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Xenokrohnia
''Xenokrohnia'' is a genus of chaetognaths in the family Heterokrohniidae. It consists of one species, ''Xenokrohnia sorbei'' Casanova, 1993, which lives in a marine environment. The initial discovery was made from six specimens found in a deep-sea search in the Bay of Biscay for ''Spadella equidentata'' Casanova, 1987. A uniquely large (ventral) secretory gland, separate from other chaetognaths, defined the new genus and species. The gland, which is likely used to rid the body of digestive fluids, is probably due to the unique feeding habits of the species; these may include scavenging habits. The presence of an unusual and seemingly superfluous digestive utility is similar to ''Archeterokrohnia ''Archeterokrohnia'' is a genus of chaetognaths in the family Heterokrohniidae Heterokrohniidae is a family of sagittoideans in the order Phragmophora Phragmophora is an order of sagittoideans in the phylum Chaetognatha. Families * Eukr ... palpifera'' Casanova, 1986,Casanov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heterokrohniidae
Heterokrohniidae is a family of sagittoideans in the order Phragmophora. Genera *''Archeterokrohnia'' Casanova, 1986 *''Heterokrohnia'' von Ritter-Záhony, 1911von Ritter-Záhony, R. (1911). Revision der Chatognathen. ''Deutsche Südpolar Expedition, 1901–1903'', 13, 1–71. *''Xenokrohnia ''Xenokrohnia'' is a genus of chaetognaths in the family Heterokrohniidae. It consists of one species, ''Xenokrohnia sorbei'' Casanova, 1993, which lives in a marine environment. The initial discovery was made from six specimens found in a deep- ...'' Casanova, 1993Casanova, J. (1992). A new genus and species of deep-sea chaetognath from the Bay of Biscal with a strange ventral secretory gland. ''Journal of Natural History'', 27(2), 445–455. References Chaetognatha Protostome families {{Chaetognatha-stub ... [...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] |
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] |
Archeterokrohnia
''Archeterokrohnia'' is a genus of chaetognaths in the family Heterokrohniidae.The total body length excluding tail fin 28.5; the tail section is 55.2% of the tail fin; head blunt when hooded, triangular after preservation, head with 3.5 mm. Furthermore, the eyes are absent, the trunk section is orange throughout in life, and the organism exists around 3200 m below sea level.Thuesen, Erik V., and Steven H.d. Haddock. “Archeterokrohnia Docrickettsae (Chaetognatha: Phragmophora: Heterokrohniidae), a New Species of Deep-Sea Arrow Worm from the Gulf of California.” Zootaxa, 2013 Magnolia Press, www.mapress.com/j/zt/article/view/zootaxa.3717.3.2/32220. Species *''Archeterokrohnia docrickettsae ''Archeterokrohnia docrickettsae'' is a type of deep-sea marine arrow worm. It is the largest species in the ''Archeterokrohnia ''Archeterokrohnia'' is a genus of chaetognaths in the family Heterokrohniidae Heterokrohniidae is a family of ...'' Thuesen & Haddock, 2013Thuesen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pedipalps
Pedipalps (commonly shortened to palps or palpi) are the second pair of appendages of chelicerates – a group of arthropods including spiders, scorpions, horseshoe crabs, and sea spiders. The pedipalps are lateral to the chelicerae ("jaws") and anterior to the first pair of walking legs. Overview Pedipalps are composed of six segments or articles: the coxa, the trochanter, the femur, the short patella, the tibia, and the tarsus. In spiders, the coxae frequently have extensions called maxillae or gnathobases, which function as mouth parts with or without some contribution from the coxae of the anterior legs. The limbs themselves may be simple tactile organs outwardly resembling the legs, as in spiders, or chelate weapons ( pincers) of great size, as in scorpions. The pedipalps of Solifugae are covered in setae, but have not been studied in detail. Comparative studies of pedipalpal morphology may suggest that leg-like pedipalps are primitive in arachnids. At present, the only ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
