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''Bitaunioceras'' is a Permian orthocerid with a gradually expanding, straight, orthoconic shell with straight transverse sutures and a small, subcentral siphuncle with staight tubular orthochoamitic necks. The shell surface of ''Bitaunioceras'' has a few, shallow, rounded constrictions and numerous, unequal, prominent transverse wire-like lirae. ''Bitaunioceras'' species have been found in Texas in the United States, Coahuila in Mexico, Sicily, Timor, and the south Urals in Russia. ==References== * Sweet, Walter C. 1964. Nautiloidea-Orthocerida. Treatise on Invertebrate Paleontology, Part K. Geological Soc of America, and Univ Kansas Press. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bitaunioceras」の詳細全文を読む スポンサード リンク
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