The Paleoloricata are valved polyplacophora without sutural laminae or insertion plates (as found in the neoloricata).[1] The "order" probably represents a paraphyletic grouping.[1]
References
^ abcPojeta, J. Jr.; Vendrasco, M. J.; Darrough, G. (2010). "Upper Cambrian chitons (Mollusca, Polyplacophora) from Missouri". Bull Amer Paleo. (379): 1–82. ISSN0007-5779.
^van Belle, R. A. (1981). Catalogue of Fossil Chitons. ISBN90 6279 018 6.