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Asthelys Careyi
''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] |
Robert Boog Watson
Robert Boog Watson FRSE (26 September 1823 – 23 June 1910) was a Scottish malacologist and minister of the Free Church of Scotland best known as the author of the report on the Scaphopoda and Gastropoda collected during the H.M.S. ''Challenger'' expedition to survey the world's oceans from 1873 to 1876. Watson also described various Opisthobranchia from Madeira. Life He was born in Burntisland in Fife, the son of the Rev Dr Charles Watson DD (1794-1866) of Burntisland and Isabella Boog. His brother, Sir Patrick Heron Watson was an eminent surgeon and a pioneer of modern dentistry. The family moved permanently to Edinburgh around 1840, living at 19 Royal Terrace on Calton Hill. He was educated at Edinburgh Academy. He served as Chaplain to the Highland Brigade during the Crimean War, and later in Madeira. In 1858 he was living with his wife in Bombay in India. He was elected a Fellow of the Royal Society of Edinburgh in 1862. During his stay in Edinburgh he lived wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 enters the esophagus. The radula is unique to the molluscs, and is found in every class of mollusc except the bivalves, which instead use cilia, waving filaments that bring minute organisms to the mouth. Within the gastropods, the radula is used in feeding by both herbivorous and carnivorous snails and slugs. The arrangement of teeth ( denticles) on the radular ribbon varies considerably from one group to another. In most of the more ancient lineages of gastropods, the radula is used to graze, by scraping diatoms and other microscopic algae off rock surfaces and other substrates. Predatory marine snails such as the Naticidae use the radula plus an acidic secretion to bore through the shell of other molluscs. Other predatory marine snails ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asthelys Simplex
''Asthelys simplex'' is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.Rosenberg, G. (2012). ''Asthelys simplex'' (Watson, 1879). Retrieved through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492405 on 2013-04-14 Description The shell grows to a height of 6.5 mm. The shell is a rather narrow flat-based cone that is sharply angulated. The shell is small, thin, delicate, smooth, glassy, and nacreous under a thin white calcareous surface. Sculpture: There are longitudinals, which are faint, hairlike and sinuated, showing the old lines of growth. The whole surface has traces of faint, rounded, and irregular spirals. At the bottom of each whorl is a flat puckered band about 0.25 mm. broad, whose upper edge projects sharply, especially on the upper whorls, and whose lower edge is a slight narrow flange, which forms a sharp carina at the periphery. This band forms th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asthelys Semiplicata
''Asthelys semiplicata'' is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.WoRMS (2012). ''Asthelys semiplicata'' Marshall, 1991. Retrieved through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492310 on 2013-04-14Intergovernmental Oceanographic Commission (IOC) of UNESCO. The Ocean Biogeographic Information System (OBIS) Distribution This marine species occurs off New Caledonia ) , anthem = "" , image_map = New Caledonia on the globe (small islands magnified) (Polynesia centered).svg , map_alt = Location of New Caledonia , map_caption = Location of New Caledonia , mapsize = 290px , subdivision_type = Sovereign st ..., the Loyalty Islands and off Queensland, Australia at depths between 1330 m and 1620 m. References * Marshall B.A. (1991). ''Mollusca Gastropoda : Seguenziidae from New Caledonia and the Loyalty Islands''. In A. Crosnier & P. Bouchet (Eds) Résul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asthelys Nitidula
''Asthelys nitidula'' is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.WoRMS (2012). ''Asthelys nitidula''. Retrieved through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492309 on 2013-04-14Intergovernmental Oceanographic Commission (IOC) of UNESCO. The Ocean Biogeographic Information System (OBIS) References * Marshall 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. External links Encyclopedia of LifeWorld Register of Marine Species nitidula ''Nitidula'' is a genus of sap-feeding beetles in the family Nitidulidae The sap beetles, also known as Nitidulidae, are a family (biology), family of beetles. They are small (2–6 mm) ovoid, usually dull-coloured beetles, wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asthelys Munda
''Asthelys munda'' is a species of sea snail, a marine gastropod mollusk in the family Seguenziidae. This species is spelled as ''Asthelys mundus'' in CLEMAM. Description (Original description by Watson) The height of the shell attains 3.3 mm. The shell is broadly conical, flat on the base, and sharply angulated. It is small, thin, delicate, smooth, glossy, and nacreous under a thin white calcareous surface. Sculpture: There are longitudinals, which are very faint but still sharp, sinuated, showing the old lines of growth. There are over the whole surface very faint traces of spirals. At the bottom of each whorl, about 0.25 mm. above the suture, is a sharp narrow thread, which on the body whorl is bordered below by a second, rather higher and sharper, which forms the carina, and which on the spire is buried by the overlap of the succeeding whorl. On the base of the shell there are about eleven fine spirals, within which is a strong furrow, and a projecting, cren ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asthelys Hyeresensis
''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] |
Asthelys Depressa
''Asthelys depressa'' is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.WoRMS (2012). ''Asthelys depressa''. Retrieved through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492311 on 2013-04-14Intergovernmental Oceanographic Commission (IOC) of UNESCO. The Ocean Biogeographic Information System (OBIS) Distribution This marine species occurs off New Caledonia ) , anthem = "" , image_map = New Caledonia on the globe (small islands magnified) (Polynesia centered).svg , map_alt = Location of New Caledonia , map_caption = Location of New Caledonia , mapsize = 290px , subdivision_type = Sovereign st ... and the Loyalty Islands. References ;Notes ;Sources * Marshall 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asthelys Careyi
''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] |
Asthelys Antarctica
''Asthelys antarctica'' is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family 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 ....Rosenberg, G. (2012). ''Asthelys antarctica''. Retrieved through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492407 on 2013-04-14 Description The shell attains a height of 5.8 mm. Distribution This species occurs in Antarctic waters off the South Shetland Islands at a depth of about 3700 m. References Malacolog: ''Asthelys antarctica'' External links Antarctic InvertebratesEncyclopedia of LifeUSNM Invertebrate Zoology Mollusca CollectionWorld Register of Marine Species antarctica Gastropods described in 1988 {{Seguenziidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aperture (mollusc)
The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc. The term ''aperture'' is used for the main opening in gastropod shells, scaphopod shells, and also for ''Nautilus'' and ammonite shells. The word is not used to describe bivalve shells, where a natural opening between the two shell valves in the closed position is usually called a ''gape''. Scaphopod shells are tubular, and thus they have two openings: a main anterior aperture and a smaller posterior aperture. As well as the aperture, some gastropod shells have additional openings in their shells for respiration; this is the case in some Fissurellidae (keyhole limpets) where the central smaller opening at the apex of the shell is called an orifice, and in the Haliotidae (abalones) where the row of respiratory openings in the shell are also called orifices. In gastropods In some prosobranch ... [...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] |
