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

''Subvestinautilus'' is an evolute koninckioceratid genus, order Nautilida, with a depressed, trapezoidal whorl section. The venter is broadly rounded, ventrolateral shoulders sharply rounded, flanks flattened and converging toward a narrow rounded dorsum. In early growth stages a keel forms on the umbilical shoulder which becomes rounded or marked by a longitudal rib at maturity . The suture has a broadly rounded ventral lobe and a deeper lateral lobe.
''Subvestinautilus'', named by Turner, 1954, has been found in the Lower Carboniferous of Ireland and the Isle of Man.
==''References''==

*Bernhard Kummel, 1964. Nautiloidea-Nautilida. Treatise on Invertebrate Paleontology, Part K. Geological Soc. of America and University of Kansas press. Teichert and Moore (eds)
*(Koninckioceratidae-Paleodb )


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