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Seguenziidae
Seguenziidae is a family of very small deepwater sea snails, marine gastropod mollusks in the superfamily Seguenzioidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).Bouchet, P. (2012). Seguenziidae. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=23116 on 2013-03-26 Distribution Species from this family occur in the Atlantic Ocean, the Pacific Ocean, the Indian Ocean and the Antarctic Ocean, mostly at bathyal and abyssal depths. Only a few species have been found at depths less than 300 m and none at intertidal depths. Description The thin, translucent, white shell has a trochiform shape. They are small or very small. Their maximum height is 22 mm. They are usually nacreous. The inner lip has often a tooth-like fold. The outer lip has characteristically one to three concave notches (except in the genus '' Guttula''). The chitinous operculum is multispiral. The rhipidoglossan radula ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seguenzioidea
Seguenzioidea is a superfamily of minute to medium-sized sea snails, marine gastropod mollusks in the clade Vetigastropoda.Gofas, S. (2010). Seguenzioidea. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=224565 on 2011-01-09 Description The distinctive characteristics of the shells of the Seguenzioidea are: * the nacreous layer (a plesiomorphic character, i.e. a character state that a taxon is inferred to have been retained from its ancestors) This occurs also in the following families: Pleurotomariidae, Haliotidae, Turbinidae, Trochidae, and possibly in the Skeneidae. * the protoconch has a trochoid shape. * usually with one or more labral sinuses. This character is also found is several other superfamilies such as Neomphaloidea, Pleurotomarioidea, Fissurelloidea, and Scissurelloidea and in the families Siliquariidae and Turridae. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eratasthelys
''Eratasthelys'' is a genus of extremely small deep water sea snails, marine gastropod mollusks in the family Seguenziidae.WoRMS (2012). ''Eratasthelys'' Marshall, 1991. Retrieved through: 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 specialist ... at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492298 on 2013-04-14 Species Species within the genus ''Eratasthelys'' include: *'' Eratasthelys corona'' Marshall, 1991 References External links World Register of Marine Species Seguenziidae Monotypic gastropod genera {{Seguenziidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asthelys
''Asthelys'' is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae. Description The conical shell lacks axial riblets and a peripheral carina but has a punctate microsculpture. The midwhorl angulation is initially absent, but present on later whorls. The shell contains no spiral lirae. The U-shaped posterior sinus is shallow. The basal sinus is present, but there is no anterolateral sinus. The columella has no sinus or tooth. Tha aperture has a rhomboidal shape. There is no umbilical septum. Radula: the rachidian tooth is broader than high and has lateral wings prominent. The lateral tooth cusp is broad. There are less than 10 marginal tooth pairs. Species Species within the genus ''Asthelys'' include: * '' Asthelys antarctica'' Marshall, 1988 * '' Asthelys careyi'' Geiger, 2017 * '' Asthelys depressa'' Marshall, 1991 * '' Asthelys hyeresensis'' Hoffman, Gofas & Freiwald, 2020 * '' Asthelys munda'' (Watson, 1879) * '' Asthelys nitidula'' Marshall, 1991 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anxietas
''Anxietas'' is a genus of extremely small deep water sea snails, marine gastropod mollusks in the family Seguenziidae.Rosenberg, G. (2012). ''Anxietas''. Retrieved through: 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 specialist ... at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492296 on 2013-04-14Marshall B.A. (1991). Mollusca Gastropoda : Seguenziidae from New Caledonia and the Loyalty Islands. In A. Crosnier & P. Bouchet (Eds) Résultats des campagnes Musorstom, vol. 7. Mémoires du Muséum National d'Histoire Naturelle, A, 150:41-109. Species Species within the genus ''Anxietas'' include: *'' Anxietas exigua'' Marshall, 1991 *'' Anxietas inspirata'' Marshall, 1991 *'' Anxietas perplexa'' Iredale, 1917 References External links ITISWorl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oligomeria
''Oligomeria'' is a genus of extremely small deep water sea snails, marine gastropod mollusks in the family Seguenziidae.Bouchet, P. (2012). ''Oligomeria''. Retrieved through: 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 specialist ... at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492465 on 2013-04-14 Species Species within the genus ''Oligomeria'' include: *'' Oligomeria conoidea'' Galkin & Golikov, 1985 References External links ITISWorld Register of Marine Species Seguenziidae Monotypic gastropod genera {{Seguenziidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Davisiana
''Davisiana'' is a genus of extremely small deep water sea snails, marine gastropod mollusks in the family Seguenziidae.WoRMS (2012). ''Davisiana'' Egorova, 1972. Retrieved through: 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 specialist ... at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492464 on 2013-04-14 Species Species within the genus ''Davisiana'' include: *'' Davisiana inquirenda'' Egorova, 1972 References External links World Register of Marine Species Seguenziidae Monotypic gastropod genera {{Seguenziidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guttula
