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Parasagitta Peruviana
''Parasagitta'' is a genus of arrow worms (phylum Chaetognatha) in the family Sagittidae. At one time these arrow worms were classified in the genus '' Sagitta''. Species The World Register of Marine Species includes the following species in the genus: *''Parasagitta chilensis'' (Villenas & Palma, 2006) *'' Parasagitta elegans'' (Verrill, 1873) *''Parasagitta euneritica'' (Alvariño, 1961) *''Parasagitta friderici'' (Ritter-Záhony, 1911) *''Parasagitta megalophthalma ''Parasagitta'' is a genus of arrow worms (phylum Chaetognatha) in the family Sagittidae. At one time these arrow worms were classified in the genus '' Sagitta''. Species The World Register of Marine Species includes the following species i ...'' (Dallot & Ducret, 1969) *'' Parasagitta peruviana'' (Sund, 1961) *'' Parasagitta popovicii'' (Sund, 1961) *'' Parasagitta setosa'' (Müller, 1847) *'' Parasagitta tenuis'' (Conant, 1896) References Chaetognatha Protostome genera {{Chaetognatha-stu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parasagitta Elegans
''Parasagitta elegans'' is a small arrow worm in the family Sagittidae, previously named ''Sagitta elegans'' Morphology ''Parasagitta elegans'' (prev. ''Sagitta elegans''). Body of adult animal can grow up to 45 mm, is narrow, firm and opaque (this image: animal very see-through. Visible opaque animal needs better picture). Fins are separated, rounded, and completely rayed. Anterior fins beginning below the ventral ganglion. Alimentary diverticula present. Eyes with small, round pigment spot. Ovaries long and narrow. Seminal vesicles conical in shape, either exactly next to or very close to the tail fin, separated from posterior fins. For anatomy, reproduction, classification, and fossil record; see Chaetognatha Taxonomy Three subspecies are recognised - ''Sagitta elegans arctica'', ''Sagitta elegans baltica'' and ''Sagitta elegans elegans''. The subspecies are considered to vary in size depending on the temperature of the waters in which they develop, which could be an indi ... [...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] |
Sagittidae
Sagittidae is a family of sagittoideans in the order Aphragmophora. Genera *'' Aidanosagitta'' Tokioka & Pathansali, 1963Tokioka, T. & Pathansali, D. (1963). Another new chaetognath from Malay waters, with a proposal of grouping some species of ''Sagitta'' into subgenera. ''Publications of the Seto Marine Biological Laboratory'', 11(1), 119–123. *'' Caecosagitta'' Tokioka, 1965Tokioka, T. (1965). The taxonomical outline of Chaetognatha. ''Publications of the Seto Marine Biological Laboratory'', 12(5), 335–357. *'' Decipisagitta'' Bieri, 1991Bieri, R. (1991). Systematics of the Chaetognatha. In Bone, Q., Kapp, H. & Pierrot-Bults, A. (Eds.), ''The Biology of Chaetognaths''. Oxford: Oxford University. *'' Ferosagitta'' Kassatkina, 1971Kassatkina, A. P. (1971). New neritic species of chaetognaths from Poseta Bay, Sea of Japan. ''Investigations of Marine Fauna, Fauna and Flora of Poseta Bay, Sea of Japan'', 8(16), 265–294. *'' Flaccisagitta'' Tokioka, 1965 *'' Mesosagitta'' Toki ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sagitta (arrowworm)
''Sagitta'' is a genus of 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 ..., a phylum commonly known as arrowworms or arrow worms. Phylum Chaetognatha comprises small marine worms. This genus is characterized in part by the distribution of the cilia on the body, the thick rays in the fins, and hooks which are not serrated.Kassatkina, A. P. (2007)Review of the genera of the family Sagittidae with separation of a new subfamily and description of a new species of the genus ''Sagitta'' from the Sea of Japan (Chaetognatha).''Zoosystematica Rossica'', 16(2), 157-162. As of 2007 there are 15 species. More have since been described.Kassatkina, A. P. (2008)New species of the genus ''Sagitta sensu str''.(Chaetognatha) from the Sea of Japan with description of an original stain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World Register Of Marine Species
The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms. Content The content of the registry is edited and maintained by scientific specialists on each group of organism. These taxonomists control the quality of the information, which is gathered from the primary scientific literature as well as from some external regional and taxon-specific databases. WoRMS maintains valid names of all marine organisms, but also provides information on synonyms and invalid names. It is an ongoing task to maintain the registry, since new species are constantly being discovered and described by scientists; in addition, the nomenclature and taxonomy of existing species is often corrected or changed as new research is constantly being published. Subsets of WoRMS content are made available, and can have separate badging and their own home/launch pages, as "subregisters", such as the ''World List of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
