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Synechodontiformes
Synechodontiformes is an extinct order of prehistoric sharks, known from the Permian to the Paleogene. They are considered to be members of Neoselachii, the group that contains modern sharks and rays. Their placement in the group is uncertain, some authors have considered them to be galeomorph crown-group sharks, while others have considered them to represent a stem-group to modern sharks. They have sometimes been considered a paraphyletic grouping, but Klug (2010) recovered the group as monophyletic. Members of the clade are united by two synapomorphies, "pseudopolyaulacorhize tooth root pattern present; labial root depression in basal view present". The oldest possible member of the clade are teeth from the early Permian (Cisuralian) of the Ural Mountains. Taxonomy Primarily after Klug (2010) * † Orthacodontidae de Beaumont, 1960 ** †'' Sphenodus'' Agassiz, 1843 Early Jurassic - Paleocene **†'' Occitanodus'' Guinot, Cappetta & Adnet, 2014, France, Early Cretaceous (Va ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhomphaiodon
''Rhomphaiodon'' is an extinct genus of prehistoric sharks in the order Synechodontiformes that has been found in Late Triassic and Early Jurassic deposits located in Europe.G. Cuny and S. Risnes. 2005. The Enameloid Microstructure of the Teeth of Synechodontiform Sharks (Chondrichthyes: Neoselachii). ''PalArch'' 3(2):9-19 The type species ''R. minor'' was originally named as a species of ''Hybodus'' in 1837 by Louis Agassiz. A second species, ''R. nicolensis'', was added when the genus was named in 1993.C. J. Duffin. 1993. Late Triassic sharks teeth (Chondrichthyes, Elasmobranchii) from Saint-Nicolas-de-Port (north-east France). ''Belgian Geological Survey, Professional Paper, Elasmobranches et Stratigraphie'' 264(1993):7-32 Fossil distribution Fossils of ''Rhomphaiodon'' have been found in: ;Triassic * Grès de Mortinsart Formation, Norian-Rhaetian Belgium (''R. minor'') * Sables de Mortinsart Formation, Norian Belgium (''R. minor'') *near Saint-Laurent-du-Var, Rhaetian Fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neoselachii
Elasmobranchii () is a subclass of Chondrichthyes or cartilaginous fish, including sharks (superorder Selachii), rays, skates, and sawfish (superorder Batoidea). Members of this subclass are characterised by having five to seven pairs of gill clefts opening individually to the exterior, rigid dorsal fins and small placoid scales on the skin. The teeth are in several series; the upper jaw is not fused to the cranium, and the lower jaw is articulated with the upper. The details of this jaw anatomy vary between species, and help distinguish the different elasmobranch clades. The pelvic fins in males are modified to create claspers for the transfer of sperm. There is no swim bladder; instead, these fish maintain buoyancy with large livers rich in oil. The definition of the clade is unclear with respect to fossil chondrichthyans. It has been used by different authors as equivalent to Neoselachii (the clade including modern sharks and rays and their last common ancestor) or for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macrourogaleus
''Macrourogaleus'' is a genus of Palaeospinacidae, palaeospinacid shark from the Late Jurassic Solnhofen Limestone. It is probably related to ''Paraorthacodus'' due anatomical similarities seen in whole-body fossils of both genera. References External links * Prehistoric shark genera Jurassic sharks Palaeospinacidae Prehistoric cartilaginous fish genera Fossils of Germany {{paleo-cartilaginous-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Synechodus
''Palaeospinax'' is an extinct genus of shark which lived from the Early Triassic to the end of the Eocene epoch. Although several species have been described, the genus is considered ''nomen dubium'' because the type-specimen of the type species In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specimen( ..., ''Palaeospinax priscus'', lacks appropriate diagnostic characters to define the genus. Other species originally described as ''Synechodus'' were transferred to the genus '' Palidiplospinax''. References Further reading * {{Taxonbar, from=Q2308151, from2=Q22114365 Palaeospinacidae Prehistoric shark genera Triassic sharks Jurassic sharks Cretaceous sharks Paleocene sharks Eocene sharks Prehistoric fish of Europe Nomina dubia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orthacodontidae
Orthacodontidae is an extinct family of sharks in the order Synechodontiformes. It contains twelve species within three genera. Some authors included it into Hexanchiformes or Lamniformes. Species * '' Occitanodus'' Guinot, Cappetta & Adnet, 2014 ** '' Occitanodus sudrei'' Guinot, Cappetta & Adnet, 2014 * '' Orthacodus'' Woodward, 1889 ** '' Orthacodus longidens'' Agassiz, 1843 * '' Sphenodus'' Agassiz, 1843 ** '' Sphenodus alpinus'' Gümbel, 1861 ** '' Sphenodus longidens'' Agassiz, 1843 ** '' Sphenodus lundgreni'' Davis, 1890 ** '' Sphenodus macer'' Quenstedt, 1852 ** '' Sphenodus nitidus'' Wagner, 1862 ** '' Sphenodus planus'' Agassiz Jean Louis Rodolphe Agassiz ( ; ) FRS (For) FRSE (May 28, 1807 – December 14, 1873) was a Swiss-born American biologist and geologist who is recognized as a scholar of Earth's natural history. Spending his early life in Switzerland, he rec ..., 1843 ** '' Sphenodus rectidens'' Emmons, 1858 ** '' Sphenodus robustidens'' Seguenza, 190 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palaeospinacidae
Paleospinacidae is an extinct family of prehistoric sharks in the extinct order Synechodontiformes. References External links Prehistoric cartilaginous fish families Permian first appearances Paleogene extinctions {{paleo-shark-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Cartilaginous Fish Orders
Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared 5000 years ago. It took thousands of years for writing systems to be widely adopted, with writing spreading to almost all cultures by the 19th century. The end of prehistory therefore came at very different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. In the early Bronze Age, Sumer in Mesopotamia, the Indus Valley Civilisation, and ancient Egypt were the first civilizations to develop their own scripts and to keep historical records, with their neighbors following. Most other civilizations reached the end of prehistory during the following Iron Age. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