''Guttula'' is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae. Description (Original description by Schepman) The small, shell has a conoidal shape. It is smooth, pearly, and perforate. The aperture is rounded, with an angle at the base. The operculum contains few whorls. It is chiefly on account of the peculiar radula, that Schepman had located the then only species in a new genus. Quin (1998) adds the following specifications. Shell: The shell has no peripheral carina, no axial riblets, no midwhorl angulation, no spiral lirae, no basal, posterior or anterolateral sinus, no columellar sinus. The aperture has a circular shape. The columellar tooth is absent. There is no umbilical septum. The shell has punctate microsculpture. Radula The radula (, ; plural radulae or radulas) is an anatomical structure used by molluscs for feeding, sometimes compared to a tongue. It is a minutely toothed, chitinous ribbon, which is typically used for scraping ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thelyssina
''Thelyssina'' is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae. Description The conical shell contains a peripheral carina but no axial riblets, spiral lirae or microsculpture. The U-shaped posterior sinus is shallow. The anterolateral sinus is a channel. The basal sinus is present. The columella has no sinus or tooth. The aperture has a rhomboidal shape. There are no data about the radula The radula (, ; plural radulae or radulas) is an anatomical structure used by molluscs for feeding, sometimes compared to a tongue. It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food .... Species Species within the genus ''Thelyssina'' include: *'' Thelyssina sterrha'' Marshall, 1983 References {{Taxonbar, from=Q7781158 Seguenziidae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seguenzia Monocingulata
''Seguenzia monocingulata'' is an extinct species of sea snail, a marine gastropod mollusk in the family Seguenziidae. It resembles '' Seguenzia formosa'' and has been regarded as a synonym of that (extant) species. However the two species are distinct, based on shell morphology. Description The height of the shell attains 4 mm. The white, imperforate shell has a high conoid shape. The whorls have revolving ribs, of which the last has about four distant prominent ones, besides minor striae on the base. Distribution This species was originally described by Seguenza from Pliocene fossils found at Torrente Trapani Trapani ( , ; scn, Tràpani ; lat, Drepanum; grc, Δρέπανον) is a city and municipality (''comune'') on the west coast of Sicily, in Italy. It is the capital of the Province of Trapani. Founded by Elymians, the city is still an impor ..., a locality of the city of Messina, Sicily. It is common in deep-sea deposits from southern Italy. References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taxonomy Of The Gastropoda (Bouchet & Rocroi, 2005)
The taxonomy of the Gastropoda as it was revised in 2005 by Philippe Bouchet and Jean-Pierre Rocroi is a system for the scientific classification of gastropod mollusks. (Gastropods are a taxonomic class of animals which consists of snails and slugs of every kind, from the land, from freshwater, and from saltwater.) The paper setting out this taxonomy was published in the journal ''Malacologia''. The system encompasses both living and extinct groups, as well as some fossils whose classification as gastropods is uncertain. The Bouchet & Rocroi system was the first complete gastropod taxonomy that primarily employed the concept of clades, and was derived from research on molecular phylogenetics; in this context a clade is a "natural grouping" of organisms based upon a statistical cluster analysis. In contrast, most of the previous overall taxonomic schemes for gastropods relied on morphological features to classify these animals, and used taxon ranks such as order, superorder ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atlantic Ocean
The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe and Asia from the "New World" of the Americas in the European perception of the World. The Atlantic Ocean occupies an elongated, S-shaped basin extending longitudinally between Europe and Africa to the east, and North and South America to the west. As one component of the interconnected World Ocean, it is connected in the north to the Arctic Ocean, to the Pacific Ocean in the southwest, the Indian Ocean in the southeast, and the Southern Ocean in the south (other definitions describe the Atlantic as extending southward to Antarctica). The Atlantic Ocean is divided in two parts, by the Equatorial Counter Current, with the North(ern) Atlantic Ocean and the South(ern) Atlantic Ocean split at about 8°N. Scientific explorations of the A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesogastropoda
Mesogastropoda was for many years a traditional taxonomic group of snails, an order. The order was composed mostly of sea snails, but it also included some land snails and freshwater snails, all of which were prosobranch gastropod mollusks. This order was introduced by J. Thiele in his work from 1921, it and was used for many decades subsequently. Recent research in malacology however has made it clear that ''Mesogastropoda'' was not a monophyletic taxon, and because of that, the taxon is no longer included in modern classifications. Nonetheless most of the standard texts and field guides on mollusks date from the time period when this classification was still current, and therefore references to mesogastropods or Mesogastropoda are frequently encountered. The lower taxa that were traditionally contained in Mesogastropoda are now mostly placed in the superorder Caenogastropoda. A more detailed account of the taxonomy is given in the articles on Gastropoda and Archaeogastropod ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
