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Anglaspis
''Anglaspis'' is an extinct genus of cyathaspidiform heterostracan agnathan. Fossils are found in marine strata of Europe, from the late Silurian period until the genus' extinction during the Early Devonian. As with other cyathaspidiforms, individuals of ''Anglaspis'' had dorsal and ventral plates covering the forebody, gill pouches, and nasal openings that lay on the roof of the oral cavity. Late Silurian species of ''Anglaspis'' are found in marine strata of Wales and England, while most of the Early Devonian species are found in the Devonian-aged strata of Spitsbergen island, in Svalbard, Norway. Taxonomy ''Anglaspis'' was, at various times, placed in the families Cyathaspididae, Poraspididae, and in its own family, Anglaspididae. Currently, it is placed in Ariaspidae with ''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 extinct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anglaspis Macculloughi
''Anglaspis'' is an extinct genus of cyathaspidiform heterostracan agnathan. Fossils are found in marine strata of Europe, from the late Silurian period until the genus' extinction during the Early Devonian. As with other cyathaspidiforms, individuals of ''Anglaspis'' had dorsal and ventral plates covering the forebody, gill pouches, and nasal openings that lay on the roof of the oral cavity. Late Silurian species of ''Anglaspis'' are found in marine strata of Wales and England, while most of the Early Devonian species are found in the Devonian-aged strata of Spitsbergen island, in Svalbard, Norway. Taxonomy ''Anglaspis'' was, at various times, placed in the families Cyathaspididae, Poraspididae, and in its own family, Anglaspididae. Currently, it is placed in Ariaspidae with ''Ariaspis'', and '' Listraspis'', and is considered to be closely related to, if not the progenitor of ''Liliaspis'' and ''Paraliliaspis ''Paraliliaspis egregia'' is an extinct cyathaspidifor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ariaspidae
Ariaspidae is a family of extinct cyathaspidiform heterostracan agnathans in the suborder Cyathaspidida. Family Ariaspidae contains ''Ariaspis'', and its sister-taxa originally contained within Anglaspididae/Anglaspidinae, including ''Anglaspis ''Anglaspis'' is an extinct genus of cyathaspidiform heterostracan agnathan. Fossils are found in marine strata of Europe, from the late Silurian period until the genus' extinction during the Early Devonian. As with other cyathaspidiforms, i ...'', '' Listraspis'', '' Liliaspis'', and '' Paraliliaspis''.Lundgren, Mette, and Henning Blom. "Phylogenetic relationships of the cyathaspidids (Heterostraci)." GFF 135.1 (2013): 74-84. References * Phylogenetic patterns in the heterostracan families Cyathaspidae, Ariaspidae and Ctenaspidae. Lundgren Mette and Blom Henning, The 2nd Wiman meeting : Carl Wiman's Legacy: 100 years of Swedish Palaeontology : Uppsala 17–18 November 2011, 16-17 p. Cyathaspidida Prehistoric jawless fish ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyathaspidiformes
Cyathaspidiformes is an extinct order of heterostracan vertebrates known from extensive fossil remains primarily from Silurian to Early Devonian strata of Europe, and North America, and from Early Devonian marine strata of Siberia. Anatomy Like their descendants, the pteraspidids, all cyathaspidiform heterostracans had the cephalothorax enclosed in armor, formed from several plates, including dorsal, ventral, a dorsal spine derived from a scale, and a large, scale-covered tail. Thus, the living animals would have resembled tadpoles encased in massive armor. The majority of taxa have the rostral and pineal plates fused or merged with the dorsal plate, and in the amphiaspidids, all the plates of the cephalothorax were fused together into a single "muff-like" unit. Unlike the pteraspidids, all cyathaspidiforms are thought to be almost uniformly benthic in lifestyle, though only the amphiaspids and the ctenaspids are thought to be burrowers. Taxonomy The taxonomy of Cyathaspidifo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paraliliaspis
''Paraliliaspis egregia'' is an extinct cyathaspidiform heterostracan agnathan from early Devonian marine strata of the Ural Mountains. ''Paraliliaspis'' was, at various times, placed in the families Cyathaspididae, and Anglaspididae. Currently, it is placed in Ariaspidae with ''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 geolog ...'', and '' Listraspis'', and is considered to be closely related to the similar-looking '' Liliaspis'', which is also from Early Devonian Ural marine strata. ''Anglaspis'' is considered the ancestor or sister-taxon of both ''Liliaspis'' and ''P. egregia''. References Cyathaspidiformes genera Early Devonian fish of Europe Cyathaspidida {{Pteraspidomorphi-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heterostraci
Heterostraci (Ancient Greek, ἕτερος+ὄστρακον "those itha different shell" i is pl. of -us is an extinct subclass of pteraspidomorph jawless vertebrate that lived primarily in marine and estuary environments. Heterostraci existed from the mid-Ordovician to the conclusion of the Devonian. Description and anatomy The Heterostracans differed from other Paleozoic agnathan taxa both in the arrangement and histology of their scales. Most heterostracans had two plates which form a large dorsal shield and a large ventral shield, and had series of scales arranged in various patterns on the sides of their bodies, the exact pattern differing from one group to another. In a few primitive forms, such as '' Lepidaspis'', the dorsal and ventral shields are composed of a mosaic of tiny scales. In most other known forms, though, these tiny scales have fused together to form the shield-plates. The scales of heterostracans are histologically distinct from other vertebrate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyathaspidiformes
