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Unipeltoceras : ウィキペディア英語版 | Unipeltoceras
''Unipeltoceras'' is an extinct ammonite genus included in the perisphictacian family, Aspidoceratidae, and a member of the subfamily Peltoceratinae, that lived during the Callovian stage, late in the Middle Jurassic. ''Unipeltoceras'' is characterized by its strongly evolute, discoidal shell with sharp ribbing on the inner whorls and differing from ''Peltoceras'', s.s. by having only an outer row of tubercles on the outer whorls. ==''References''==
*Arkell, et al., 1957. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L (Ammonoidea). Geol Soc of America and Univ Kansas Press. p. L336
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