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Baltoceratidae
Baltoceratidae is an extinct family of orthoconic cephalopods belonging to the subclass Nautiloidea endemic to what would be Asia, Australia, Europe, North America, and South America during the Ordovician living from about 480–460 mya, existing for approximately . Taxonomy Baltoceratidae was named by Kobayashi (1935) and assigned to the Ellesmeroceratida by Flower and Kummel (1950) where it was retained by Unklesbay and Young (1956), again by Flower (1964)Flower 1964. The Nautiloid Order Ellesmeroceratida (Cephalopoda), Memoir 12, New Mexico Bureau of Mines and Mineral Resources, Socorro, NM , and by Furnish and Glenister in Teichert et al. (1964).Teichert et al 1964, Treatise on Invertebrate Paleontology Part K Mollusca 3, Nautiloidea-Ellesmerocerida by Furnish and Glenister, K129- K153 Flower (1964) included the Baltoceratidae in the ellesmeroceratid suborder Ellesmeroceratina. Further study of baltoceratid interiors, namely regarding the generally thin connecting r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rioceras
''Rioceras'' is an extinct genus of orthocerid cephalopods of the family Baltoceratidae that lived in what would be North America during the Early Ordovician from 480—472 mya, existing for approximately 8 million years.R. H. Flower. 1964. The Nautiloid Order Ellesmeroceratida (Cephalopoda). State Bureau of Mines and Mineral Resources, New Mexico Institute of Mining and Technology, Memoir 12:234 Taxonomy ''Rioceras'' was named by Flower (1964). Its type is ''Rioceras nondescriptum''. It was assigned to ''Baltoceratidae'' by Flower (1964) and Hook and Flower (1977),S. C. Hook and R. H. Flower. 1977. Late Canadian (Zones J, K) cephalopod faunas from Southwestern United States. New Mexico Bureau of Mines and Mineral Resources 32:1-56 but reassigned to the Ellesmeroceratidae by Kröger et al. (2007)B. Kröger, M. S. Beresi, and E. Landing. 2007. Early orthoceratoid cephalopods from the Argentine Precordillera (Lower-Middle Ordovician). Journal of Paleontology 81(6):1266-1283 Whethe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microbaltoceras
''Microbaltoceras'' is an extinct genus of the cephalopod family Baltoceratidae that lived in what would be North America during the Early Ordovician. It was named by Rousseau Flower (1964) and assigned by him to the Baltoceratidae. The type species is ''Microbaltoceras minore'' which was found in the Threadgill Member of the Tanyard Formation in Gillespie County, Texas, USA. The shell of ''Microbaltoceras'' is straight (orthconic) and tiny, with the siphuncle in narrow contact with the inner ventral surface. Its inclusion in the Baltoceratidae rather than in the Ellesmeroceratidae is based in large part on the lack of observable diaphragms in the siphuncle. The holotype of ''Microbaltoceras minore'' is only 10mm long, essentially all phragmocone The phragmocone is the chambered portion of the shell of a cephalopod. It is divided by septa into camerae. In most nautiloids and ammonoids, the phragmocone is a long, straight, curved, or coiled structure, in which the camarae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cochlioceras
''Cochlioceras'' is an extinct baltoceratid genus from the lower and middle Ordovician (Arenig - Llanvrin) of what are now Europe, the U.S (Vermont), and China, having existed for approximately 14 million years, from about 478 to 464 mya.Teichert et al 1964, Treatise on Invertebrate Paleontology Part K; Nautiloidea - Ellesmerocerida by W.M. Furnish and Brian F. Glenister, pp K129 -K160. Taxonomy ''Cochlioceras'' was named by Eichwald (1860). Its type is ''Cochlioceras avus''. It was assigned to the Baltoceratidae Baltoceratidae is an extinct family of orthoconic cephalopods belonging to the subclass Nautiloidea endemic to what would be Asia, Australia, Europe, North America, and South America during the Ordovician living from about 480–460 mya, exist ... by Furtnish and Glensiter in Teichert et al. (1964) and removed, with the Baltoceratidae, from the Ellesmerocerida to the Orthocerida by Kroger et al. (2007) References PaleoBiology Database: ''Cochlioceras'', basic in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyrtobaltoceras
