Curtoceras is a genus in the tarphycerid family Trocholitidae found widespread in the late Early and Middle Ordovician of North America and northern Europe. Curtoceras has a shell that is gradually expanded, with half the fully mature body chamber divergent from the preceding volution. Whorl sections are near equidimentional with the inner margin (dosum) moderately impressed. The surface may be smooth or weakly ribbed. The siphuncle is ventral in the initial chamber and becomes dorsal after one volution. With the exception of the dorsal siphuncle, Curtoceras is somewhat similar to the tarphyceratidCampbelloceras
Curtoceras
Temporal range: Early Ordovician–Middle Ordovician
Furnish, W.M. and Glenister, Brian F 1964; Nautiloidea -Tarphycerida, in Treatise on Invertebrate Paleontology, Part K, Nautiloidea; Geological Society of America and University of Kansas press.
August 29, 2023
curtoceras, genus, tarphycerid, family, trocholitidae, found, widespread, late, early, middle, ordovician, north, america, northern, europe, shell, that, gradually, expanded, with, half, fully, mature, body, chamber, divergent, from, preceding, volution, whorl. Curtoceras is a genus in the tarphycerid family Trocholitidae found widespread in the late Early and Middle Ordovician of North America and northern Europe Curtoceras has a shell that is gradually expanded with half the fully mature body chamber divergent from the preceding volution Whorl sections are near equidimentional with the inner margin dosum moderately impressed The surface may be smooth or weakly ribbed The siphuncle is ventral in the initial chamber and becomes dorsal after one volution With the exception of the dorsal siphuncle Curtoceras is somewhat similar to the tarphyceratid CampbellocerasCurtocerasTemporal range Early Ordovician Middle Ordovician PreꞒ Ꞓ O S D C P T J K Pg NScientific classificationDomain EukaryotaKingdom AnimaliaPhylum MolluscaClass CephalopodaSubclass NautiloideaOrder TarphyceridaFamily TrocholitidaeGenus CurtocerasUlrich Foeste Miller amp Furnish 1942See also EditList of nautiloidsReferences EditFurnish W M and Glenister Brian F 1964 Nautiloidea Tarphycerida in Treatise on Invertebrate Paleontology Part K Nautiloidea Geological Society of America and University of Kansas press Retrieved from https en wikipedia org w index php title Curtoceras amp oldid 1085342465, wikipedia, wiki, book, books, library,
