Pinacoceratoidea, formerly Pinacocerataceae, are generally smooth, compressed, evolute to involute ammonoids from the Triassic, belonging to the Ceratitida, in which the suture is ammonitic, with adventitious and auxiliary elements. As presently conceived, the Pinacoceratoidea, named by Mojsisovics, 1879, combines six families; the: * * * Gymnitidae * * * Fossils have been found in Triassic sediments in the United States in California, Nevada, and Alaska; in Canada in British Columbia; in Europe widespread; in China, Russia, Afghanistan, and Vietnam.
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