''Cyrtobaltoceras'' is an extinct cephalopod genus known from the upper Lower Ordovician Fort Cassin Formation at Valcour, N.Y. that is included in the Nautiloid family Baltoceratidae Taxonomy ''Cyrtobaltoceras'' was named by Flower (1964 who then assigned it to the Baltoceratidae which at that time was included in the Ellesmerocerida The Ellesmerocerida is an order of primitive cephalopods belonging to the subclass Nautiloidea with a widespread distribution that lived during the Late Cambrian and Ordovician. Morphology The Ellesmerocerida are characterized by shells that .... The Baltoceratidae, along with included genera, has since been moved to the Orthocerida.Kroger et al 2007; Early orthoceratoid cephalopods from the Argentine Precordillera, Journal of Paleontology Nov 2007; v. 81; no. 6; p. 1266-1283; Morphology The genotype, ''Cyrobaltoceras gracile'' Flower, is based on a small, slender, incomplete, 25 mm long shell with a slight exogastric curvature. Sut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eosomichelinoceras
''Eosomichelinoceras'' is an extinct genus from the actively mobile carnivorous cephalopod family Baltoceratidae that lived in what would be Asia and South America during the Ordovician from 461—452 mya, existing for approximately . Taxonomy ''Eosomichelinoceras'' was named by Chen (1974)''Eosomichelinoceras'' at .org Its type is ''Eosomichelinoceras huananense''. It was assigned to '''' by Chen (1974); and to '' |
Rhabdiferoceras
''Rhabdiferoceras'' is an extinct genus of orthocerids belonging to the Baltoceratidae that lived in what would be North America during the Cassinian Stage at the end of the Early Ordovician, existing for approximately two million years from about 474 -472 mya. Taxonomy ''Rhabdiferoceras'' was named by Flower (1964). Its type is ''Rhabdiferoceras annuliferum''. It was assigned to ''Baltoceratidae'' by Flower (1964) and Hook and Flower (1977).R. H. Flower. 1964. The Nautiloid Order Ellesmeroceratida (Cephalopoda). State Bureau of Mines and Mineral Resources, New Mexico Institute of Mining and Technology, Memoir 12:234S. C. Hook and R. H. Flower. 1977. Late Canadian (Zones J, K) cephalopod faunas from Southwestern United States. New Mexico Bureau of Mines and Mineral Resources 32:1-56 Morphology ''Rhabdiferoceras'' is a rod-bearing baltoceratid with undulations on the dorsal side of the ventral siphuncular rod that correspond to the segments of the siphuncle. Septal necks are very ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Castelloceras
''Castelloceras'' is an extinct genus of actively mobile carnivorous cephalopod of the family ''Baltoceratidae'' that lived in what would be Europe during the Ordovician from 468—443.7 mya, existing for approximately . Taxonomy ''Castelloceras'' was named by Evans (2005). Its type is ''Castelloceras arennigense''. It was assigned to ''Baltoceratidae Baltoceratidae is an extinct family of orthoconic cephalopods belonging to the subclass Nautiloidea endemic to what would be Asia, Australia, Europe, North America, and South America during the Ordovician living from about 480–460 mya, exist ...'' by Evans (2005).D. H. Evans. 2005. The Lower and Middle Ordovician cephalopod faunas of England and Wales. Monograph of the Palaeontographical Society 623:1-81 Sources * ''Fossils'' (Smithsonian Handbooks) by David Ward {{Taxonbar, from=Q5049698 Prehistoric cephalopod genera Ordovician cephalopods Darriwilian first appearances Early Devonian genus extinctions Prehistoric a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endorioceras
''Endorioceras'' is an extinct genus of actively mobile carnivorous cephalopod of the family ''Baltoceratidae'' that lived in what would be North America during the Ordovician from 490–479 mya, existing for approximately . Taxonomy ''Endorioceras'' was named by Flower (1964). It is not extant. Its type is ''Endorioceras rarum''. It was assigned to ''Baltoceratidae'' by Flower (1964); and to ''Ellesmerocerida'' by Sepkoski (2002).S. C. Hook and R. H. Flower. 1977. Late Canadian (Zones J, K) cephalopod faunas from Southwestern United States. New Mexico Bureau of Mines and Mineral Resources 32:1-56 Morphology The shell is usually long, and may be straight ("orthoconic") or gently curved. In life, these animals may have been similar to the modern squid True squid are molluscs with an elongated soft body, large eyes, eight arms, and two tentacles in the superorder Decapodiformes, though many other molluscs within the broader Neocoleoidea are also called squid despite not s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semiannuloceras
