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Encoiloceras : ウィキペディア英語版 | Encoiloceras
''Encoiloceras'' is a Tainoceratid genus, a nautiloid cephalopod in the order Nautilida that has been found in Upper Triassic (Carnian) sediments in the Alps and Hungary. ''Encoiloceras'' has an evolute shell with a wide umbilicus and large umbilical perforation in the middle. The whorl section is subquadrate with a rounded venter. Flanks bear thick, foldlike, ribs that thicken at the ventral shoulders. The suture has shallow lobes on all sides and the supuncle is close to the dorsum, i.e. to the inner rim. ''Encoiloceras'' is similar to ''Anoploceras'' in that both have pronounced ribbing, although stronger in ''Encoiloceras'', but differs in that ''Encoiloceras'' has a wide umbilical perforation, lacking in ''Anoploceras''. It is also similar to ''Enoploceras'' in that ''Enoploceras'' also has an umbilical perforation, altlhough smaller, and lacks the strong ribbing of ''Encoiloceras''. ==''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)
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