Cyathaspidiformes is an extinct order of heterostracan vertebrates known from extensive fossil remains primarily from Silurian to Early Devonian strata of Europe, and North America, and from Early Devonian marine strata of Siberia. Anatomy Like their descendants, the pteraspidids, all cyathaspidiform heterostracans had the cephalothorax enclosed in armor, formed from several plates, including dorsal, ventral, a dorsal spine derived from a scale, and a large, scale-covered tail. Thus, the living animals would have resembled tadpoles encased in massive armor. The majority of taxa have the rostral and pineal plates fused or merged with the dorsal plate, and in the amphiaspidids, all the plates of the cephalothorax were fused together into a single "muff-like" unit. Unlike the pteraspidids, all cyathaspidiforms are thought to be almost uniformly benthic in lifestyle, though only the amphiaspids and the ctenaspids are thought to be burrowers. Taxonomy The taxonomy of Cyathaspidifo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyathaspidida
Cyathaspidida is a taxon of extinct cyathaspidiform heterostracan agnathans whose fossils are found in Silurian to Lower Devonian marine strata of Europe and North America.Lundgren, Mette, and Henning Blom. "Phylogenetic relationships of the cyathaspidids (Heterostraci)." GFF 135.1 (2013): 74-84. In life, they are thought to be benthic animals that lived most of their lives either mostly buried in or resting directly on top of the substrate. Taxonomy The cyathaspidids of Cyathaspidida were tadpole-like animals with drum-shaped, cigar-shaped or wedge-shaped cephalothoraxes, and were anatomically similar to several other heterostracan groups. However, with some groups, such as the traquairaspids, cardiopeltids, and corvaspidids, this similarity appears to be superficial. With other groups, namely the tolypelepidids, the similarity suggests a close relationship. The type genus of the tolypelepidids, '' Tolypelepis'', in particular, was determined to be the sister-taxon of Cya ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liliaspis
''Liliaspis philippovae'' is an extinct cyathaspidiform heterostracan agnathan from early Devonian marine strata of the Ural Mountains. ''Liliaspis'' was, at various times, placed in the families Cyathaspididae, Poraspididae, and Anglaspididae. Currently, it is placed in Ariaspidae with ''Ariaspis'', and '' Listraspis'', and is considered to be closely related to the similar-looking ''Paraliliaspis''. ''Anglaspis ''Anglaspis'' is an extinct genus of cyathaspidiform heterostracan agnathan. Fossils are found in marine strata of Europe, from the late Silurian period until the genus' extinction during the Early Devonian. As with other cyathaspidiforms, i ...'' is considered the ancestor or sister-taxon of both ''L. philippovae'' and ''Paraliliaspis''. References Cyathaspidiformes genera Early Devonian fish of Europe Cyathaspidida {{Pteraspidomorphi-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norway
Norway, officially the Kingdom of Norway, is a Nordic country in Northern Europe, the mainland territory of which comprises the western and northernmost portion of the Scandinavian Peninsula. The remote Arctic island of Jan Mayen and the archipelago of Svalbard also form part of Norway. Bouvet Island, located in the Subantarctic, is a dependency of Norway; it also lays claims to the Antarctic territories of Peter I Island and Queen Maud Land. The capital and largest city in Norway is Oslo. Norway has a total area of and had a population of 5,425,270 in January 2022. The country shares a long eastern border with Sweden at a length of . It is bordered by Finland and Russia to the northeast and the Skagerrak strait to the south, on the other side of which are Denmark and the United Kingdom. Norway has an extensive coastline, facing the North Atlantic Ocean and the Barents Sea. The maritime influence dominates Norway's climate, with mild lowland temperatures on the se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Natural History Museum At The University Of Oslo
The Natural History Museum at the University of Oslo ( no, Naturhistorisk museum, NHM) is Norway's oldest and largest museum of natural history. It is situated in the neighborhood of Tøyen in Oslo, Norway. It traces its roots to the University Botanical Garden, which was founded near Tøyen Manor in 1814. Museums for zoology, botany and geology were added approximately a hundred years later, when the university campus in central Oslo had become too small for such purposes. Major proponents were Waldemar Christofer Brøgger and Nordal Wille. For most of the twentieth century the museums and botanical garden were organized in five different entities; these were merged on 1 August 1999. The current name dates from 2005. The Zoological Museum displaying wildlife from Norway as well as the rest of the world. The Botanical Garden contains 35,000 plants, 7,500 species and two exhibition greenhouses. The Geological Museum contain research material of more than 2 million fossils ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyathaspidae
Cyathaspididae is an extinct family in the heterostracan order Cyathaspidiformes.The Classification and Evolution of the Heterostraci. L. Beverly Tarlo, Acta Palaeontologica Polonica, 1962 Cyathaspididae contains most of the genera originally contained within Cyathaspididae, as well as those genera contained within Irregularaspididae, and Poraspididae. In addition to the type genus, †''Cyathaspis'', Cyathaspididae contains the following genera: †'' Americaspis'', †'' Archegonaspis'', †'' Capitaspis'', †'' Dikenaspis'', †'' Dinaspidella'', †'' Homaspidella'', †'' Irregulareaspis'', †'' Nahanniaspis'', †'' Pionaspis'', †''Poraspis ''Poraspis'' is an extinct genus of heterostracan. Fossils are found in Late Silurian and Early Devonian marine strata of Norway, Canada and the United States The United States of America (U.S.A. or USA), commonly known as the United ...'', †'' Ptomaspis'', †'' Seretaspis'', †'' Steinaspis'', †'' Torpedaspis'' ... [...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 geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, whe .... 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] |
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