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Holmiceras
''Holmiceras'' is one of two ancestral lituitids from the late Early Ordovician (Arenigian). The other being ''Ancistroceras''. ''Holmiceras'' begins with about 1.5 to 2 loosely coiled whorls followed by a rapidly expanding orthocone, much like ''Ancistroceras'' except for the apical whorls and that Holmiceras is known only from the late Early Ordovician whereas ''Ancestroceras'' extends through the middle of the period. ''Holmiceras'' may have given rise to ''Angelinoceras'' which begins with an expanding open spiral. ==See also==
*List of nautiloids
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「Holmiceras」の詳細全文を読む
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