| 词条 | Trematoceras |
| 释义 |
| name = Trematoceras | fossil_range = U Triassic | image = | regnum = Animalia | phylum = Mollusca | classis = Cephalopoda | subclassis = Nautiloidea | ordo = Orthocerida | superfamilia = Orthocerataceae | familia = Orthoceratidae | subfamilia = Michelinoceratinae | genus = Trematoceras | genus_authority = Eichwald, 1851 }} Trematoceras is an orthoconic nautiloid cephalopod from the Upper Triassic of Europe and Asia named by Eichwald in 1851. TaxonomyTrematoceras is included in the Michelinoceratinae, a subfamily of the Orthoceratidae[1]MorphologyTrematoceras has a slender, subcylindrical shell with a bluntly pointed apex, long chambers, straight transverse sutures, and a smooth or faintly cancellated surface. The siphuncle is central, tubular, and empty; septal necks short, orthochaonitic; connecting rings cylindrical or only faintly expanded. Chambers contain prominent lamelar mural and episeptal deposits.[1]DistributionTrematoceras has been found in Upper Triassic sediments in Afghanistan, Kazakhstan, and the Russian Federation.[2]References1. ^1 Sweet, W.C. 1964. Nautiloidea- Orthocerida. Treatise on Invertebrate Paleontology, Part K. Geol. Soc. of America and Univ Kansas Press {{Taxonbar|from=Q7838046}}2. ^Trematoceras -Paleobio db 1 : Nautiloids |
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