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Yinoceratinae
Yinoceratinae is one of three subfamilies of the goniatitid ammonoid family Pseudohaloritidae Pseudohaloritidae is the larger of two families that form the goniatitid superfamily Pseudohaloritoidea, the other being the monogenerc Maximitidae. They are part of the vast array of shelled cephalopods known as ammonoids that are more closel .... References The Paleobiology Databaseaccessed on 10/01/07 Pseudohaloritidae {{Goniatitida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yinoceras
''Yinoceras'' is a genus of middle Permian goniatitid ammonite, the type genus for the subfamily Yinoceratinae of the family Pseudohaloritidae. The shell of ''Yinoceras'' is involute, small to intermediate in size, subglobular or thickly discoidal with a very small umbilicus, convex flanks, and rounded venter. The surface is usually marked by weak constrictions and is characterized at maturity by coarse transverse ribs that bifurcate or sometimes trifurcate. The siphuncle is proportionally large and retrochoanitic (meaning the septal necks point toward the beginning of the shell); ventro-marginal in the first whorl but then migrates rapidly to become dorsal. The suture is goniatitic. The retrochoanitic siphuncle is more usual for earlier, Devonian, ammonoids and is a characteristic of the Nautiloidea. The dorsal siphuncle, characteristic of the Upper Devonian Clymeniida Clymeniida is an order of ammonoid cephalopods from the Upper Devonian characterized by having an unusual ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudohaloritidae
Pseudohaloritidae is the larger of two families that form the goniatitid superfamily Pseudohaloritoidea, the other being the monogenerc Maximitidae. They are part of the vast array of shelled cephalopods known as ammonoids that are more closely related to squids, belemnites, octopuses, and cuttlefish, than to the superficially similar ''Nautilus''.The Paleobiology Database 11/17/09 The Pseudohaloritide which now contains some 14 genera in three subfamilies is characterized by small, subdiscoidal to subglobular, involute shells, the surface of which may be smooth or with coarse longitudinal lirae and/or transverse ribs. The is retrosiphonitic, a hold-over character from the |
Ruzhencev
Vasily Ermolaevich Ruzhentsev (russian: Василий Ермолаевич Руженцев, April 4, 1899 - October 12, 1978) was a Soviet paleontologist, malacologist and geologist. From 1937 to 1978 he worked at the Paleontological Institute of Russian Academy of Sciences The Paleontological Institute, Russian Academy of Sciences (PIN; russian: Палеонтологический институт РАН) in Moscow is among the world's largest paleontological institutes. An affiliate of the Russian Academy of Scienc .... He had 117 publications of which 17 were monographs. From 1966 to 1978 he was editor in chief of the Transactions of the Paleontological Institute. Sources * Leonova, T.P. (2009ВАСИЛИЙ ЕРМОЛАЕВИЧ РУЖЕНЦЕВ ‒ 110 ЛЕТСО ДНЯ РОЖДЕНИЯIn: Современные проблемы изучения головоногих моллюсков. Морфология, систематика, эволюция, экология и б ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subfamilies
In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus. Standard nomenclature rules end subfamily botanical names with "-oideae", and zoological names with "-inae". See also * International Code of Nomenclature for algae, fungi, and plants * International Code of Zoological Nomenclature * Rank (botany) * Rank (zoology) In biological classification, taxonomic rank is the relative level of a group of organisms (a taxon) in an ancestral or hereditary hierarchy. A common system consists of species, genus, family, order, class, phylum, kingdom, domain. While olde ... Sources {{biology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Goniatitida
Goniatids, informally goniatites, are Ammonoidea, ammonoid cephalopods that form the order Goniatitida, derived from the more primitive Agoniatitida during the Middle Devonian some 390 million years ago (around Eifelian stage). Goniatites (goniatitids) survived the Late Devonian extinction to flourish during the Carboniferous and Permian only to become Permian–Triassic extinction event, extinct at the end of the Permian some 139 million years later. Morphology All goniatites possessed an external shell, which is divided internally into chambers filled with gas giving it buoyancy during the life of the animal. An open chamber at the front of the shell provided living space for the goniatitid animal, with access to open water through a ventral siphuncle. The general morphology and habit of goniatites was probably similar to that of their later relatives the Ammonitida, ammonites, being free swimming and possessing a head with two well developed eyes and arms (or tentacles). G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |