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Liroceras : ウィキペディア英語版
Liroceras


''Liroceras'' is the type genus of the clydonautiliacean family, Liroceratidae, and is characterized by a rapidly expanding, subglobular, nautiliconic shell with a reniform whorl section, small umbilicus, essentially straight sutures, and a siphuncle with a variable but not marginal position.
''Liroceras'' has a range from the Mississippian to the Permian, longest of the Liroceratidae. It has been found the North America, Europe, China and the East Indies. ''Condraoceras'' differs in having a circular cross section and shallow ventral and lateral lobes. ''Bistrialites'' also has a reniform whorl section but differs in having a large funnel-shaped umbilicus.
==''References''==

*Bernhard Kummel, 1964. Nautiloidea-Nautilida; ''Treatise on Invertebrate Paleontology'', Part K. Geol Soc of America and Univ of Kansas Press, R. C. Moore (ed) — Liroceratidae K444–K447.


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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