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Lissospira Chalossensis
''Lissospira'' is a genus of sea snails, marine (ocean), marine gastropod mollusks in the family (biology), family Skeneidae. Description This genus was proposed for a group of deepwater species which had been erroneously referred to ''Cyclostrema''. They are small, thin, of rather delicate texture (with the exception of ''Lissospira rarinota''), opaque white, and slightly lustrous. Their shell consists of few convex Whorl (mollusc), whorls forming an elevated Spire (mollusc), spire, with a relatively large, prominent nuclear whorl and a large body whorl. The Suture (anatomy), suture is deep. The Umbilicus (mollusc), umbilicus is small, deep, and does not show any whorls. The Aperture (mollusc), aperture is somewhat oblique, circular with a slight sutural angle, and not modified by the body whorl to which the simple, continuous peritreme is but slightly attached. The aperture often has an indistinct thread just within the inner Lip (gastropod), lip, fading out above and below, s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. 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 of an ancestral taxon are grouped together (i.e. Phylogeneti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 the esophagus. The radula is unique to the mollusks, and is found in every class of mollusk 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 mollusks. Other predatory marine snails, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lissospira Valvata
''Lissospira valvata'' is a species of sea snail, a marine gastropod mollusk in the family Skeneidae.Rosenberg, G. (2012). ''Lissospira valvata'' (Dall, 1927). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=532983 on 2012-09-01 Description The size of the shell attains 2.6 mmn its diameter also 2.6 mm. (Original description) The shell is small, white, smooth, and polished, featuring about four well-rounded whorls separated by a distinct but not deep suture. The spire is only moderately elevated, and the protoconch is small and glassy. The base is rounded and smooth, containing a small perforate umbilicus. The aperture is circular and slightly oblique, with simple, thin margins. However, the inner lip near the umbilicus is slightly reflected and thickened. Some of the immature specimens display a slight angulation around the umbilical depression. Distribution This species occurs in the Atlantic Ocean off ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lissospira Striata
''Lissospira striata'' is a species of sea snail, a marine gastropod mollusk in the family Skeneidae.Rosenberg, G. (2012). ''Lissospira striata'' Bush, 1897. Accessed through: World Register of Marine Species aon 2012-09-01 Description The height of the shell attains 1.5 mm, its diameter 2 mm. The shell consists of about three convex Whorl (mollusc), whorls forming a comparatively low, somewhat depressed spire. The entire surface below the relatively large, little raised, smooth nuclear whorl, is covered with raised, rounded, well-separated, revolving microscopic threads, most distinct on the base. The small umbilicus is scarcely more than a chink. The aperture and the operculum are typical. Distribution This species occurs in the Atlantic Ocean off New England, United States, found off Martha's Vineyard Martha's Vineyard, often simply called the Vineyard, is an island in the U.S. state of Massachusetts, lying just south of Cape Cod. It is known for being a p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lissospira Proxima
''Lissospira'' is a genus of sea snails, marine gastropod mollusks in the family Skeneidae. Description This genus was proposed for a group of deepwater species which had been erroneously referred to ''Cyclostrema''. They are small, thin, of rather delicate texture (with the exception of '' Lissospira rarinota''), opaque white, and slightly lustrous. Their shell consists of few convex whorls forming an elevated spire, with a relatively large, prominent nuclear whorl and a large body whorl. The suture is deep. The umbilicus is small, deep, and does not show any whorls. The aperture is somewhat oblique, circular with a slight sutural angle, and not modified by the body whorl to which the simple, continuous peritreme is but slightly attached. The aperture often has an indistinct thread just within the inner lip, fading out above and below, so that it extends but about halfway round the aperture. It is much nearer the edge along the columellar margin than at the ends and is evide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lissospira Ornata
