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Asymptoceras : ウィキペディア英語版 | Asymptoceras
''Asymptoceras'' is an aipoceratid genus (Nautiloidea) similar to ''Aipoceras'' but tightly coiled and with only part of the body chamber divergent from the previous whorl. Shell evolute, expanding fairly rapidly; umbilicus open, perforate; whorl section ovoid to subquadrate. ''Asymptoceras'' is known from Mississippian (Lower Carboniferous) sediments in Europe and North America. ==References==
* Bernard Kummel, 1964. Nautiloidea - Nautilida; Treatise on Invertebrate Paleontology, Part K. Geological Society of America. * ( ''Asymptoceras'' ) in (Fossilworks )
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