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Oplophoroidea
The family Oplophoridae is a taxon of pelagic shrimp and the only subtaxon of the superfamily Oplophoroidea. It contains the following genera: *'' Acanthephyra'' A. Milne-Edwards, 1881 *'' Ephyrina'' Smith, 1885 *'' Heterogenys'' Chace, 1986 *'' Hymenodora'' Sars, 1877 *'' Janicella'' Chace, 1986 *'' Kemphyra'' Chace, 1986 *'' Meningodora'' Smith, 1882 *'' Notostomus'' A. Milne-Edwards, 1881 *† '' Odontochelion'' Garassino, 1994 *'' Oplophorus'' H. Milne-Edwards, 1837 *'' Systellaspis'' Bate, 1888 *† '' Tonellocaris'' Garassino, 1998 Molecular phylogenetics suggests that the family as currently circumscribed In geometry, the circumscribed circle or circumcircle of a polygon is a circle that passes through all the vertices of the polygon. The center of this circle is called the circumcenter and its radius is called the circumradius. Not every polyg ... is polyphyletic, and may lead to the resurrection of a family Acanthephyridae for all genera except ''Oplophorus'', ''Sy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caridea
The Caridea, commonly known as caridean shrimp or true shrimp, are an infraorder of shrimp within the order Decapoda. This infraorder contains all species of true shrimp. They are found widely around the world in both fresh and salt water. Many other animals with similar names – such as the mud shrimp of Axiidea and the boxer shrimp of Stenopodidea – are not true shrimp, but many have evolved features similar to true shrimp. Biology Carideans are found in every kind of aquatic habitat, with the majority of species being marine. Around a quarter of the described species are found in fresh water, however, including almost all the members of the species-rich family Atyidae and the Palaemonidae subfamily Palaemoninae. They include several commercially important species, such as ''Macrobrachium rosenbergii'', and are found on every continent except Antarctica. The marine species are found at depths to , and from the tropics to the polar regions. In addition to the great variety in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acanthephyra
''Acanthephyra'' is a genus of shrimp in the family Acanthephyridae, with species that live at depths from 0 to more than 5000 meters deep below the ocean surface. Species * '' Acanthephyra acanthitelsonis'' Spence Bate, 1888 * '' Acanthephyra acutifrons'' Spence Bate, 1888 * '' Acanthephyra armata'' A. Milne-Edwards, 1881 * '' Acanthephyra brevicarinata'' Hanamura, 1984 * '' Acanthephyra brevirostris'' Smith, 1885 * '' Acanthephyra carinata'' Spence Bate, 1888 * '' Acanthephyra chacei'' Krygier & Forss, 1981 * '' Acanthephyra cucullata'' Faxon, 1893 * '' Acanthephyra curtirostris'' Wood-Mason & Alcock, 1891 * '' Acanthephyra eximia'' Smith, 1884 * '' Acanthephyra faxoni'' Calman, 1939 * '' Acanthephyra fimbriata'' Alcock & Anderson, 1894 * '' Acanthephyra indica'' Balss, 1925 * '' Acanthephyra kingsleyi'' Spence Bate, 1888 * '' Acanthephyra media'' Spence Bate, 1888 * '' Acanthephyra pelagica'' Risso, 1816 * '' Acanthephyra prionota'' Foxton, 1971 * '' Acanthephyra purpurea'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hymenodora Glacialis
''Hymenodora glacialis'' is a species of pelagic shrimp Shrimp are crustaceans (a form of shellfish) with elongated bodies and a primarily swimming mode of locomotion – most commonly Caridea and Dendrobranchiata of the decapod order, although some crustaceans outside of this order are refer ... in the Acanthephyridae family. It is the only known species of pelagic shrimp to inhabit the Canada Basin. References Caridea Crustaceans described in 1874 {{Caridea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyphyly
A polyphyletic group is an assemblage of organisms or other evolving elements that is of mixed evolutionary origin. The term is often applied to groups that share similar features known as homoplasies, which are explained as a result of convergent evolution. The arrangement of the members of a polyphyletic group is called a polyphyly .. ource for pronunciation./ref> It is contrasted with monophyly and paraphyly. For example, the biological characteristic of warm-bloodedness evolved separately in the ancestors of mammals and the ancestors of birds; "warm-blooded animals" is therefore a polyphyletic grouping. Other examples of polyphyletic groups are algae, C4 photosynthetic plants, and edentates. Many taxonomists aim to avoid homoplasies in grouping taxa together, with a goal to identify and eliminate groups that are found to be polyphyletic. This is often the stimulus for major revisions of the classification schemes. Researchers concerned more with ecology than with system ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Circumscription (taxonomy)
In biological taxonomy, circumscription is the content of a taxon, that is, the delimitation of which subordinate taxa are parts of that taxon. If we determine that species X, Y, and Z belong in Genus A, and species T, U, V, and W belong in Genus B, those are our circumscriptions of those two genera. Another systematist might determine that T, U, V, W, X, Y, and Z all belong in genus A. Agreement on circumscriptions is not governed by the Codes of Zoological or Botanical Nomenclature, and must be reached by scientific consensus. A goal of biological taxonomy is to achieve a stable circumscription for every taxon. This goal conflicts, at times, with the goal of achieving a natural classification that reflects the evolutionary history of divergence of groups of organisms. Balancing these two goals is a work in progress, and the circumscriptions of many taxa that had been regarded as stable for decades are in upheaval in the light of rapid developments in molecular phylogenetics ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Molecular Phylogenetics
Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to determine the processes by which diversity among species has been achieved. The result of a molecular phylogenetic analysis is expressed in a phylogenetic tree. Molecular phylogenetics is one aspect of molecular systematics, a broader term that also includes the use of molecular data in taxonomy and biogeography. Molecular phylogenetics and molecular evolution correlate. Molecular evolution is the process of selective changes (mutations) at a molecular level (genes, proteins, etc.) throughout various branches in the tree of life (evolution). Molecular phylogenetics makes inferences of the evolutionary relationships that arise due to molecular evolution and results in the construction of a phylogenetic tree. History The theoretical frame ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
