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|regnum = Animalia |phylum = Mollusca |classis = Cephalopoda |subclassis = Ammonoidea |ordo = Ammonitida |superfamilia = Stephanocerataceae |familia = Stephanoceratidae |genus = ''Phaulostephanus'' }} ''Phaulostephanus'' is an extinct genus from the ammonoid family Stephanoceratidae, which is part of the ammonitid superfamily Stephanocerataceae, that lived during the early Middle Jurassic.〔The Bajocian (Jurassic) ammonite fauna of Oaxaca, Mexico; Jose Sandoval & Gerd E. G. Westermann; Jour Paleo V.67, N.6, p.1220, Nov. 1986〕〔Mesozoic Ammonoidea, Arkell, Kummel, & Wright 1957; Treatise on Invertebrate Paleontology, Part L, Mollusca 4〕 ''Phaulostephanus'' is a small serptenticone with a generally subcircular to subquadrate whorl section, slightly sinuous ribbing, and tubercles that if present are weakly developed. Primary ribs are sharp, divide about mid flank into prominent and moderately sharp secondary ribs. The aperture of the macroconch has a broad ventral collar preceded by a constriction. That of the microconch is flanked by lappets and has no constriction.The suture is ammonitic.〔 ''Phaulostephanus'' was named by Buckman in 1927 and considered a subgenus of ''Stephanoceras'' by Arkell, et al.(1957)〔 in the Treatise. It was elevated to genus in Pavia (1983) and Westermann (1984) (ref't in Sandoval and Westermann 1986〔 ) ==Distribution== Mexico and Hungary 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「Phaulostephanus」の詳細全文を読む スポンサード リンク
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