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|regnum = Animalia |phylum = Mollusca |classis = Cephalopoda |subclassis = Ammonoidea |ordo = Ammonitida |superfamilia = Haplocerataceae |familia = Oppeliidae |genus = ''Alcidellus'' | genus_authority = Westermann, 1958 }} ''Alcidellus'' is an oxyconic (sharp ventered) haploceratacean ammonite from the Middle Jurassic. ''Alcidellus'' was named as a genus buy Gerd Westermann in 1958. It is now generally seen as a subgenus of ''Oxycerites'', differing from ''Oxyceratites (O)'' in having a broader venter with ventrolateral shoulders. The shell of ''Oxycerites'', including ''O (Alcidellus)'' is generally smooth, essentially involute with a small umbilicus, highly compressed with flanks converging on a narrow, somewhat sharp venter. Sutures are ammonitic. ==''References''== * An Early Bathonian Tethyan Ammonite Fauna from Argentina, by Alberto C Riccardi and Gerd E.G. Westermann. Palaeontology, Volume 42. no2, pub online 21 Nov 2003. () * Upper Bathonian and lower Callovian ammonites from Chacay Melehue (Argentina), by Horacio Parent. Acta Palaeontologica Polonica 43, 1, 69-130. 1998. () 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「Alcidellus」の詳細全文を読む スポンサード リンク
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