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Arkelloceras : ウィキペディア英語版 | Arkelloceras
''Arkelloceras'' is an early Middle Jurassic (Bajocian stage) Stephanoceratacean (Ammonitina) genus from arctic Canada, Alaska, and Siberia belonging to the family Otoitidae (Imlay 1984, Westermann 1965) ''Arkelloceras'' seems to be a direct descendant of ''Abbasites'' and is thought to have given rise to ''Ermoceras'' and possibly to ''Thamboceras''. (Westermann 1965) ==''References''==
* Imlay, Ralph W. 1984. Early and Middle Bajocian (Middle Jurassic) Ammonites from Southern Alaska;U.S.G.S PP 1322 () * Westermann, G. E. G. 1965.Septal and Sutural Patterns in Evolution and Taxonomy of Thamboceratidae and Clydoniceratidae (M Jurassic Ammonitina). Jour of Paleontology 39(5)864-874, Sept.
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