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Schlotheimia : ウィキペディア英語版 | Schlotheimia
''Schlotheimia'' is an extinct cephalopod genus belonging to the subclass Ammonoidea that lived during the Hettangian stage at the beginning of the Early Jurassic.〔(Jack Sepkoski's list of Cephalopod general )〕 ==Description== The shell, or conch, of ''Schlotheimia'' rather evolute, coiled with all whorls exposed and only slightly embracing. The umbilicus is perforate as with more finely ribbed ''Angulaticeras''. whorls are compressed, bearing ribs that cross the venter in chevrons, less developed in ''Sulciferites
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「Schlotheimia」の詳細全文を読む
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