Rodzaj Anisomyon Meek & Hayden, 1860
Gatunek typowy Opis Medium−sized, thin, asymetrically conical patelliform shells; surface generally smooth except for concentric growth lines and occasional faint ribs radiating. Apex subcentral, curved backwards. Muscle scars horseshoe shaped, interrupted on left anterior and occasionally broken into intermittent patches of attachment on right posteriori. Synonimy Zasięg czasowy Valanginian (Early Cretaceous) to Late Cretaceous. Literatura Kaim, A. 2004. The evolution of conch ontogeny in Mesozoic open sea gastropods. Palaeontologia Polonica 62, 3–183 Meek, F.B. & Hayden, F.V. 1860a. On a new genus of Patelliform shells from the Cretaceous rocks of Nebraska. AmericanJournal of Science and Arts 29, 33–35. |
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