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Agnostidae
Agnostidae is a family of Agnostida trilobites. Like all Agnostina, they were eyeless and bore only two thoracic segments. They ranged in benthic waters across the globe from 508 to 461 million years ago, containing the following genera, among others: *'' Acmarhachis'' *''Agnostus ''Agnostus'' is a genus of agnostid trilobites, belonging to the family Agnostidae, that lived during the late Middle Cambrian – early Upper Cambrian (about 506 to 492 million years ago). It is the type genus of the family Agnostidae and is sub ...'' *'' Aistagnostus'' *'' Anglagnostus'' *'' Biciragnostus'' *'' Connagnostus'' *'' Distagnostus'' *'' Eolotagnostus'' *'' Gymnagnostus'' *'' Homagnostus'' *'' Idolagnostus'' *'' Innitagnostus'' *'' Ivshinagnostus'' *'' Kymagnostus'' *'' Lotagnostus'' *'' Micragnostus'' *'' Obelagnostus'' *'' Oncagnostus'' *'' Peronopsis'' *'' Phalacroma'' *'' Phalagnostus'' *'' Quadrahomagnostus'' *'' Raragnostus'' *'' Semagnostus'' *'' Strictagnostus'' *'' Trilobagnostu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agnostus
''Agnostus'' is a genus of agnostid trilobites, belonging to the family Agnostidae, that lived during the late Middle Cambrian – early Upper Cambrian (about 506 to 492 million years ago). It is the type genus of the family Agnostidae and is subdivided into two subgenera, ''Agnostus'' and ''Homagnostus''. Etymology ''Agnostus'' is from the Ancient Greek άγνωστος (''ágnostos'') "unknown", and reflects the fact that early paleontologists did not know what type of animal with which they were confronted. The species epithet has this origin: * ''pisiformis'' derives from the Latin ''pīsum'' which means "pea", and ''forma'' meaning "shape", for its globe-like appearance when rolled. Description ] Like all Agnostida, ''Agnostus'' is diminutive and the headshield (or Cephalon (arthropod head)#Trilobites, cephalon) and tailshield (or pygidium) are around the same size (or isopygous) and outline. As in all Agnostina, ''Agnostus'' has two thorax segments. When Agnostina ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Distagnostus
''Distagnostus'' is a genus of trilobite in the order Agnostida, which existed in what is now Queensland, Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma .... It was described by Shergold in 1972, and the type species is ''Distagnostus ergodes''. P.A. Jell and J.M. Adrain. References Agnostidae Agnostida genera[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Idolagnostus
''Idolagnostus'' is a genus of trilobite in the order Agnostida, which existed in what is now Queensland, Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma .... It was described by Öpik in 1967, and the type species is ''Idolagnostus agrestis''. P.A. Jell and J.M. Adrain. References Agnostidae Agnostida genera[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peronopsis
''Peronopsis'' (meaning "broach-like" or possibly "boot-like") is a genus of trilobite restricted to the Middle Cambrian. Its remains have been found in Asia, Australia, Europe, and North America. Etymology The subgenus ''Svenax'' is a contraction of Sven Axel, the given names of the paleontologist Tullberg. Taxonomy Position of ''Peronopsis palmadon'' ''Peronopsis palmadon'' is intermediate between Peronopsidae and Condylopygidae, but it is not clear whether ''P. palmadon'' is ancestral to the Condylopigidae, a condylopigid exhibiting regression towards ancestral characters, or an example of parallel evolution. Species previously assigned to ''Peronopsis'' * ''P. acadica'' = '' Acadagnostus acadicus'' * ''P. bifidus'' = '' Pseudoperonopsis bifidus'' * ''P. bonnerensis'' = '' Pentagnostus (Meragostus) bonnerensis'' * ''P. brunfloensis'' = '' Redeagnostus brunfloensis'' * ''P. bulkurensis'' = '' Pentagnostus (Meragostus) bulkurensis'' * ''P. columbensis'' = '' Pseudo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acmarhachis
''Acmarhachis'' is a genus of trilobite in the order Agnostida, which lived in what are now Australia (Queensland, Tasmania), Canada (British Columbia, Newfoundland, Northwest Territories), China (Anhui), Kazakhstan, Russia (Kharaulakh), and the US (Alaska, Alabama, Nevada, Maryland, Vermont). It was described by Resser in 1938, and the type species is ''Acmarhachis typicalis''. Distribution * ''A. typicalis'' occurs in the Cambrian of Kazakhstan (Kyrshabakty River, ''Lejopyge laevigata''-trilobite zone, Zhumabai Formation, Paibian and Cambrian Stage 9, 43.5° N, 70.0° E). * ''A. whittingtoni'' is known from the Upper Cambrian of Canada (Hickey Cove, ''Dunderbergia''-trilobite zone, Downes Point Member, Shallow Bay Formation, Paibian, Newfoundland, 49.8° N, 57.9° W). ''cited in'' Description Like all Agnostida, ''Acmarhachis'' is diminutive and the headshield (or cephalon) and tailshield (or pygidium) are of approximately the same size (or isopygous) and outline. As in a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lotagnostus
