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Saudi Gazelle
The Saudi gazelle (''Gazella saudiya'') is a ''Gazella'' species that was once native to the Arabian Peninsula. It was declared extinct in the wild in 1996, as it was last observed in the wild in 1970. The Saudi gazelle was officially declared extinct on the IUCN Red List in 2008. Taxonomy ''Gazella gazella saudiya'' was the scientific name proposed by Douglas Carruthers and Ernst Schwarz in 1939. They described the skull and head skin of a male gazelle specimen collected at an elevation of near Dhlam in Saudi Arabia. Terence Morrison-Scott recognised it as a distinct species ''Gazella saudiya'' in 1939. Colin Groves examined horn shapes and sizes of zoological specimens of gazelles and recognised the Saudi gazelle as a subspecies of the Dorcas gazelle ''Gazella dorcas saudiya'' in 1969. Phylogenetic analysis of museum samples of the Saudi gazelle revealed that it is distinct from and a sister taxon of the Dorcas gazelle. Distribution and habitat The Saudi gazelle once lived i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Douglas Carruthers
Alexander Douglas Mitchell Carruthers (4 October 1882 – 23 May 1962) was an explorer and naturalist of some repute. He was the son of the Reverend William Mitchell Carruthers of Holbrook, Suffolk, Holbrook, and was an explorer in the Middle East in the early 1900s. Biography Carruthers was born in London and was educated at Haileybury College and Trinity College, Cambridge. He worked as secretary to a number of people active at the Royal Geographical Society, and underwent training in land survey work, also becoming an expert taxidermist. Carruthers took part in the British Museum expedition to Rwenzori Mountains in the Congo Free State, Congo, 1905–1906 and sent home specimens of birds and mammals. In 1910 he joined John H. Miller and Morgan Philips Price in an expedition through the desert of Outer Mongolia, publishing two volumes on ''Unknown Mongolia'' in 1913. In 1915, Carruthers married Mary Morrison Hill Trevor in St. George's, Hanover Square, London. She died in 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sister Taxon
In phylogenetics, a sister group or sister taxon, also called an adelphotaxon, comprises the closest relative(s) of another given unit in an evolutionary tree. Definition The expression is most easily illustrated by a cladogram: Taxon A and taxon B are sister groups to each other. Taxa A and B, together with any other extant or extinct descendants of their most recent common ancestor (MRCA), form a monophyletic group, the clade AB. Clade AB and taxon C are also sister groups. Taxa A, B, and C, together with all other descendants of their MRCA form the clade ABC. The whole clade ABC is itself a subtree of a larger tree which offers yet more sister group relationships, both among the leaves and among larger, more deeply rooted clades. The tree structure shown connects through its root to the rest of the universal tree of life. In cladistic standards, taxa A, B, and C may represent specimens, species, genera, or any other taxonomic units. If A and B are at the same taxonomi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extinct Mammals Of Asia
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the Endling, last individual of the species, although the Functional extinction, capacity to breed and recover may have been lost before this point. Because a species' potential Range (biology), range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxon, Lazarus taxa, where a species presumed extinct abruptly "reappears" (typically in the Fossil, fossil record) after a period of apparent absence. More than 99% of all species that ever Life, lived on Earth, amounting to over five billion species, are estimated to have died out. It is estimated that there are currently around 8.7 million species of eukaryote globally, and possibly many times more if microorganisms, like bacteria, are included. Notable extinct a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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