| 词条 | Enoploceras |
| 释义 |
| name = Enoploceras | fossil_range = Triassic | image = | regnum = Animalia | phylum = Mollusca | classis = Cephalopoda | subclassis = Nautiloidea | ordo = Nautilida | superfamilia = Tainocerataceae | familia = Tainoceratidae | genus = Enoploceras | genus_authority = Hyatt in Zittel 1900 }} Enoploceras is a Tainoceratid genus, a nautiloid cephalopod in the order Nautilida, known from Triassic sediments in Europe, India, Timor, and the state of Idaho. Enoploceras is characterised by its moderately involute shell with a broad subquadrarte whorl section; venter and flanks flattened; ventral and umbilical shoulders sharply rounded; flanks with nodes at ventral or umbilical shoulders or both, and with radial ribs and sinuous growrth lines; umbilicus deep, straight walled, and with small perforation. The siphuncle is subcentral. Sutures form shallow lobes on the venter, flanks and dorsum. Enoploceras is like Anoploceras in that both have a broad subquadrate, wider than high, whorl section but differs in that Anoploceras has conspicuous ribs while Enoploceras has primarily nodes. References
1 : Nautiloids |
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