Trigonoceratidae

	Trigonoceratidae The Trigonoceratidae is a family of coiled nautiloid cephalopods that lived during the period from the Early Carboniferous (Mississippian) to the Early Permian. Diagnosis Trigonoceratidae comprise members of the order Nautilida characterized by a loosely coiled to evolute shell generally bearing longitudinal ribs or ridges with a whorl section that is oval to subquadrate and varying from compressed (squeezed) to depressed (flattened). (Kummel 1964) Classification and phylogeny Taxonomic position The Trigonoceratidae along with four other related families are combined in the Superfamily Trigonocerataceae in the Treatise,(''ibid'' Kummel) a superfamily. They are also the Triboloceratidae (Flower and Kummel, 1950) which form the Tribolocerataceae within the Centroceratina of the Osnovy according to Shimansky. The Trigonocerataceae and Centroceratina are essentially equivalent as are the Trigonoceratidae and Triboloceratidae. Derivation The Trigonerceratidae were derived from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Centroceratina The Trigonoceratoidea are a superfamily within the Nautilida that ranged from the Devonian to the Triassic, thought to have contained the source for the Nautilaceae in which ''Nautilus'' is found. Trigonoceratoidea are characterized by open-spiraled, gyroconic, to closed, nautiliconic shells in which the Whorl section is quadrate in primitive forms; the venter typically narrow to acute, the dorsum broad. In some advanced forms, the venter may become concave or broad and rounded, and in some, the surfaces may be strongly lirate. Classification and phylogeny The Trigonoceratoidea are based on the family Trigonoceratidae of Alpheus Hyatt, 1884, with which other phylogenetically related families are combined, and are equivalent to the abandoned Centroceratida of Flower in Flower and Kümmel 1950, and to the Centroceratina of Shimanskiy 1957, revised to the Centrocerataceae, Shimanskiy 1962. The Trigonoceratoidea combine five families, the type, Trigonoceratidae, along with the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Trigonoceras ''Trigonoceras'' is an extinct genus of prehistoric nautiloids from the nautilid family Trigonoceratidae that lived during the Early Carboniferous in what is now western Europe. ''Trigonoceras'' has a very loosely coiled gyroconic or cyrtoconic shell with a subtriangular cross section, as indicated by fragmentary specimens. The venter on the outer rim or convex side is broad and transversely concave with angular shoulders; the sides which converge on a narrow dorsum are broadly convex. The siphuncle is slightly dorsal of the center and is orthochoanitic.(,B.1964.) A member of the Trigonoceratidae, ''Trigonoceras'' is also a component of the superfamily Trigonocerataceae References * ,B.1964. Nautiloidea-Nautilida ''in the'' Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Maccoyoceras ''Maccoyoceras'' is a genus of nautilids included in the family Trigonoceratidae The Trigonoceratidae is a family of coiled nautiloid cephalopods that lived during the period from the Early Carboniferous ( Mississippian) to the Early Permian. Diagnosis Trigonoceratidae comprise members of the order Nautilida characterized ... from the Mississippian of North America (Michigan) and Europe. The shell of ''Maccoyoceras''is evolute, volutions only slightly impressed, whorl section hexagonal. Venter flattened, flanks converging, umbilical shoulder prominent. Siphuncle slender, ventral of whorl center. References * Barnhard Kummel, 1964. Nautiloidea - Nautilida; Treatise on Invertebrate Paleongology, Part K. Geological Society of America and University of Kansas Press. Prehistoric nautiloid genera {{paleo-nautiloidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Aphelaeceras ''Aphelaeceras'' is an extinct genus from the nautilid family Trigonoceratidae which is part of the Trigonocerataceae, that lived during the Mississippian Period in the late Paleozoic. Aphelaeceras'' is evolute, compressed, with a wide umbilicus and small dorsal impression. Whorl section is subrectangular with convex sides that slope toward a concave venter. Ventral shoulder are subangular, umbilical shoulders broadly rounded. The suture has a narrow ventral lobe and broad lateral lobes. The siphuncle is barely ventral from the center. ''Aphelaeceras'' has been found in Mississippian (L. Carb) strata in North America and Europe. The genus was named by Hyatt, 1844. The type, ''A. difficile'' (DeKoninck) came from Belgium Belgium, ; french: Belgique ; german: Belgien officially the Kingdom of Belgium, is a country in Northwestern Europe. The country is bordered by the Netherlands to the north, Germany to the east, Luxembourg to the southeast, France to th .... '' Mes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Chouteauoceras ''Chouteauoceras'' is an openly coiled, gyroconic, nautiloid cephalopod from the Mississippian of North America belonging to the Nautilid family Trigonoceratidae, and superfamily Trigonocerataceae The Trigonoceratoidea are a superfamily within the Nautilida that ranged from the Devonian to the Triassic, thought to have contained the source for the Nautilaceae in which ''Nautilus'' is found. Trigonoceratoidea are characterized by open-spir .... The whorl section of ''Chouteauoceras'' is ovate, higher than wide. The surface is covered with numerous longitudinal ridges and fine growth lines. The suture has broad rounded lateral lobes and dorsal and ventral saddles. The siphuncle is small, subcentral. References * Kummel, B, 1964; Nautiloidea- Nautilida; Treatise on Invertebrate Paleontology Part K Nautiloidea; Geological Society of America and University of Kansas Press. {{Taxonbar, from=Q5105476 Prehistoric nautiloid genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Rineceras ''Rineceras'' is an extinct genus from the nautilid family Trigonoceratidae which is part of the Trigonocerataceae, that lived during the Mississippian Period in the late Paleozoic. ''Rineceras'' is described in the Treatise, in Kummel, 1964, as being evolute with volutions in contact but not deeply impressed at maturity and the whorl section elliptical and depressed; the conch (shell) bearing prominent longitudinal ridges, which may be spinose. ''Rinceras'' is illustrated, fig. 311-4 p. K429, as a closely coiled gyrocone of about two volutions, whorls not in contact. Longitudinal ridges (ribs) are shown. The illustration is designated as ''R. propinquum'' (DeKoninck), the type. ''Rineceras'' is similar to '' Pararineceras'', '' Thrincoceras'', ''Discitoceras'', and ''Chouteauoceras ''Chouteauoceras'' is an openly coiled, gyroconic, nautiloid cephalopod from the Mississippian of North America belonging to the Nautilid family Trigonoceratidae, and superfamily Trigonocera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Stroboceras ''Stroboceras'' is an extinct genus of nautiloids named by Hyatt in 1884 that's included in the nautilid family Trigonoceratidae; the group that have rise to the Nautilidae The nautilus (, ) is a pelagic marine mollusc of the cephalopod family Nautilidae. The nautilus is the sole extant family of the superfamily Nautilaceae and of its smaller but near equal suborder, Nautilina. It comprises six living species in t ... which includes the living '' Nautilus''. ''Stroboceras'' is characterized by a loosely coiled evolute shell bearing prominent longitudinal ridges and grooves; with a variable cross section, generally higher than wide, flanks convergent on the venter, and a subcentral siphuncle. References * Barnard , 1957. Nautiloidea-Nautilida. Treatise on Invertebrate Paleontology, Part K. Geol. Soc. of America and Univ. Kansas Press. Sepkoski's cephalopd genera Prehistoric nautiloid genera {{paleo-Nautiloidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]