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Buchanosteid
Buchanosteidae is a family of arthrodire placoderms that lived from the Early to Middle Devonian.White, E. I. (1952). Australian arthrodires. ''Bulletin of the British Museum (Natural History) (Geology)'' 1: 249–304. Fossils appear in various strata in Russia, Central Asia, Australia, and China. All buchanosteids tend to have flattened (of varying degrees depending on the genus) heads, with most genera also having large orbits. Genera ''Arenipiscis'' From the Emsian of New South Wales, it is known from several scrappy remains. It had a narrow skull, and the dermal surfaces of the bony armor were covered in a pattern of fine, granular tubercles. ''Buchanosteus'' The type genus, species are found in Emsian-aged strata in Australia, China, and Kazakhstan. ''Errolosteus'' One of several Taemas-Weejasper buchanosteid genera, ''Errolosteus'' had a comparatively broad, short skull. ''Exutaspis'' A "giant" buchanosteid from Emsian-aged strata in China. The holotype, an endocran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taemasosteus
''Taemasosteus'' is an extinct genus of arthrodire placoderm. Its fossils have been found in Emsian-aged marine strata in New South Wales, Australia. It contains two species, ''T. novaustrocambricus'', and ''T. maclartiensis''. The genus (and a monotypic family, "Taemasosteidae") was originally erected on the basis of "an imperfect" paranuchal, though, more specimens were found, eventually leading "Taemasosteidae" to be subsumed into Buchanosteidae. Even so, the reconstructed anatomy leads some researchers to conclude that ''Taemasosteus'' is close to the ancestry of Homostiidae. These researchers place ''Taemasosteus'' as the sister taxon of Homostiidae (or a select group of the better known homostiid genera) within the taxon In biology, a taxon (back-formation from ''taxonomy''; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular nam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Narrominaspis
''Narrominaspis longi'' is an extinct buchanosteid arthrodire placoderm. Its fossils, and those of the acanthothoracid, '' Connemarraspis'', have been found in the late Lochkovian-aged marine strata of the Connemarra Formation in Australia. It is considered a basal Basal or basilar is a term meaning ''base'', ''bottom'', or ''minimum''. Science * Basal (anatomy), an anatomical term of location for features associated with the base of an organism or structure * Basal (medicine), a minimal level that is nec ... buchanosteid. References Buchanosteidae Placoderms of Australia {{Placoderm-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exutaspis
''Exutaspis megista'' is an extinct, "giant" buchanosteid arthrodire placoderm. Its fossils have been found in the Late Emsian-aged marine strata of the Jiucheng and Haikou Formations in Wuding, Yunnan. It was originally described as a phlyctaeniid. Later, after comparison with the Chinese ''Buchanosteus ''Buchanosteus'' is an extinct genus of arthrodire placoderm. Its fossils have been found in Early Devonian-aged marine strata throughout Asia and Australia. It contains the following species: *''B. confertituberculatus'', the type species, is ... guanxianesis'', ''Exutaspis'' was reappraised as a buchanosteid. The holotype, a "head roof," is long. References Buchanosteidae Placoderms of Asia {{Placoderm-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buchanosteus
''Buchanosteus'' is an extinct genus of arthrodire placoderm. Its fossils have been found in Early Devonian-aged marine strata throughout Asia and Australia. It contains the following species: *''B. confertituberculatus'', the type species, is known from several specimens found from the Emsian-aged Taemas-Weejasper Reef in what is now New South Wales, Australia. It coexisted sympatrically with other buchanosteid genera there. *''B. guangxianensis'' is known primarily from a well-preserved, albeit incomplete endocranium from Pragian-aged deposits near Guangxi, China. It is compared to another buchanosteid, the "giant" '' Exutaspis'' from the late Emsian Wuding Formation in Yunnan. *''B. nuricus'' is known from one or two specimens from Emsian strata in the Qaranghandy Region in Kazakhstan, and named for the Nura River The Nura ( kk, Нұра, ''Nura''; russian: Нура) is a major watercourse of northeast-central Kazakhstan. It is long and drains an area of . Course The riv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Errolosteus
