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Paraspadella Johnstoni
''Paraspadella'' is a genus of chaetognaths in the family Spadellidae. ''Paraspadella'' was originally considered as '' Spadella'' before a revision separated that genus into three genera: ''Spadella'', ''Paraspadella'', and ''Gephyrospadella'', the last of which is now synonymised to ''Paraspadella''. The initial division was based on previous knowledge of three groups of ''Spadella'', in a similar manner in which '' Sagitta'' was divided into a family of genera. ''Paraspadella'' is differentiated from ''Spadella'' by the presence of disparate (digital) adhesive organs, present in the former to various degrees, but entirely absent in the latter. Species *''Paraspadella anops'' Bowman & Bieri, 1989Bowman, T. & Bieri, R. (1989). ''Paraspadella anops'', new species, from Sagittarius Cave, Grand Bahama Island, the second troglobitic chaetognath. ''Proceedings of the Biological Society of Washington'', 102(3), 586–589. *''Paraspadella caecafea'' (von Salvini-Plawen, 1986) *''Paraspa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus comes above species and below family (taxonomy), 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 taxonomy (biology), 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chaetognatha
The Chaetognatha or chaetognaths (meaning ''bristle-jaws'') are a phylum of predatory marine worms that are a major component of plankton worldwide. Commonly known as arrow worms, about 20% of the known Chaetognatha species are benthic, and can attach to algae and rocks. They are found in all marine waters, from surface tropical waters and shallow tide pools to the deep sea and polar regions. Most chaetognaths are transparent and are torpedo shaped, but some deep-sea species are orange. They range in size from . There are more than 120 modern species assigned to over 20 genera. Despite the limited diversity of species, the number of individuals is large. Arrow worms are usually considered a type of protostome that do not belong to either Ecdysozoa or Lophotrochozoa. Anatomy Chaetognaths are transparent or translucent dart-shaped animals covered by a cuticle. The body is divided into a distinct head, trunk, and tail. There are between four and fourteen hooked, grasping spines ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Family (biology)
Family ( la, familia, plural ') is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as the "walnut family". What belongs to a family—or if a described family should be recognized at all—are proposed and determined by practicing taxonomists. There are no hard rules for describing or recognizing a family, but in plants, they can be characterized on the basis of both vegetative and reproductive features of plant species. Taxonomists often take different positions about descriptions, and there may be no broad consensus across the scientific community for some time. The publishing of new data and opini ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spadellidae
Spadellidae is a family of sagittoideans in the order Phragmophora. Spadellidae prey on plankton Plankton are the diverse collection of organisms found in water (or air) that are unable to propel themselves against a current (or wind). The individual organisms constituting plankton are called plankters. In the ocean, they provide a crucia ... and commonly reside in the epipelagic zone of the ocean. Genera *'' Bathyspadella'' Tokioka, 1939Tokioka, T. (1939). Three new chaetognaths from Japanese waters. ''Memoirs of the Imperial Marine Observatory'', 7, 129–139. *'' Calispadella'' Casanova & Moreau, 2005Casanova, J. Moreau, X. (2005). ''Calispadella alata'' n. gen., n. sp., the first chaetognath recorded from a hydrothermal vent site (Mid-Atlantic Ridge). ''Journal of Plankton Research'', 27(2), 221–225. *'' Hemispadella'' Casanova, 1996Casanova, J. (1996). A new genus and species of deep benthic chaetognath from the Atlantic: a probable link between the families Heterok ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spadella
''Spadella'' is a genus of worms belonging to the family Spadellidae. The species of this genus are found in Europe, Northern America, Pacific Ocean. Species Species: *''Spadella angulata'' *''Spadella antarctica'' *''Spadella birostrata ''Spadella'' is a genus of worms belonging to the family Spadellidae. The species of this genus are found in Europe, Northern America, Pacific Ocean. Species Species: *''Spadella angulata'' *''Spadella antarctica ''Spadella'' is a genus of ...'' References {{Taxonbar, from=Q2330212 Chaetognatha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sagitta
Sagitta is a dim but distinctive constellation in the northern sky. Its name is Latin for 'arrow', not to be confused with the significantly larger constellation Sagittarius 'the archer'. It was included among the 48 constellations listed by the 2nd-century astronomer Ptolemy, and it remains one of the 88 modern constellations defined by the International Astronomical Union. Although it dates to antiquity, Sagitta has no star brighter than 3rd magnitude and has the third-smallest area of any constellation. Gamma Sagittae is the constellation's brightest star, with an apparent magnitude of 3.47. It is an aging red giant star 90% as massive as the Sun that has cooled and expanded to a diameter 54 times greater than it. Delta, Epsilon, Zeta, and Theta Sagittae are each multiple stars whose components can be seen in small telescopes. V Sagittae is a cataclysmic variable—a binary star system composed of a white dwarf accreting mass of a donor star that is expected to go nova and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paraspadella Anops
