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Praenuculidae
Praenuculidae is an extinct family (biology), family of prehistoric bivalves in the superfamily (taxonomy), superfamily Nuculoidea. Praenuculidae species lived from the early Ordovician, Arenig, Arenig stage through the Early Devonian Emsian, Emsian stage.The Paleobiology Database Praenuculidae entry accessed 11 January 2012 Praenuculidae fossils are found worldwide, present on every continent except Antarctica. Species in this family are thought to have been Sessility (zoology), sessile, attached to the substrate in shallow infaunal marine water environments, where they formed shells of an aragonite composition. The family Praenuculidae was named by A. Lee McAlester in 1969. Description Praenuculidae first eme ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Praenuculinae
Praenuculinae is an extinct subfamily of prehistoric bivalves in the family Praenuculidae. Praenuculinae species lived from the middle Ordovician through the late Devonian.The Paleobiology Database Praenuculinae entry accessed 5 February 2012.The Paleobiology Database ''Praenucula'' entry accessed 5 February 2012. Praenuculinae fossils are found in Europe, Africa, North America and South America, [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Concavodontinae
Concavodontinae is an extinct subfamily of prehistoric bivalves in the family Praenuculidae. Concavodontinae species lived from the middle Ordovician, Caradoc epoch through the late Ordovician Ashgill epoch.The Paleobiology Database Concavodontinae entry accessed 19 January 2012The Paleobiology Database ''Concavodonta'' entry accessed 19 January 2012 Concavodontinae fossils are found in Europe and South America, and species are thought to have been stationary attached to substrate in sh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Similodonta
''Similodonta'' is an extinct genus of early bivalve in the extinct family Praenuculidae. The genus is one of eleven genera in the subfamily Praenuculinae. ''Similodonta'' is known from Middle Ordovician through Middle Silurian fossils found in Europe and North America. The genus currently contains eight accepted species, ''Similodonta ceryx'', ''Similodonta collina'', ''Similodonta djupvikensis'', ''Similodonta magna'', ''Similodonta recurva'', ''Similodonta spjeldnaesi'', ''Similodonta wahli'' and the type species ''Similodonta similis''. Description ''Similodonta'' is a small bivalve which was first described in 1964 by Helen Soot-Ryen in an ''Arkiv för Mineralogi och Geologi, Kungliga Svenska Vetenskapsakademien'' paper. Generally the shells of ''Similodonta'' are rounded on the ventral sides of the shell and triangular on the dorsal sides. The triangular shape on the dorsal side is formed by the sharp angle at which the anterior and posterior hinge edges meet at the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cuyopsis
''Cuyopsis'' is an extinct genus of bivalve in the extinct family Praenuculidae. The genus is one of eleven genera in the subfamily Praenuculinae. It is one of three Praenuculinae genera known solely from late Ordivician, Caradoc epoch, fossils found in South America. ''Cuyopsis'' currently contains a single accepted species, ''Cuyopsis symmetricus''. Description ''Cuyopsis symmetricus'' was first described in 1999 by Teresa M. Sánchez from fossils in sediments of the late Middle Ordivician, Caradocian aged Don Braulio Formation. The formation outcrops on the flank of Sierra de Villicum in the Argentina precordillera Precordillera is a Spanish geographical term for hills and mountains lying before a greater range, foothills. The term is derived from ''cordillera'' (mountain range)—literally "pre-mountain range"—and applied usually to the Andes. Some places .... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emiliodonta
''Emiliodonta'' is an extinct genus of bivalve in the extinct family Praenuculidae. The genus is one of three genera in the subfamily Concavodontinae. ''Emiliodonta'' is known solely from late Ordovician, Caradocian epoch, fossils found in South America. The genus contains a single accepted species, ''Emiliodonta cuerdai''. Description ''Emiliodonta cuerdai'' is a bivalve first described in 1999 by Teresa M. Sánchez from fossils from sediments of the late Middle Ordovician, Caradocian-aged Don Braulio Formation. The formation outcrops on the flank of Sierra de Villicum in the Argentina precordillera.The Paleobiology database "Sierra de Villicum" entry accessed 17 January 2012 Generally the shells of ''Emiliodonta cuerdai'' are rounded and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemiconcavodonta
''Hemiconcavodonta'' is an extinct genus of bivalve in the extinct family Praenuculidae. The genus is one of three genera in the subfamily Concavodontinae. ''Hemiconcavodonta'' is known solely from late Ordovician, Caradoc epoch, fossils found in South America. The genus currently contains a single accepted species, ''Hemiconcavodonta minuta''. Description ''Hemiconcavodonta minuta'' is a bivalve which was first described in 1999 by Teresa M. Sánchez from fossils from sediments of the late Middle Ordovician, Caradocian-aged Don Braulio Formation. The formation outcrops on the flank of Sierra de Villicum in the Argentina precordillera Precordillera is a Spanish geographical term for hills and mountains lying before a greater range, foothills. The term is derived from ''cordillera'' (mountain range)—literally "pre-mountain range"—and applied usually to the Andes. Some places .... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Concavodonta
''Concavodonta'' is an extinct genus of early bivalve in the extinct family Praenuculidae. The genus is one of three genera in the subfamily Concavodontinae. ''Concavodonta'' is known solely from late Ordovician, Caradoc epoch, fossils found in Europe and South America. The genus currently contains three accepted species, ''Concavodonta imbricata'', ''Concavodonta ovalis'' and the type species ''Concavodonta ponderata''. Description ''Concavodonta'' is a small bivalve which was first described in 1972 by Claude Babin and Michel Melou. Generally the shells of ''Concavodonta'' are fairly rounded to ovoid in shape. As the type genus for the subfamily Concavodontinae, the hinge displays the typical chevroning of teeth where the concavity in the chevron faces away from the center of the hinge and the umbo. The adductor muscles for the shell are unequal in shape. The external surface of the shells show regular concentric ornamentation. The type species for the genus, ''Concav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trigonoconcha
''Trigonoconcha'' is an extinct genus of bivalve in the extinct family Praenuculidae. The genus is one of eleven genera in the subfamily Praenuculinae. It is one of three Praenuculinae genera known solely from Late Ordivician, Caradoc epoch, fossils found in South America. ''Trigonoconcha'' currently contains a single accepted species, ''Trigonoconcha acuta''. Description ''Trigonoconcha acuta'' was first described in 1999 by Teresa M. Sánchez from fossils from sediments of the late Middle Ordivician, Caradocian aged Don Braulio Formation. The formation outcrops on the flank of Sierra de Villicum in the Argentina precordillera.The Paleobiology database "Sierra de Villicum" entry accessed 11 February 2012 The shells of ''Trigonoconcha'' ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuculoidea
Nuculoidea is a superfamily of bivalves. It belongs to the order Order, ORDER or Orders may refer to: * Categorization, the process in which ideas and objects are recognized, differentiated, and understood * Heterarchy, a system of organization wherein the elements have the potential to be ranked a number of d ... Nuculida. It comprises one living family, Nuculidae and one extinct family Praenuculidae. References Nuculida Mollusc superfamilies {{bivalve-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |