Multiplacophora
Multiplacophora is a stem-group of chitons with a number of plates arranged in 7 rows along the body. They date to at least the Upper Cambrian, but two lower Cambrian fossils- ''Ocruranus'' and ''Trachyplax'' - may extend the range downwards. Families and genera * Family Hercolepadidae Dzik, 1986 ** Genus ''Hercolepas'' Aurivillius, 1892 ** Genus ''Protobalanus (chiton), Protobalanus'' Hall and Clarke, 1888 * Family Strobilepidae Hoare and Mapes, 1995 ** Genus ''Aenigmatectus'' Hoare and Mapes, 1996 ** Genus ''Deltaplax'' Puchalski, Johnson, Kauffman and Eernisse, 2009 ** Genus ''Diadeloplax'' Hoare and Mapes, 1995 ** Genus ''Hannestheronia'' Vinther, Jell, Kampouris, Carney, Racicot & Briggs, 2012 ** Genus ''Polysacos'' Vendrasco, Wood and Runnegar, 2004 ** Genus ''Strobilepis'' Clarke ''in'' Hall and Clarke, 1888 References

{{Taxonbar, from=Q15076861 Devonian animals Late Devonian animals Chitons ...
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Polysacos
''Polysacos'' is an extinct genus of multiplacophorans (chitons) known from articulated Carboniferous fossils; its seventeen shell plates are arranged in three rows, with seven iterated units. It demonstrates that multiplacophora are related to modern polyplacophora. It was fringed with a ring of hollow spines resembling those of the Ordovician ''Echinochiton''. References

Prehistoric chiton genera {{paleo-mollusc-stub ...
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