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1 January 2013 Monoplacophora (Tryblidia)—Some Unanswered Questions
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Abstract

A review of the current state of knowledge on the Monoplacophora, a taxon crucial for assessing phylogeny of the Mollusca, is provided. A number of questions related to this taxon have been resolved; the seriality of some organ systems is now regarded as secondarily gained within mollusks and shared with polyplacophorans; the tergomyan-cyclomyan condition does not reflect a principal difference in organization. Other topics remain to be resolved. These concern the relationships amongst monoplacophorans and the placement of the Monoplacophora within the Mollusca. Furthermore we point out a number of issues to be investigated (e.g., mechanism of excretion or development sequence of gills and muscles, gene expression) by fine structural, ontogenetic, or molecular analyses.

Gerhard Haszprunar and Bernhard Ruthensteiner "Monoplacophora (Tryblidia)—Some Unanswered Questions," American Malacological Bulletin 31(1), 189-194, (1 January 2013). https://doi.org/10.4003/006.031.0111
Received: 8 October 2012; Accepted: 1 October 2012; Published: 1 January 2013
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