Sinuopeidae is an extinct family of fossil sea snails, Paleozoic gastropod molluscs.
This family is unassigned to superfamily. This family consists of three following subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005): Sinuopeinae Wenz, 1938 Platyschismatinae Knight, 1956Knight J. B. 1956. New families of Gastropoda. Journal of the Washington Academy of Sciences 46(2): 41-42. Turbonellininae Knight, 1956
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