''Paraspadella'' is a genus of chaetognaths in the family Spadellidae Spadellidae is a family of sagittoideans in the order Phragmophora. Spadellidae prey on plankton Plankton are the diverse collection of organisms found in water (or air) that are unable to propel themselves against a current (or wind). Th .... ''Paraspadella'' was originally considered as '' Spadella'' before a revision separated that genus into three genera: ''Spadella'', ''Paraspadella'', and ''Gephyrospadella'', the last of which is now synonymised to ''Paraspadella''. The initial division was based on previous knowledge of three groups of ''Spadella'', in a similar manner in which '' Sagitta'' was divided into a family of genera. ''Paraspadella'' is differentiated from ''Spadella'' by the presence of disparate (digital) adhesive organs, present in the former to various degrees, but entirely absent in the latter. Species *'' Paraspadella anops'' Bowman & Bieri, 1989Bowman, T. & Bieri, R. (1989). '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paraspadella Caecafea
''Paraspadella'' is a genus of chaetognaths in the family Spadellidae. ''Paraspadella'' was originally considered as '' Spadella'' before a revision separated that genus into three genera: ''Spadella'', ''Paraspadella'', and ''Gephyrospadella'', the last of which is now synonymised to ''Paraspadella''. The initial division was based on previous knowledge of three groups of ''Spadella'', in a similar manner in which '' Sagitta'' was divided into a family of genera. ''Paraspadella'' is differentiated from ''Spadella'' by the presence of disparate (digital) adhesive organs, present in the former to various degrees, but entirely absent in the latter. Species *''Paraspadella anops ''Paraspadella'' is a genus of chaetognaths in the family Spadellidae Spadellidae is a family of sagittoideans in the order Phragmophora. Spadellidae prey on plankton Plankton are the diverse collection of organisms found in water (or ...'' Bowman & Bieri, 1989Bowman, T. & Bieri, R. (1989). ''P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paraspadella Gotoi
''Paraspadella'' is a genus of chaetognaths in the family Spadellidae. ''Paraspadella'' was originally considered as '' Spadella'' before a revision separated that genus into three genera: ''Spadella'', ''Paraspadella'', and ''Gephyrospadella'', the last of which is now synonymised to ''Paraspadella''. The initial division was based on previous knowledge of three groups of ''Spadella'', in a similar manner in which '' Sagitta'' was divided into a family of genera. ''Paraspadella'' is differentiated from ''Spadella'' by the presence of disparate (digital) adhesive organs, present in the former to various degrees, but entirely absent in the latter. Species *''Paraspadella anops'' Bowman & Bieri, 1989Bowman, T. & Bieri, R. (1989). ''Paraspadella anops'', new species, from Sagittarius Cave, Grand Bahama Island, the second troglobitic chaetognath. ''Proceedings of the Biological Society of Washington'', 102(3), 586–589. *''Paraspadella caecafea ''Paraspadella'' is a genus of chaet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paraspadella Johnstoni
''Paraspadella'' is a genus of chaetognaths in the family Spadellidae. ''Paraspadella'' was originally considered as '' Spadella'' before a revision separated that genus into three genera: ''Spadella'', ''Paraspadella'', and ''Gephyrospadella'', the last of which is now synonymised to ''Paraspadella''. The initial division was based on previous knowledge of three groups of ''Spadella'', in a similar manner in which '' Sagitta'' was divided into a family of genera. ''Paraspadella'' is differentiated from ''Spadella'' by the presence of disparate (digital) adhesive organs, present in the former to various degrees, but entirely absent in the latter. Species *''Paraspadella anops'' Bowman & Bieri, 1989Bowman, T. & Bieri, R. (1989). ''Paraspadella anops'', new species, from Sagittarius Cave, Grand Bahama Island, the second troglobitic chaetognath. ''Proceedings of the Biological Society of Washington'', 102(3), 586–589. *''Paraspadella caecafea'' (von Salvini-Plawen, 1986) *''Paraspa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paraspadella Legazpichessi
''Paraspadella'' is a genus of chaetognaths in the family Spadellidae. ''Paraspadella'' was originally considered as '' Spadella'' before a revision separated that genus into three genera: ''Spadella'', ''Paraspadella'', and ''Gephyrospadella'', the last of which is now synonymised to ''Paraspadella''. The initial division was based on previous knowledge of three groups of ''Spadella'', in a similar manner in which '' Sagitta'' was divided into a family of genera. ''Paraspadella'' is differentiated from ''Spadella'' by the presence of disparate (digital) adhesive organs, present in the former to various degrees, but entirely absent in the latter. Species *''Paraspadella anops'' Bowman & Bieri, 1989Bowman, T. & Bieri, R. (1989). ''Paraspadella anops'', new species, from Sagittarius Cave, Grand Bahama Island, the second troglobitic chaetognath. ''Proceedings of the Biological Society of Washington'', 102(3), 586–589. *''Paraspadella caecafea'' (von Salvini-Plawen, 1986) *''Paraspa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paraspadella Nana
''Paraspadella'' is a genus of chaetognaths in the family Spadellidae. ''Paraspadella'' was originally considered as '' Spadella'' before a revision separated that genus into three genera: ''Spadella'', ''Paraspadella'', and ''Gephyrospadella'', the last of which is now synonymised to ''Paraspadella''. The initial division was based on previous knowledge of three groups of ''Spadella'', in a similar manner in which '' Sagitta'' was divided into a family of genera. ''Paraspadella'' is differentiated from ''Spadella'' by the presence of disparate (digital) adhesive organs, present in the former to various degrees, but entirely absent in the latter. Species *''Paraspadella anops'' Bowman & Bieri, 1989Bowman, T. & Bieri, R. (1989). ''Paraspadella anops'', new species, from Sagittarius Cave, Grand Bahama Island, the second troglobitic chaetognath. ''Proceedings of the Biological Society of Washington'', 102(3), 586–589. *''Paraspadella caecafea'' (von Salvini-Plawen, 1986) *''Paraspa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
