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Lytoceratinae : ウィキペディア英語版 | Lytoceratinae
Lytoceratinae is a subfamily of ammonoid cephalopods that make up part of the family Lytoceratidae. ==Description== They are characterized by shells in which the whorls bear growth lines or lamellar folds, or both, commonly corresponding to constrictions in the internal mold. The external suture, that not lying against the previous whorl, has two lateral lobes (per side), the first being much larger. The internal lobe, which lies against the previous whorl, has a cruciform dorsal lobe.
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「Lytoceratinae」の詳細全文を読む
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