''Errolosteus goodradigbeensis'' is an extinct buchanosteid arthrodire placoderm. Its fossils have been found in Emsian-aged marine strata of New South Wales, 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 .... The holotype of ''E. goodradigbeensis'' was described at the same as its sympatric relative, '' Arenipiscis''. ''Errolosteus'' can be distinguished by having a comparatively short, broad skull. References Buchanosteidae Placoderms of Australia {{Placoderm-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Burrinjucosteus
''Burrinjucosteus asymmetricus'' is an extinct buchanosteid arthrodire placoderm. Its fossils have been found in Emsian-aged marine strata of New South Wales, 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 .... ''B. asymmetricus'' is known from scraps of thoracic armor and the skullroof, which suggest a very large, flat animal. References Buchanosteidae Prehistoric fish of Australia {{Placoderm-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Goodradigbeeon
''Goodradigbeeon'' is an extinct genus of buchanosteid arthrodire placoderm. Its fossils have been found in Emsian-aged marine strata from the Taemas-Wee Jasper reef of New South Wales, 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 ... and the type species is ''G. australianum''. The holotype was discovered near the Goodradigbee River by Harry A. Toombs and was described by White (1978).White, E. I. (1978). The larger arthrodiran fishes from the area of Burrinjuck Dam, N. S. W. ''Transactions of the Zoological Society of London'' 34: 149–262. References Buchanosteidae Placoderms of Australia Fossil taxa described in 1978 {{Placoderm-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arenipiscis
''Arenipiscis westolli'' is an extinct buchanosteid arthrodire placoderm. Its fossils have been found in Emsian-aged marine strata of New South Wales, 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 .... The generic name, meaning "sand fish," refers to how the dermal surfaces of the armor have a pattern of tiny bumps, creating a granular texture. References Buchanosteidae Placoderms of Australia {{Placoderm-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parabuchanosteus
''Parabuchanosteus murrumbidgeensis'' is an extinct buchanosteid arthrodire placoderm. Its fossils have been found in the Late Emsian-aged marine strata of New South Wales, Australia. It was originally described as ''Buchanosteus ''Buchanosteus'' is an extinct genus of arthrodire placoderm. Its fossils have been found in Early Devonian-aged marine strata throughout Asia and Australia. It contains the following species: *''B. confertituberculatus'', the type species, is ... murrumbidgeensis'' in 1952. Twenty years later, it was reexamined and promoted to a new genus. References Buchanosteidae Placoderms of Australia {{Placoderm-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Placodermi
Placodermi (from Greek πλάξ 'plate' and δέρμα 'skin', literally 'Plate (animal anatomy), plate-skinned') is a Class (biology), class of armoured prehistoric fish, known from fossils, which lived from the Silurian to the end of the Devonian period. Their head and thorax were covered by articulated armoured plates and the rest of the body was scale (zoology), scaled or naked, depending on the species. Placoderms were among the first jawed fish; their Fish jaw, jaws likely evolved from the first of their gill arches. Placoderms are thought to be paraphyly, paraphyletic, consisting of several distinct Outgroup (cladistics), outgroups or sister taxon, sister taxa to all living jawed vertebrates, which originated among their ranks. In contrast, one 2016 analysis concluded that placodermi are likely monophyletic, though these analyses have been further dismissed with more transitional taxa between placoderms and modern gnathosthomes, solidifying their paraphyletic status. Plac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coccosteidae
Coccosteidae is a family of arthrodire placoderms from the Early to Late Devonian. Fossils appear in various strata in Europe, North America and China. Phylogeny Coccosteidae belongs to the larger clade Coccosteomorphi, which together with its sister clade Pachyosteomorphi forms the group Eubrachythoraci. The phylogeny of Coccosteidae can be shown in the cladogram below: Genera '' Belgiosteus'' A genus of very large coccosteids. Species are found in Middle Devonian Belgium and China. '' Clarkosteus'' ''Coccosteus'' The type genus of the family. Numerous species are found in Middle to Upper Devonian strata throughout Europe and parts of North America. ''Dickosteus'' ''Jiuchengia'' The earliest known coccosteid from Late Emsian Yunnan province, China. It is distinguished from other coccosteids by having an elongated occipital. '' Livosteus'' A genus of very large coccosteids known from Middle to Late Devonian strata of Eastern Europe. ''Millerosteus'' A genus of very smal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
