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Seguenziidae
Seguenziidae is a family (biology), family of very small deepwater sea snails, marine (ocean), marine gastropod mollusks in the superfamily Seguenzioidea (according to the Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005), 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 (gastropod), lip has often a tooth-like fold. The outer lip has characteristically one to three concave notches (exc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seguenzioidea
Seguenzioidea is a family (biology), superfamily of sea snails, marine (ocean), 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 Turrid ... [...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 catalogue and list of names of marine organisms. Content The content of the registry is edited and maintained by scien ... 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 (ocean), marine gastropod mollusks in the family (biology), 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 Whorl (mollusc), whorls. The shell contains no spiral Lira (mollusc), lirae. The U-shaped posterior sinus is shallow. The basal sinus is present, but there is no anterolateral sinus. The Columella (gastropod), columella has no sinus or tooth. Tha Aperture (mollusc), 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'' Hoff ... [...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 catalogue and list of names of marine organisms. Content The content of the registry is edited and maintained by scien ... 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 ITISWor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seguenzia Eidalima
''Seguenzia eidalima'' is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.Marshall, B. (2013). ''Seguenzia eidalima'' B.A. Marshall, 1991. Retrieved through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492376 on 2013-06-10Intergovernmental Oceanographic Commission (IOC) of UNESCO. The Ocean Biogeographic Information System (OBIS) Description The length of the shell attains 31 mm. Distribution This marine species occurs off New Caledonia New Caledonia ( ; ) is a group of islands in the southwest Pacific Ocean, southwest of Vanuatu and east of Australia. Located from Metropolitan France, it forms a Overseas France#Sui generis collectivity, ''sui generis'' collectivity of t .... References External links Marshall, B. A. (1991). Mollusca Gastropoda: Seguenziidae from New Caledonia and the Loyalty Islands. In A. Crosnier & P. Bouchet (Eds) Résultats des campagnes M ... [...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 catalogue and list of names of marine organisms. Content The content of the registry is edited and maintained by scien ... 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] |
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 catalogue and list of names of marine organisms. Content The content of the registry is edited and maintained by scien ... 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] |
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 (; : radulae or radulas) is an anatomical structure used by mollusks 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 enters .... Species Species within the genus ''Thelyssina'' include: *'' Thelyssina sterrha'' Marshall, 1983 References {{Taxonbar, from=Q7781158 Seguenziidae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guttula
''Guttula'' is a genus of sea snails, marine (ocean), marine gastropod molluscs in the family (biology), family Seguenziidae. Description (Original description by Schepman) The small, shell has a conoidal shape. It is smooth, pearly, and perforate. The Aperture (mollusc), aperture is rounded, with an angle at the base. The Operculum (gastropod), 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 Lira (mollusc), lirae, no basal, posterior or anterolateral sinus, no columellar sinus. The Aperture (mollusc), aperture has a circular shape. The Columella (gastropod), columellar tooth is absent. There is no umbilical septum. The shell has punctate microsculpture. Radula: the rachidian tooth is broader than high and has the lateral wings prominent. The ... [...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] |
Mollusk
Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The number of additional fossil species is estimated between 60,000 and 100,000, and the proportion of undescribed species is very high. Many taxa remain poorly studied. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms. They are highly diverse, not just in size and anatomical structure, but also in behaviour and habitat, as numerous groups are freshwater and even terrestrial species. The phylum is typically divided into 7 or 8 taxonomic classes, of which two are entirely extinct. Cephalopod molluscs, such as squid, cuttlefish, and octopuses, are among the most neurologically advanced of all invertebrates—and either the giant squid or the colossal squid is the largest known extant i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archaeogastropoda
Archaeogastropoda (also known as Aspidobranchia) was a taxonomic order of snails used in older classifications of gastropods, i.e. snails and slugs. Archeogastropoda are primarily marine prosobranch gastropod mollusks, mainly herbivores, typically having two gills and a double-chambered heart, with the eggs and sperm discharged directly into the water, excepting terrestrial species. They were traditionally regarded as a relatively primitive group. This older classification of the gastropods is based on the classification of Johannes Thiele (1925). This classification was not based on true phylogenetic relationships, but on more general affinities between the groups. In the last few years, two new cladistic taxonomies of the gastropods have been published (in 1997 and 2005). This has led to an extensive reclassification of gastropod taxa. The taxon Archaeogastropoda was found to be a paraphyletic group, and therefore unacceptable in a strictly cladistic classification. In the 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