''Semiannuloceras'' is an extinct genus of actively mobile carnivorous cephalopod of the family Baltoceratidae that lived in what would be Europe during the Ordovician from 490–460 mya, existing for approximately . Taxonomy ''Semiannuloceras'' was named by Evans (2005). Its type is ''Semiannuloceras abbeyense''. It was assigned to Baltoceratidae by Evans (2005).D. H. Evans. 2005. The Lower and Middle Ordovician cephalopod faunas of England and Wales. Monograph of the Palaeontographical Society 623 :1–81 Morphology The shell is usually long, and may be straight ("orthoconic") or gently curved. In life, these animals may have been similar to the modern squid True squid are molluscs with an elongated soft body, large eyes, eight arms, and two tentacles in the superorder Decapodiformes, though many other molluscs within the broader Neocoleoidea are also called squid despite not strictly fitting t ..., except for the long shell. References * ''Fossils'' (Smithsonian Han ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Troedsonnellidae
Troedssonellidae is a family of orthoceroid cephalopods from the Ordovician, derived from rod-bearing Baltoceratidae, that have a continuous lining within the siphuncle that resembles very thin and slender endocones. Shells are generally slender and orthoconic. The siphuncle is central or subcentral, composed of straight or slightly expanded segments. Septal necks generally short and connecting rings are thin. Thin cameral deposits (lining the chambers) are known, which along with the position of the siphuncle and thin connecting rings distinguishes them from the endocerids in which they have been included.Flower 1976. Ordovician Cephalopod Faunas and Their Role in Correlation, in The Ordovician System: proceedings of a Palaeontological Association symposium, Sept 1974 Troedsonnellids first appear high in Lower Ordovician (Cassinian) strata, beginning with '' Tajaroceras'' and extend at least through the Whiterock Stage The Whiterockian, often referred to simply as the White ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Veneficoceras
''Veneficoceras'' is a genus of the rod-bearing Baltoceratidae, an extinct cephalopod family with characteristics of the orthoceratoid Dissidocerida, found in Cassinianage, Lower Ordovician, limestone in western Utah Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to it .... Background ''Veneficoceras'' has a large tubular siphuncle with thin connecting rings that lies along the interior ventral margin. The endosiphuncular rod appears in vertical section to bifurcate into a larger ventral rod on the bottom and a smaller and shorter dorsal rod on top. In cross section a complete lining all around would probably appear, with a dorsally offset central opening. ''Veneficoceras'' is represented only by the type species, ''Venificoceras susanae'' of which there is only the holotype, a long por ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tajaroceras
''Tajaroceras'' is an extinct slender cephalopod from the uppermost Lower Ordovician of western North America, belonging to the Orthocerid family Troedssonellidae. Background The shell of ''Tajaroceras'' is smooth and straight. The siphuncle which is at least 0.35 the shell diameter is subcentral. Septal necks are short and the connecting rings are thin and homogeneous. The distinguishing feature of Tajaroceras lies within its siphuncle. Along the ventral side, within the siphuncle, is a continuous rod, much like that found in a group known as rod-bearing Baltoceratidae Baltoceratidae is an extinct family of orthoconic cephalopods belonging to the subclass Nautiloidea endemic to what would be Asia, Australia, Europe, North America, and South America during the Ordovician living from about 480–460 mya, exist .... On the dorsal side, overlying within, are annular deposits that grow forward to form a continuous lining that ultimately rests against the ventral rod, leaving a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |