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Regisaurus Jacobi
''Regisaurus'' ("Rex's lizard", named after its discoverer Francis Rex Parrington) is an extinct genus of small carnivorous therocephalian. It is known from a single described species, the type species ''Regisaurus jacobi'', from the Early Triassic Lystrosaurus Assemblage Zone of South Africa, although at least one undescribed species is also known. Description It was a rather derived baurioid, with a robust skull, short tail, long limbs and relatively large canines. It was apparently related to ''Urumchia'' and like ''Urumchia'', it had vomer bones, which form the secondary palate, but they do not narrow to a tip like in ''Urumchia''. However, it retained some primitive characteristics. It had six incisor teeth in each side of the jaw, whereas other baurioids had less. It was probably carnivorous, and ate insects and small vertebrates Discovery and species ''Regisaurus'' was discovered in 1964 by Francis Rex Parrington and it was named in 1972 by C. H. Mendrez. Two species ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal
Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motility, able to move, can Sexual reproduction, reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of Cell (biology), cells, the blastula, during Embryogenesis, embryonic development. Over 1.5 million Extant taxon, living animal species have been Species description, described—of which around 1 million are Insecta, insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have Ecology, complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a Symmetry in biology#Bilate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urumchia
''Urumchia'' is an extinct genus of therocephalian therapsids from the Early Triassic of China. The type species ''Urumchia lii'' was described by Chinese paleontologist C. C. Young (Yang Zhongjian) in 1952 from the Jiucaiyuan Formation in Xinjiang. The holotype skull has been lost, but Young was able to describe the species on the basis of a detailed cast of the skull. ''Urumchia'' is similar to the South African therocephalian ''Regisaurus'' in having an expanded pair of vomer bones on the underside of the skull that form a secondary palate. In ''Urumchia'' the front end of the vomers narrow to a point, while in ''Regisaurus'' they do not. ''Urumchia'' has six incisors on either side of the upper jaw, a primitive condition among baurioid Baurioidea is a superfamily of therocephalian therapsids. It includes advanced therocephalians such as ''Regisaurus'' and ''Bauria''. The superfamily was named by South African paleontologist Robert Broom in 1911. Bauriamorpha, named by D. M. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lycideopidae
Lycideopidae is an extinct family of therocephalians from the Late Permian and Early Triassic The Early Triassic is the first of three epochs of the Triassic Period of the geologic timescale. It spans the time between Ma and Ma (million years ago). Rocks from this epoch are collectively known as the Lower Triassic Series, which is a un ... of South Africa. Phylogeny Below is a cladogram from Sigurdsen ''et al.'' (2012): References Baurioids Lopingian first appearances Early Triassic extinctions Prehistoric therapsid families {{paleo-therapsid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karenites Ornamentatus
''Karenites'' is an extinct genus of therocephalian therapsids from the Late Permian of Russia. The only species is ''Karenites ornamentatus'', named in 1995. Several fossil specimens are known from the town of Kotelnich in Kirov Oblast. Description ''Karenites'' is known from a partial holotype skeleton, two partial skulls, and isolated jaw bones. Although incomplete, the skulls preserve small and delicate structures like nasal turbinates on the inside of the skull and the stapes bone of the ear. The skull of ''Karenites'' is about long, with the snout much longer than the temporal region of the skull behind the eye sockets. Viewed from above, the skull is triangular. The snout is broad, and the skull widens toward the occiput or posterior margin. Two large holes behind the eye socket called temporal fenestrae occupy most of the posterior skull. Between these fenestra is a narrow sagittal crest. In front of this crest, the skull roof bones are weakly pitted with small ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karenitidae
''Karenites'' is an extinct genus of therocephalian therapsids from the Late Permian of Russia. The only species is ''Karenites ornamentatus'', named in 1995. Several fossil specimens are known from the town of Kotelnich in Kirov Oblast. Description ''Karenites'' is known from a partial holotype skeleton, two partial skulls, and isolated jaw bones. Although incomplete, the skulls preserve small and delicate structures like nasal turbinates on the inside of the skull and the stapes bone of the ear. The skull of ''Karenites'' is about long, with the snout much longer than the temporal region of the skull behind the eye sockets. Viewed from above, the skull is triangular. The snout is broad, and the skull widens toward the occiput or posterior margin. Two large holes behind the eye socket called temporal fenestrae occupy most of the posterior skull. Between these fenestra is a narrow sagittal crest. In front of this crest, the skull roof bones are weakly pitted with small ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urumchia Lii
