Abstract

Uppermost Jurassic (Volgian) rocks of the western Canadian Arctic Islands and northwestern mainland Canada contain rich faunas that include two oxytomid bivalves that are described as specifically and generically new: Canadotis canadensis n. gen., n. sp. and Arctotis (Canadarctotis) srugosa n. subgen., n. sp. The former is thought to be a derivative of an ancestral Meleagrinella-like Late Triassic or Early Jurassic bivalve; the latter is a development from mid-Jurassic Arctotis s.s. species. Both are important markers for the early Volgian in northern and northwestern Canada.

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