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Lytocrioceras : ウィキペディア英語版 | Lytocrioceras
''Lytocrioceras'' is an ancyloceratine ammonite from the Lower Cretaceous with a shell that resembles a safety pin. The shell begins as a loosely wound spiral, followed by a straight shaft which makes a U-turn to go back is somewhat the opposite direction, ending in a jog, offset from the original coil. ''Lytocrioceras'' was originally included in the Ancyloceratidae (Lytoceratina), united with other similar forms but has since been reassigned to the Macroscaphitidae. ==References==
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「Lytocrioceras」の詳細全文を読む
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