bilateral symmetry

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The Regents of the University of Michigan and its licensors
bibliographic citation
Myers, P. and J. Burch 2001. "Monoplacophora" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Monoplacophora.html
photographer
Phil Myers, Museum of Zoology, University of Michigan-Ann Arbor
author
John B. Burch, Mollusk Division, Museum of Zoology, University of Michigan-Ann Arbor
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ID
Monoplacophora/physical_description
Classification
provided by World Register of Marine Species
The only classification problem with modern monoplacophorans is the discussion around using Monoplacophora Odhner, 1940 vs. Tryblidiida. Monoplacophora sl. as defined in Runnegar & Jell (1976) would include three orders among which Tryblidiida. Problems arise from the ambiguous position of some paleozoic fossil taxa which could be monoplacophorans or gastropods, or (worse) stem-group gastropods derived from monoplacophorans, thus making Monoplacophora paraphyletic. Preference for the name Tryblidiida follows Waller's (1998) conclusion that these are the sister-group to all other Conchifera, thus escaping being paraphyletic. Giribet et al. (2006: Proceedings of the National Academy of Sciences 103, 7723-7728) claimed that the monoplacophoran Laevipilina is recovered within a branch containing polyplacophoran taxa in an analysis including several nuclear and mitochondrial sequences. As mentioned above, this result based on a very small specimen is ignored in the classification draft until further confirmed.
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WoRMS Editorial Board
i18n: Contributor
Gofas, Serge [email]
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World Register of Marine Species
ID
WoRMS:note:139117