Kingdom Animalia Class Cephalopoda Order Orthocerida Rank Genus | Phylum Mollusca Subclass Nautiloidea Superfamily Orthocerataceae | |
Trematoceras is an orthoconic nautiloid cephalopod from the Upper Triassic of Europe and Asia named by Eichwald in 1851.
Contents
Taxonomy
Trematoceras is included in the Michelinoceratinae, a subfamily of the Orthoceratidae
Morphology
Trematoceras 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.
Distribution
Trematoceras has been found in Upper Triassic sediments in Afghanistan, Kazakhstan, and the Russian Federation.
References
Trematoceras Wikipedia(Text) CC BY-SA