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Odontopleurida
Odontopleurida is an order (biology), order of very spinose trilobites closely related to the trilobites of the order Lichida. Some experts group the Odontopleurid families, Odontopleuridae and Damesellidae, within Lichida. Odontopleurids tend to have convex, bar-shaped cephalons, and lobed, knob-shaped glabella that extend to, or almost to the anterior margin. Many, if not almost all odontopleurids have long spines that are derived either from the margins of the exoskeleton, or from granular or tubercular ornamentation, or both. Many odontopleurids are so spinose so as to be described as having "spines on (their) spines." Odontopleurids have 8 to 13 thoracic segments, with Odontopleuridae odontopleurids having no more than 10, and Damesellidae odontopleurids having no more than 13. The pygidium tends to be very small, and invariably has long spines emanating from it in all known genera. Genera of Damesellidae are restricted to Middle to Upper Cambrian marine strata, and may ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ceratocephala (trilobite)
''Ceratocephala'' is a trilobite genus in the family Odontopleuridae. References External links Odontopleurida genera Odontopleuridae Ordovician trilobites of Europe Paleozoic life of Newfoundland and Labrador Paleozoic life of the Northwest Territories {{Odontopleurida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Odontopleuridae
Odontopleuridae is a family of odontopleurid trilobites found in marine strata throughout the world. Odontopleurids of Odontopleuridae first appear in Late Cambrian-aged marine strata, and the last genera perish by the end of the Frasnian stage during the Late Devonian. The members of Odontopleuridae are famous for their spinose appearance, having long, often numerous spines along the edges of their exoskeletons, and derived from ends of segments or tubercle ornaments. Genera Genera include *'' Acanthalomina'' *?'' Acidaspidella'' *?'' Acidaspides'' *'' Acidaspis'' *'' Anacaenaspis'' *'' Apianurus'' *'' Archaeopleura'' *'' Boedaspis'' *'' Borkopleura'' *'' Brutonaspis'' *'' Calipernurus'' *'' Ceratocara'' *'' Ceratocephala'' *'' Ceratocephalinus'' *'' Ceratonurus'' *'' Chlustinia'' *'' Dalaspis'' *'' Diacanthaspis'' *'' Dicranurus'' *'' Dudleyaspis'' *'' Edgecombeaspis'' *'' Eoleonaspis'' *'' Exallaspis'' *'' Gaotania'' *'' Globulaspis'' *'' Hispaniaspis'' *'' Isoprusia'' *'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dicranurus
''Dicranurus'' (Greek, 'dikranon', a pitchfork, and 'oura', tail) is a genus of Lower to Middle Devonian odontopleurid trilobites that lived in a shallow sea that lay between Euramerica and Gondwana, corresponding to modern-day Oklahoma and New York, and Morocco, respectively. As such, their fossils are found in New York, Oklahoma, and Morocco. Their bodies averaged about or so, in length, though their large spines made them at least in length. It is speculated that such tremendous spines hampered the ability of predators, such as arthrodire placoderms, to attack them, as well as to help prevent them from sinking into the soft mud of their environment. ''Dicranurus'' trilobites are distinguished from other odontopleurids by the pair of large, curled, horn-like spines that emanate from behind the glabellum. The genus name refers to these distinctive horns, in fact. In popular culture *''Dicranurus'' was an inspiration for an early version of an alien creature from the 2012 m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Damesellidae
Damesellidae is a family of odontopleurid trilobites found in late Middle to Late Cambrian marine strata, primarily of China. Damesellids are closely related to the odontopleurids of Odontopleuridae, but are not nearly as spinose, nor possess spines as exaggerated as Odontopleuridae. Like Odontopleuridae odontopleurids, damesellids have broad, bar-shaped cranidia with ledge-like borders. Damesellidae may represent transitional forms between more primitive, possibly ancestral ptychopariids and more advanced odontopleurids. Genera Genera include *?'' Adelogonus'' *'' Bergeronites'' *'' Blackwelderia'' *'' Blackwelderioides'' *'' Chiawangella'' *'' Cyrtoprora'' *'' Damesella'' *'' Damesops'' *'' Dipentaspis'' *'' Dipyrgotes'' *'' Neodrepanura'' *'' Duamsannella'' *'' Fengduia'' *'' Guancenshania'' *?'' Hercantyx'' *''Histiomona ''Histiomona'' is an extinct genus of damesellid odontopleurid trilobite. It lived from 501 to 490 million years ago during the Dresbachian faunal s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acidaspis
''Acidaspis'' is an extinct genus of odontopleurid trilobite from the Ordovician to Silurian of North America and Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia .... Although small, it had long spines along its body. Reassigned species *''Acidaspis emarginata'' = '' Anabaraspis emarginata'' References Odontopleuridae Odontopleurida genera Ordovician trilobites of North America Silurian trilobites of Europe Silurian trilobites of North America Paleontology in Ohio Paleontology in New York (state) Paleozoic life of Ontario Paleozoic life of the Northwest Territories Paleozoic life of Nunavut Paleozoic life of Quebec {{Odontopleurida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dudleyaspis
''Dudleyaspis'' is an extinct genus of Lower to Middle Devonian odontopleurid trilobites that lived in a shallow sea that lay between Euramerica and Gondwana.Ramsköld, L. (1984). Silurian Odontopleurid trilobites from Gotland. ''Palaeontology'' 27, 2, 239–264. It was named in 1949 by Prantl & Pribyl. Fossils of ''Dudleyaspis'' have been found in the following locations: *Australia: Bathurst ( Jesse Limestone), Mudgee ( Flirtation Hill) and Murrumbateman ( Black Bog Formation – Yarwood Siltstone Member) *Canada: Northwest Territories (Mackenzie Mountains – Delorme and Whittaker Formations) and Nunavut ( Bailie-Hamilton and Cornwallis Islands – Cape Phillips Formation) *Czech Republic: Prague (Loc. 5.2 – C. colonus Zone) *England: Cannock ( Shelve District) and Dudley (Wren's Nest – Much Wenlock Limestone Formation) *France: Coumiac (Coumiac quarry – Coumiac Formation) *Sweden: western Gotland (Visby – Rönnklint sea cliff and Kättelviken) *United States: Il ... [...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] |
Lichida
Lichida is an order of typically spiny trilobite that lived from the Furongian to the Devonian period. These trilobites usually have 8–13 thoracic The thorax or chest is a part of the anatomy of humans, mammals, and other tetrapod animals located between the neck and the abdomen. In insects, crustaceans, and the extinct trilobites, the thorax is one of the three main divisions of the crea ... segments. Their exoskeletons often have a grainy texture or have wart or spine-like tubercles. Some species are extraordinarily spiny, having spiny thoracic segments that are as long or longer than the entire body, from cephalon (head) to pygidium (tail). The sections of the pygidia are leaf-like in shape and also typically end in spines. The order is divided into two families, Lichidae, and Lichakephalidae. Some experts group the families of the closely related order Odontopleurida within Lichida, too, whereupon the family is then divided into three superfamilies, Dameselloidea, con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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