T. E. Yancey; A new genus of Permian siphonodentalid scaphopods, and its bearing on the origin of the Siphonodentaliidae. Journal of Paleontology ; 47 (6): 1062–1064. doi:
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Extending range of family from late Mesozoic to late Paleozoic, Calstevenus n. gen., C. arcturus n. sp., Nevada
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