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Svenax
''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'' = '' Pseu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peronopsidae
The Peronopsidae (which may also be called peronopsids) comprise the earliest family of the Agnostina suborder. Species of this family occurred on all Supercontinent, paleocontinents. The earliest representatives of this family first occur just before the start of the Middle Cambrian, and the last disappeared just after the start of the Upper Cambrian. Distribution Peronopsidae are Cosmopolitan distribution, cosmopolitan. Temporal distribution Temporal distribution: * ''Archaeagnostus'', Toyonian (Trilobite zone#Subdivision of the Olenellus-zone, ''Nephrolenellus multinodus''-zone) and Amgan, Amgaian (''Trilobite zone, Ovatoryctocara''-zone). * ''Eoagnostus'', Toyonian (''Nephrolenellus multinodus''-zone) and Amgaian (''Ovatoryctocara''-zone). * ''Peronopsis, Peronopsis (Proacadagnostus)'', Amgaian (''Ovatoryctocara''- and lower ''Kounamkites''-zones). * ''Diplorrhina'', Amgaian (''Ovatoryctocara''- and ''Kounamkites''-zones) * ''Peronopsis, Peronopsis (Peronopsis)'', Amgaian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diplorrhina
''Diplorrhina'' Hawle and Corda (1847) is a genus of trilobite belonging to Order Agnostida. It lived during the early Middle Cambrian ( Amgan and Mayan stages) in what are now the Czech Republic and the North Siberian plateau. as in members of the family Peronopsidae The Peronopsidae (which may also be called peronopsids) comprise the earliest family of the Agnostina suborder. Species of this family occurred on all Supercontinent, paleocontinents. The earliest representatives of this family first occur just be ... it lacks a preglabellar furrow. Both cephalon and pygidium lack spines. It is difficult to distinguish ''Diplorrhina'' from many other peronopsids. Taxonomy The ancestor of ''Diplorrhina'' is most likely one of the Siberian species of the genus '' Archaeagnostus''. ''D. recta'' is the most primitive species and it gave rise to ''D. cuneifera'', which was in turn ancestral to ''Diplorrhina triplicata''. Species previously assigned to ''Diplorrhina'' * ''D. norma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mayan Stage
The Cambrian Period ( ; sometimes symbolized 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 years ago (mya) to the beginning of the Ordovician Period mya. Its subdivisions, and its base, are somewhat in flux. The period was established as "Cambrian series" by Adam Sedgwick, who named it after Cambria, the Latin name for 'Cymru' (Wales), where Britain's Cambrian rocks are best exposed. Sedgwick identified the layer as part of his task, along with Roderick Murchison, to subdivide the large "Transition Series", although the two geologists disagreed for a while on the appropriate categorization. The Cambrian is unique in its unusually high proportion of sedimentary deposits, sites of exceptional preservation where "soft" parts of organisms are preserved as well as their more resistant shells. As a result, our understanding of the Cambrian biol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Itagnostus
''Itagnostus'' is a genus of trilobite restricted to the Middle Cambrian. Its remains have been found in Asia, Australia, Europe, and North America. Distribution * ''Itagnostus elkedrensis'' occurs in the Middle Cambrian of Australia (''Ptychagnostus praecurrens''-zone, ''Xystridura templetonensis''-zone, and ''Dinesus''-stage, Elkedra; ''Triplagnostus gibbus''-zone, Sandover Beds; both Northern Territory), the Russian Federation (''Kounamkites''-zone, Nekekit River; ''Liostracus allachjunensis''-zone, Lena River). * ''Itagnostus comis'' is found in the Middle Cambrian of Australia (''Triplagnostus gibbus''-zone, Sandover Beds, Northern Territory). * ''Itagnostus gaspensis gaspensis'' is reported from the Middle Cambrian of the United States (Geddes Formation, Nevada; ''Ptychagnostus atavus''-zone, Wheeler Formation, Drum Mountains, Utah), Canada (upper part, Grosses Roches, St. Laurence, Quebec), Russian Federation (''Tomagnostus fissus''-zone, Lena River). * ''Itagnostus g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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'' *'' Aistagnostus'' *''Anglagnostus'' *''Biciragnostus'' *''Connagnostus'' *''Distagnostus'' *''Eolotagnostus'' *''Gymnagnostus'' *''Homagnostus'' *''Idolagnostus'' *''Innitagnostus'' *''Ivshinagnostus'' *''Kymagnostus'' *''Lotagnostus'' *''Micragnostus'' *''Obelagnostus'' *''Oncagnostus'' *''Peronopsis'' *''Phalacroma'' *''Phalagnostus'' *''Quadrahomagnostus ''Quadrahomagnostus'' is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. They lived from 501 to 490 million years ago during the Dresbachian faunal stage of the late Cambrian period The Cambrian Period ...'' *'' Raragnostus'' *'' Semagnostus'' *'' Strictagnostus'' *'' Trilobagnostus'' References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archaeagnostus
''Archaeagnostus'' is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived from the terminal Toyonian Cambrian Stage 4 is the still unnamed fourth stage of the Cambrian and the upper stage of Cambrian Series 2. It follows Cambrian Stage 3 and lies below the Wuliuan. The lower boundary has not been formally defined by the International Commissi ... to early Amgaian. Species belonging to this genus have been found in Eastern North America, Newfoundland, the Henson Gletscher Formation in Greenland, the Nekekit and Molodo Rivers in Eastern Siberia, and in Guizhou, China. References Cambrian trilobites of North America Peronopsidae Agnostida genera Extinct animals of North America Cambrian trilobites of Asia Paleozoic life of Quebec {{agnostida-stub Cambrian genus extinctions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quadragnostus
''Quadragnostus'' is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the Cambrian Period The Cambrian Period ( ; sometimes symbolized 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 years ago (m ..., which lasted from approximately 539 to 485 million years ago. References Cambrian trilobites Peronopsidae Agnostida genera {{agnostida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentagnostus
''Pentagnostus'' is a genus of trilobites restricted to the Middle Cambrian. Its remains have been found in Siberia, Australia, North America, Scandinavia, and Kazakhstan. Taxonomy The probable ancestor of ''Pentagnostus'' is Archaeagnostus. Two subgenera can be distinguished. The nominate subgenus occurred first and developed into the later subgenus ''Pentagnostus (Meragnostus)'' and the family Ptychagnostidae. Species and distribution Subgenus ''Pentagnostus (Pentagnostus)'' * ''P. anabarensis'' Lermontova, 1940 (type) * ''P. ademptus'' (Prokovskaya and Jegorova, 1972) * ''P. brighamensis'' (Resser, 1938) * ''P. shergouldi'' Laurie, 2004 * ''P. veles'' Öpik, 1979 synonym ''P. endemicus''. Subgenus ''Pentagnostus (Meragnostus)'' * ''P. bonnerensis'' (Resser, 1939) (type Type may refer to: Science and technology Computing * Typing, producing text via a keyboard, typewriter, etc. * Data type, collection of values used for computations. * File type * TYPE (DOS comma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
