|
List Of Prehistoric Jawless Fish
This list of prehistoric jawless fish is an attempt to create a comprehensive listing of all Genus, genera from the fossil record that have ever been considered to be jawless fish, excluding purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful (''nomen dubium, nomina dubia''), or were not formally published (''nomen nudum, nomina nuda''), as well as synonym (zoology), junior synonyms of more established names, and genera that are no longer considered agnathans. Modern forms are excluded from this list. Naming conventions and terminology Naming conventions and terminology follow the International Code of Zoological Nomenclature. Technical terms used include: * Synonym (zoology), Junior synonym: A name which describes the same taxon as a previously published name. If two or more genera are formally designated and the type (zoology), type specimens are later assigned to the same genus, the first to be publis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arandaspis Prionotolepis
''Arandaspis prionotolepis'' is an extinction, extinct species of Agnatha, jawless fish that lived in the Ordovician period, about 480 to 470 million years ago. Its remains were found in the Stairway Sandstone near Alice Springs, Australia in 1959, but it was not determined that they were the oldest known vertebrates until the late 1960s. ''Arandaspis'' is named after a local Indigenous Australians, Indigenous Australian people, the Aranda (now currently called Arrernte people, Arrernte). Description ''Arandaspis'' is estimated to reach around long, with a body covered in rows of knobbly armoured scutes. The front of the body and the head were protected by hard plates with openings for the eyes, nostrils and gills. It probably was a filter-feeder. The morphology of its trunk and tail is unknown. According to comparisons with other early ostracoderms, it would have lacked paired fins and the caudal fin would be of a simple shape, although another arandaspid ''Sacabambaspis'' had ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aserotaspis
''Aserotaspis'' is an extinct genus of jawless fish which existed in what is now northern Canada Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun .... by D.K. Elliott and E.J. Loeffler, 1988. It was first named by Dineley and Loeffler in 1976, and contains the species ''Aserotaspis canadensis''. References Heterostraci genera Fossils of Canada {{Devonian-jawless-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ariaspis
''Ariaspis'' is an extinct genus of cyathaspidiform heterostracan agnathan. Fossils are found in marine strata of Canada and Europe from the late Silurian period until its extinction during the Early Devonian The Devonian ( ) is a period (geology), geologic period and system (stratigraphy), system of the Paleozoic era (geology), era during the Phanerozoic eon (geology), eon, spanning 60.3 million years from the end of the preceding Silurian per .... A new species, ''A. arctata'', was described by David K. Elliott and Sandra Swift in 2010. References Cyathaspidiformes genera Devonian jawless fish Silurian jawless fish Silurian first appearances Early Devonian genus extinctions Cyathaspidida Silurian fish of North America Silurian fish of Europe Paleozoic life of the Northwest Territories {{Pteraspidomorphi-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archipelepis
''Archipelepis'' is a genus of extinct thelodont agnathans, and are the most primitive recognized thelodonts of which whole body fossils are known.Wilson, Mark VH, and Tiiu Märss. "Thelodont phylogeny revisited, with inclusion of key scale-based taxa." Estonian Journal of Earth Sciences 58.4 (2009): 297œ310/ref> Fossils of bodies and scales are currently known from Late Telychian to Wenlock-aged marine strata of northern Canada.Soehn, K. L., Märss, T., Caldwell, M. W. & Wilson, M. V. H., 2001: New and biostratigraphically useful thelodonts from the Silurian of the Mackenzie Mountains, Northwest Territories, Canada. Journal of Vertebrate Paleontology, 21: 651-65/ref> Anatomy Both species have similar body morphology, in that both resembled Tadpole, tadpoles with forked tails. Scale morphology differs in that ''A. bifurcata'' has forked scales with two prong-like spires, and that ''A. turbinata'' has bulbous, pointed scales that resemble upside-down spinning top A spin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arandaspis
''Arandaspis prionotolepis'' is an extinct species of jawless fish that lived in the Ordovician period, about 480 to 470 million years ago. Its remains were found in the Stairway Sandstone near Alice Springs, Australia in 1959, but it was not determined that they were the oldest known vertebrates until the late 1960s. ''Arandaspis'' is named after a local Indigenous Australian people, the Aranda (now currently called Arrernte). Description ''Arandaspis'' is estimated to reach around long, with a body covered in rows of knobbly armoured scutes. The front of the body and the head were protected by hard plates with openings for the eyes, nostrils and gills. It probably was a filter-feeder. The morphology of its trunk and tail is unknown. According to comparisons with other early ostracoderms, it would have lacked paired fins and the caudal fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Ap ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apedolepis
''Apedolepis'' (meaning "flat scale", from Greek ἄπεδοςi, ''apedos'', meaning 'even', 'flat', or 'level' and λεπίς, meaning 'scale') was an extinct genus of early jawless fish known from the Ordovician Stokes Formation of central Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl .... All existing material was collected in the Areyonga Creek section of the eastern Gardiner Range. ''Apedolepis'' is known solely from scales, with the type specimen (CPC 33630) consisting of a single scale.The scales of Apedolepis are characterized by an atubular laminar surface tissue of uncertain histology, lacking a distinct base.Turner, S. (2000). "Ordovician microvertebrate remains from the Amadeus Basin, central Australia." *Alcheringa: An Australasian Journal of Palaeontology* ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