''Lotagnostus'' is a genus of very small trilobites in the order Agnostida, which lived on the outer continental shelves worldwide, during the late Upper Cambrian. It was described by Whitehouse in 1936, and the type species is ''Lotagnostus trisectus'', which was originally described as a species of ''Agnostus'' by Salter in 1864. Taxonomy The Treatise on Invertebrate Paleontology divides ''Lotagnostus'' into three subgenera that differ in the degree of effacement: ''L. (Lotagnostus)'' Whitehouse, 1936 (neither cephalon nor pygidium strongly effaced), ''L. (Distagnostus)'' Shergold, 1972 (strongly effaced on the outer/dorsal surface, but with clear furrows on the inner/ventral surface and ''L. (Eolotagnostus)'' Zhou ''in'' Zhiqiang Zhou, li & Qu, 1982 (with even the inner/ventral surface strongly effaced). Later authors however consider it likely that creating these subgenera would render the nominate subgenus paraphyletic. Biostratographic significance The first appearance ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Connagnostus
''Connagnostus'' is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived from 501 to 490 million years ago during the Dresbachian faunal stage of the late Cambrian Period The Cambrian Period ( ; sometimes symbolized C with bar, Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million .... References Agnostidae Fossils of Canada Cambrian trilobites Fossils of China Fossils of Kazakhstan Fossils of Russia Paleozoic life of Newfoundland and Labrador Paleozoic life of Yukon {{agnostida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eolotagnostus
''Eolotagnostus'' is a genus of trilobite in the order Agnostida, which existed in what is now Gansu, China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and .... It was described by Zhou in 1982, and the type species is ''Eolotagnostus gansuensis''. P.A. Jell and J.M. Adrain. References Agnostidae Fossils of China {{agnostida-stub ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gymnagnostus
''Gymnagnostus'' is a genus of trilobite in the order Agnostida, which existed in what is now Oaxaca Oaxaca ( , also , , from nci, Huāxyacac ), officially the Free and Sovereign State of Oaxaca ( es, Estado Libre y Soberano de Oaxaca), is one of the 32 states that compose the political divisions of Mexico, Federative Entities of Mexico. It is ..., Mexico. It was described by Robison and Pantoja-Alor, in 1968, and the type species is ''Gymnagnostus gongros''. P.A. Jell and J.M. Adrain. References Agnostidae Fossils of Mexico[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Homagnostus
''Homagnostus'' is a genus of trilobite in the order Agnostida, which existed in what is now north Wales Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the .... It was described by Howell in 1935. The genus was originally considered to be ''Agnostus pisiformis var. obesus'' (Belt, 1867). P.A. Jell and J.M. Adrain. References Agnostidae Fossils of Wales[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phalacroma
''Phalacroma'' is a genus of trilobite in the order Agnostida, which existed in what is now the Czech Republic The Czech Republic, or simply Czechia, is a landlocked country in Central Europe. Historically known as Bohemia, it is bordered by Austria to the south, Germany to the west, Poland to the northeast, and Slovakia to the southeast. The .... It was described by Hawle and Corda in 1867, and the type species is ''Phalacroma bibullatus'', which was originally described as a species of '' Battus'' by Barrande in 1846. P.A. Jell and J.M. Adrain. References Agnostidae[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Innitagnostus
''Innitagnostus'' is a genus of trilobite in the order Agnostida, which existed in what is now Queensland, Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma .... It was described by Öpik, 1967, and the type species is ''Innitagnostus innitens''. P.A. Jell and J.M. Adrain. References Agnostidae Agnostida genera[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |