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Quenstedtoceras
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Quenstedtoceras : ウィキペディア英語版
Quenstedtoceras

''Quenstedtoceras'' is an ammonoid cephalopod genus that lived during the latter part of the Jurassic period in what is now France, Germany, and the United Kingdom.〔(''Quenstedtoceras'', Fossilworks Gateway )〕
==Morphologic description==
The shell of ''Quenstedtoceras'' is typically evolute and strongly ribbed, with all whorls visible. Widths vary according to the species from rather narrow to somewhat broad, as does ribbing. Ribs commonly start at the umbilical shoulder and extend laterally to about mid flank where they divide and curve forward toward the outer rim, or venter, and meet at a keel. Shells are of moderate size, commonly reaching diameters of about 6 cm (2.4 in).〔(Cardioceratidae-Cardioceratina, Ammonites et autres spirales )〕〔W.J.Arkell et al 1957. Treatise on Invertebrate Paleontology, Part L.〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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