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Troostoceras : ウィキペディア英語版 | Troostoceras
''Troostoceras'' is an actinoceratid Nautiloid with a cyrtoconic shell, otherwise similar to ''Actinoceras''. The shell is slightly endogastric, curved such that the under or ventral side is longitudinally concave, tucked in. The siphuncle is ventral and is in contact with the shell wall. Segments begin small but expand during growth. ''Troostoceras'' has been found in the Middle Ordovician of eastern North America and Siberia and may be a variety of ''Actinoceras'', along with ''Saffordoceras'' and ''Leurorthoceras'' ==references==
*Flower R.H 1968, The First Great Expansion of the Actinoceroids, New Mexico Bureau of Mines and Mineral Resources Memoir 19 Part I, Socorro NM *
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「Troostoceras」の詳細全文を読む
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