''Lissospira ornata'' is a species of sea snail, a marine gastropod mollusk in the family Skeneidae.Rosenberg, G. (2012). ''Lissospira ornata'' (A. E. Verrill, 1884). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=532980 on 2012-09-01 Description The diameter of the shell attains 2.6 mm. This species agrees in form and condition of the umbilical region with the '' Lissospira dalli''. But it is very peculiarly marked on the base by thin, impressed lines, running obliquely and crossing the concentric spiral lines at a large angle, so as to produce a sort of "herring-bone" pattern as shown in the figure. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lissospira Larva
''Lissospira'' is a genus of sea snails, marine gastropod mollusks in the family Skeneidae. Description This genus was proposed for a group of deepwater species which had been erroneously referred to ''Cyclostrema''. They are small, thin, of rather delicate texture (with the exception of '' Lissospira rarinota''), opaque white, and slightly lustrous. Their shell consists of few convex whorls forming an elevated spire, with a relatively large, prominent nuclear whorl and a large body whorl. The suture is deep. The umbilicus is small, deep, and does not show any whorls. The aperture is somewhat oblique, circular with a slight sutural angle, and not modified by the body whorl to which the simple, continuous peritreme is but slightly attached. The aperture often has an indistinct thread just within the inner lip, fading out above and below, so that it extends but about halfway round the aperture. It is much nearer the edge along the columellar margin than at the ends and is evide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lissospira Depressa
''Lissospira depressa'' is a species of sea snail, a marine gastropod mollusk in the family Skeneidae.Rosenberg, G. (2012). ''Lissospira depressa''. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=532979 on 2012-09-01 Description The diameter of the shell attains , its diameter also . (Original description) The shell is small and depressed turbinate, appearing white and smooth. It possesses about three whorls, with the body whorl being much the largest. The whorls are well rounded, and the suture is distinct, though not deep. The base is rounded. The aperture is somewhat oblique, angulated above and below. The lips are simple, thin, not reflected, and are united by a layer of enamel over the body. The umbilicus is perforate, and its verge is marked by a distinct angle, not surrounded by any spiral sculpture. Distribution This species occurs in the Atlantic Ocean off Georgia, United States The United States o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lissospira Dalli
''Lissospira dalli'' is a small species of sea snail, a marine gastropod mollusk in the family Skeneidae.Rosenberg, G. (2012). ''Lissospira dalli'' (A. E. Verrill, 1882). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=532978 on 2012-09-01 Description The height of the yellowish white shell attains 2 mm, its diameter 2.25 mm. The shell has a trochiform shape and contains 3½ whorls that enlarge rapidly. They are well rounded, with a deeply impressed suture. The apical whorl is a little prominent, visible in a side-view. The body whorl is ventricose. The aperture is nearly circular. The outer lip shows a slight angle anteriorly. The columella is evenly curved The base of the shell contains seven or eight spiral incised lines. They number seven or eight and cover the base of the shell and the umbilical depression. The umbilicus is imperforate or represented by a very narrow chink. The surface of the pale shell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lissospira Convexa
''Lissospira convexa'' is a species of sea snail, a marine gastropod mollusk in the family Skeneidae. Description Distribution The Lissospira convexa is commonly found in the North Atlantic Ocean The Atlantic Ocean is the second largest of the world's five borders of the oceans, oceanic divisions, with an area of about . It covers approximately 17% of Earth#Surface, Earth's surface and about 24% of its water surface area. During the ... References convexa Gastropods described in 1897 {{Trochoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lissospira Conica
''Lissospira conica'' is a species of sea snail, a marine gastropod mollusk in the family Skeneidae. Description The height of the shell attains 2 mm, its diameter 1.7 mm. (Original description) The shell is small, white, smooth, and polished. It is conic, with a little more than four moderately rounded whorls. The immature specimens exhibit an angle at the margin of the base on which the suture is laid, but this disappears on the last adult whorl. The suture is distinct, though not deep. The base is rounded, and the aperture is also rounded. The lips are united over the body by a thin wash of enamel. In the adult, the inner lip is reflected over and nearly closes the small perforate umbilicus, which is not surrounded by any spiral sculpture. Distribution This particular species occurs in the Atlantic Ocean off Georgia, United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
