Nikkasauridae

	Nikkasauridae Nikkasauridae is a family of biarmosuchian therapsids. It contains two genera Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclat ... '' Nikkasaurus'' and '' Reiszia''.Kemp, Thomas Stainforth (2005). ''The Origin and Evolution of Mammals''. . References Biarmosuchians Prehistoric therapsid families {{paleo-therapsid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Reiszia ''Reiszia'' is an extinct genus of therapsids from European Russia belonging to the family Nikkasauridae. Taxonomy Two species are known, ''Reiszia gubini'' and ''R. tippula'', both found in middle Permian sediments in the Mezen River Basin of European Russia. ''R. gubini'' is known from a partial skull and mandible, while ''R. tippula'' is known only from a mandible.M. F. Ivakhnenko. 2008. Podklass Theromorpha. In M. F. Ivakhnenko and E. N. Kurochkin (eds.), Iskopaemye pozvonotchnye Rossii i sopredel'nykh stran: Iskopaemye reptilii i ptitsy, Tchast' 1 ossil vertebrates of Russia and adjacent countries: Fossil reptiles and birds, Part 1 GEOS, Moscow 101-183 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 ... References * Kemp, Thomas Stainforth (2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Nikkasaurus ''Nikkasaurus'' is an extinct genus of therapsids first named and described by Ivakhnenko. Description ''Nikkasaurus'' was a small therapsid, with a skull about 5 cm long. The eyes had large orbits and sclerotic rings, and the head was tilted back, as with all therapsids. The skull looks superficially similar to those of the pelycosaurs, in particular members of Varanopidae. Biology ''Nikkasaurus'' was probably mainly insectivorous, and possibly nocturnal. Systematics The only known species is the type species ''N. tatarinovi'', described by MF Ivahnenko in 2000, from the Middle Permian Mezen River Basin. ''Nikkasaurus'' is possibly a relic of a more ancient stage of therapsid development.M. F. Ivakhnenko. 2008. Podklass Ophiacomorpha. In M. F. Ivakhnenko and E. N. Kurochkin (eds.), Iskopaemye pozvonotchnye Rossii i sopredel'nykh stran: Iskopaemye reptilii i ptitsy, Tchast' 1 ossil vertebrates of Russia and adjacent countries: Fossil reptiles and birds, Part 1 GEOS, Mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Biarmosuchian Biarmosuchians are an extinct clade of non-mammalian synapsids from the Permian. They are the most basal group of the therapsids. All of them were moderately-sized, lightly-built carnivores, intermediate in form between basal sphenacodont "pelycosaurs" and more advanced therapsids. Biarmosuchians were rare components of Permian ecosystems, and the majority of species belong to the clade Burnetiamorpha, which are characterized by elaborate cranial ornamentation. Characteristics The biarmosuchian skull is very similar to the sphenacodontid skull, differing only in the larger temporal fenestra (although these are still small relative to later therapsids), slightly backward-sloping occiput (the reverse of the pelycosaur condition), reduced number of teeth, and single large canine teeth in both upper and lower jaws, and other features (Carroll 1988 pp. 370, Benton 2000 p. 114). In later specialised Biarmosuchia, these resemble the enlarged canines of the Gorgonopsia. The pre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. '' Panthera leo'' (lion) and '' Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants of an ancestral taxon are grouped together (i.e. phylogenetic analysis should c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]