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Oxynoticeratidae : ウィキペディア英語版 | Oxynoticeratidae
Oxynoticeratidae is a family of true ammonites (order Ammonitida) included in the superfamily Psilocerataceae. Oxynoticeratids have a broad, worldwide distribution but a narrow stratigraphic one, being known only from the Upper Sinemurian and Lower Pliensbachian, 〔 (Ammonites.fr )〕 〔 Sepkoski, Jack (Sepkoski's Online Genus Database – Cephalopoda )〕 during which their shells changed little in form. ==Genera==
*''Cheltonia'' *''Gleviceras'' Buckman 1918 *''Hypoxynoticeras'' *''Oxynoticeras'' *''Paracymbites'' *''Paroxynoticeras'' *''Radstockiceras'' *''Slatterites'' 〔
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