''Urumchia'' is an extinct genus of therocephalian therapsids from the Early Triassic of China. The type species ''Urumchia lii'' was described by Chinese paleontologist C. C. Young (Yang Zhongjian) in 1952 from the Jiucaiyuan Formation in Xinjiang. The holotype skull has been lost, but Young was able to describe the species on the basis of a detailed cast of the skull. ''Urumchia'' is similar to the South African therocephalian ''Regisaurus'' in having an expanded pair of vomer The vomer (; lat, vomer, lit=ploughshare) is one of the unpaired facial bones of the skull. It is located in the midsagittal line, and articulates with the sphenoid, the ethmoid, the left and right palatine bones, and the left and right maxill ... bones on the underside of the skull that form a secondary palate. In ''Urumchia'' the front end of the vomers narrow to a point, while in ''Regisaurus'' they do not. ''Urumchia'' has six incisors on either side of the upper jaw, a primitive conditi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Regisaurus Jacobi
''Regisaurus'' ("Rex's lizard", named after its discoverer Francis Rex Parrington) is an extinct genus of small carnivorous therocephalian. It is known from a single described species, the type species ''Regisaurus jacobi'', from the Early Triassic Lystrosaurus Assemblage Zone of South Africa, although at least one undescribed species is also known. Description It was a rather derived baurioid, with a robust skull, short tail, long limbs and relatively large canines. It was apparently related to ''Urumchia'' and like ''Urumchia'', it had vomer bones, which form the secondary palate, but they do not narrow to a tip like in ''Urumchia''. However, it retained some primitive characteristics. It had six incisor teeth in each side of the jaw, whereas other baurioids had less. It was probably carnivorous, and ate insects and small vertebrates Discovery and species ''Regisaurus'' was discovered in 1964 by Francis Rex Parrington and it was named in 1972 by C. H. Mendrez. Two species ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ictidosuchoides Longiceps
''Ictidosuchoides'' is an extinct genus of ictidosuchid therocephalians. Fossils have been found from the Karoo Basin in South Africa. The genus is known to have been one of the few therocephalians to have survived the Permian-Triassic extinction event in this area, although its numbers were quite low after the extinction.Ward, P. D., Botha, J., Buick, R., De Kock, M. O., Erwin, D. H., Garrison, G., Kirschvink, J. L., and Smith, R. (2005). Abrupt and gradual extinction among Late Permian land vertebrates in the Karoo Basin, South Africa. ''Science'' 307:709–714. See also * List of therapsids This list of therapsids is an attempt to create a comprehensive listing of all genera that have ever been included in the Therapsida excluding mammals and purely vernacular terms. The list includes all commonly accepted genera, but also genera tha ... * '' Ictidosuchops'' References External links The main groups of non-mammalian synapsids at Mikko's Phylogeny Archive Icti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ictidosuchus Primaevus
''Ictidosuchus'' is an extinct genus of therocephalian therapsid Therapsida is a major group of eupelycosaurian synapsids that includes mammals, their ancestors and relatives. Many of the traits today seen as unique to mammals had their origin within early therapsids, including limbs that were oriented more ...s. References The main groups of non-mammalian synapsids at Mikko's Phylogeny Archive Ictidosuchids Therocephalia genera Fossil taxa described in 1910 Taxa named by Robert Broom {{paleo-therapsid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ictidosuchidae
Ictidosuchidae is an extinct family of therocephalian therapsid Therapsida is a major group of eupelycosaurian synapsids that includes mammals, their ancestors and relatives. Many of the traits today seen as unique to mammals had their origin within early therapsids, including limbs that were oriented more ...s. References Baurioids Animals described in 1903 {{paleo-Therapsid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ictidosuchops Rubidgei
''Ictidosuchops'' is a genus of therocephalian therapsid Therapsida is a major group of eupelycosaurian synapsids that includes mammals, their ancestors and relatives. Many of the traits today seen as unique to mammals had their origin within early therapsids, including limbs that were oriented more ...s. References The main groups of non-mammalian synapsids at Mikko's Phylogeny Archive Baurioids Therocephalia genera Permian synapsids of Africa Fossil taxa described in 1938 Taxa named by Robert Broom {{paleo-therapsid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cladogram
A cladogram (from Greek ''clados'' "branch" and ''gramma'' "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an evolutionary tree because it does not show how ancestors are related to descendants, nor does it show how much they have changed, so many differing evolutionary trees can be consistent with the same cladogram. A cladogram uses lines that branch off in different directions ending at a clade, a group of organisms with a last common ancestor. There are many shapes of cladograms but they all have lines that branch off from other lines. The lines can be traced back to where they branch off. These branching off points represent a hypothetical ancestor (not an actual entity) which can be inferred to exhibit the traits shared among the terminal taxa above it. This hypothetical ancestor might then provide clues about the order of evolution of various features, adaptation, and other evolutionary narratives about ance ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
