|
Agnostid
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] |
Agnostida
Agnostida is an order of arthropod which have classically been seen as a group of highly modified trilobites, though some recent research has doubted this placement. Regardless, they appear to be close relatives as part of the Artiopoda. They are present in the Lower Cambrian fossil record along with trilobites from the Redlichiida, Corynexochida, and Ptychopariida orders, and were highly diverse throughout the Cambrian. Agnostidan diversity severely declined during the Cambrian-Ordovician transition, and the last agnostidans went extinct in the Late Ordovician. Systematics The Agnostida are divided into two suborders — Agnostina and Eodiscina — which are then subdivided into a number of families. As a group, agnostids are isopygous, meaning their pygidium is similar in size and shape to their cephalon. Most agnostid species were eyeless. The systematic position of the order Agnostida within the class Trilobita remains uncertain, and there has been continuing deb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trilobita
Trilobites (; meaning "three lobes") are extinction, extinct marine arthropods that form the class (biology), class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian Stage (geology), stage of the Early Cambrian Period (geology), period () and they flourished throughout the lower Paleozoic before slipping into a long decline, when, during the Devonian, all trilobite orders except the Proetida died out. The last extant trilobites finally disappeared in Permian–Triassic extinction event, the mass extinction at the end of the Permian about 252 million years ago. Trilobites were among the most successful of all early animals, existing in oceans for almost 270 million years, with over 22,000 species having been described. By the time trilobites first appeared in the fossil record, they were already highly diversified and geographically dispersed. Because trilobites had ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trilobite
Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period () and they flourished throughout the lower Paleozoic before slipping into a long decline, when, during the Devonian, all trilobite orders except the Proetida died out. The last extant trilobites finally disappeared in the mass extinction at the end of the Permian about 252 million years ago. Trilobites were among the most successful of all early animals, existing in oceans for almost 270 million years, with over 22,000 species having been described. By the time trilobites first appeared in the fossil record, they were already highly diversified and geographically dispersed. Because trilobites had wide diversity and an easily fossilized exoskeleton, they left an extensive fossil record. The stu ... [...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] |
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] |
Oncagnostus
''Oncagnostus'' is a genus of trilobite in the order Agnostida, which existed in what is now Shandong, China. It was described by Whitehouse in 1936, and the type species is ''Oncagnostus hoi'', which was originally described as a species of ''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 ...'' by Sun in 1924. P.A. Jell and J.M. Adrain. References Agnostidae[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Obelagnostus
''Obelagnostus'' is a genus of trilobite in the order Agnostida, which existed in what is now Antarctica Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean, it contains the geographic South Pole. Antarctica is the fifth-largest contine .... It was described by Shergold and Webers in 1992, and the type species is ''Obelagnostus imitor''. P.A. Jell and J.M. Adrain. References Agnostidae Trilobites of Antarctica {{agnostida-stub ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Micragnostus
''Micragnostus'' is a genus of trilobite in the order Agnostida, which existed in what is now north Wales. It was described by Howell in 1935, and the type species is ''Micragnostus calvus'', which was originally described as a species of ''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 ...'' by Lake in 1906. P.A. Jell and J.M. Adrain. References Agnostidae[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kymagnostus
''Kymagnostus'' is a genus of trilobite in the order Agnostida, which existed in what is now Arkansas, United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie .... It was described by Hohensee in 1989, and the type species is ''Kymagnostus harti''. P.A. Jell and J.M. Adrain. References Agnostidae Fossils of the United States {{agnostida- ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ivshinagnostus
''Ivshinagnostus'' is a genus of trilobite in the order Agnostida, which existed in what is now Kazakhstan Kazakhstan, officially the Republic of Kazakhstan, is a transcontinental country located mainly in Central Asia and partly in Eastern Europe. It borders Russia to the north and west, China to the east, Kyrgyzstan to the southeast, Uzbeki .... It was described by Ergaliev in 1980, and the type species is ''Ivshinagnostus ivshini''. P.A. Jell and J.M. Adrain. References Agnostidae Fossils of Kazakhstan {{agnostida-stub ...[...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] |
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] |
.jpg "Click for more on -> Trilobita")