|
Oxystele
''Oxystele'' is a genus of sea snails, marine gastropod mollusks in the family Trochidae, the top snails. Although previously suggested as a subgenus of ''Diloma'', genetic analysis has shown it to be more appropriate as its own genus. Description The depressed conical shell is dark or variegated in color. The large aperture is oblique. The concave columella is arcuate, thin-edged, perfectly simple and curved below. It is above spread over the umbilical area as a rounded, well-defined pad of callus. Patterns of the variegated shell color within the genus ''Oxystele'' are shown in the image : A–C ''Oxystele variegata'' from Namibia, 5 km north of Swakopmund, diameter 22.2 mm (NMSA E6038) D–F ''Oxystele impervia'' from the Western Cape, Groen Rivier, diameter 22.3 mm (NMSA E7353) G–I ''Oxystele'' sp. from the Eastern Cape, Tsitsikamma National Park, diameter 16.5 mm (HVDBM058-10, NMSA W7371); the colour pattern of these specimens suggests ''Oxystele varie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxystele
''Oxystele'' is a genus of sea snails, marine gastropod mollusks in the family Trochidae, the top snails. Although previously suggested as a subgenus of ''Diloma'', genetic analysis has shown it to be more appropriate as its own genus. Description The depressed conical shell is dark or variegated in color. The large aperture is oblique. The concave columella is arcuate, thin-edged, perfectly simple and curved below. It is above spread over the umbilical area as a rounded, well-defined pad of callus. Patterns of the variegated shell color within the genus ''Oxystele'' are shown in the image : A–C ''Oxystele variegata'' from Namibia, 5 km north of Swakopmund, diameter 22.2 mm (NMSA E6038) D–F ''Oxystele impervia'' from the Western Cape, Groen Rivier, diameter 22.3 mm (NMSA E7353) G–I ''Oxystele'' sp. from the Eastern Cape, Tsitsikamma National Park, diameter 16.5 mm (HVDBM058-10, NMSA W7371); the colour pattern of these specimens suggests ''Oxystele varie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxystele Burdigalensis 01
''Oxystele'' is a genus of sea snails, marine gastropod mollusks in the family Trochidae, the top snails. Although previously suggested as a subgenus of ''Diloma'', genetic analysis has shown it to be more appropriate as its own genus. Description The depressed conical shell is dark or variegated in color. The large aperture is oblique. The concave columella is arcuate, thin-edged, perfectly simple and curved below. It is above spread over the umbilical area as a rounded, well-defined pad of callus. Patterns of the variegated shell color within the genus ''Oxystele'' are shown in the image : A–C ''Oxystele variegata'' from Namibia, 5 km north of Swakopmund, diameter 22.2 mm (NMSA E6038) D–F ''Oxystele impervia'' from the Western Cape, Groen Rivier, diameter 22.3 mm (NMSA E7353) G–I ''Oxystele'' sp. from the Eastern Cape, Tsitsikamma National Park, diameter 16.5 mm (HVDBM058-10, NMSA W7371); the colour pattern of these specimens suggests ''Oxystele varie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxystele Variegata
''Oxystele variegata'', common name the variegated topshell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. Description The size of the shell varies between 15 mm and 20 mm. Distribution This marine species occurs off the southern coast of South Africa, from Namibia to North Transkei Transkei (, meaning ''the area beyond he riverKei''), officially the Republic of Transkei ( xh, iRiphabliki yeTranskei), was an unrecognised state in the southeastern region of South Africa from 1976 to 1994. It was, along with Ciskei, a Ban .... References * Steyn, D.G. & Lussi, M. (1998) ''Marine Shells of South Africa. An Illustrated Collector’s Guide to Beached Shells''. Ekogilde Publishers, Hartebeespoort, South Africa, ii + 264 pp. page(s): 24 Branch, G.M. et al. (2002). ''Two Oceans''. 5th impression. David Philip, Cate Town & Johannesburg.* Donald K.M., Kennedy M. & Spencer H.G. (2005) ''The phylogeny and taxonomy of aust ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxystele Tigrina
''Oxystele tigrina'', common name the tiger top shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. Description The size of an adult shell varies between 25 mm and 43 mm. The more or less elevated, imperforate shell has a conoidal shape. It is lusterless blackish or purplish, unicolored or with a few scattered white dots, or yellowish flexiious lines. The yellow or whitish, apical whorls are eroded. The about 6 whorls are spirally coarsely but obsoletely lirate. The large aperture lis oblique with a black border and is silvery within. The simple columella is white or yellowish, bordered by a dull purplish streak. The parietal wall is usually covered by a thin silvery callus. Distribution This marine species occurs along Namibia and the south coast of South Africa South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxystele Sinensis
''Oxystele sinensis'', common name the pink-lipped topshell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. Description The size of the shell varies between 18 mm and 51 mm. Distribution This marine species occurs off False Bay to South Transkei, South Africa. Ecology Especially small individuals of this species that live in the intertidal zone The intertidal zone, also known as the foreshore, is the area above water level at low tide and underwater at high tide (in other words, the area within the tidal range). This area can include several types of habitats with various species o ... are predated upon by rock lobsters. Larger individuals largely escape this predator by migrating to deeper waters, where they find a size refuge. References ''Contributions to the knowledge of South African marine Mollusca''; Annals of The South African Museum vol. 47; 1963* Donald K.M., Kennedy M. & Spencer H.G. (2005) T''he ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxystele Merula
''Oxystele merula'' is a species of sea snail, a marine gastropod mollusk in the family (biology), family Trochidae, the top snails.Bouchet, P. (2013). Oxystele merula (Dillwyn, 1817). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=739283 on 12 February 2014 Description The height of the shell varies between 27 mm and 40 mm, its diameter between 35 mm and 41 mm. The rather depressed conoidal shell is imperforate. Its color is lusterless purplish-black. The conical Spire (mollusc), spire has an eroded yellowish Apex (mollusc), apex. The following Whorl (mollusc), whorl is spirally striate. The last two whorls are smooth. The six whorls are convex. The Suture (anatomy), sutures are distinct. The body whorl is not carinated at the periphery, rather flattened on the base, and usually slightly eroded in front of the Aperture (mollusc), aperture. The large aperture is oblique. The outer Lip (gastropod), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxystele Impervia
''Oxystele impervia'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. Description The size of the shell varies between 12 mm and 18 mm. The imperforate, rather thin shell has a conoidal shape. Its ground color is (usually) whitish, pinkish or bluish, painted with red, brown or blackish in innumerable patterns, but usually in one of the following modes : * longitudinal zigzag dark stripes on a light clear ground * very obliquely descending narrow stripes or lines, generally zigzag or interrupted about the middle of the whorl * narrow spiral articulated bands around the middle of the whorl, the base mottled or barred, and the suture bordered by a row of dark blotches * ground-color pink or purplish, the entire surface variegated by rather narrow spiral bands, finely articulated with red or purple and white The elevated spire is conical. The sutures are distinctly impressed. The apex is minute and acute when not eroded. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxystele Tabularis
''Oxystele tabularis'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. Description The length of the varies between 12 mm and 30 mm. The small, imperforate, rather solid shell has a conical shape. The coloration consists of rather broad longitudinal stripes of dark olive-green or red, alternating with stripes of bright pink, bordered with lines of delicate green, and frequently veined with the same tint The stripes are continuous from suture to base, or are displaced or interrupted at the periphery These axial zigzag markings on a dark or pale brown background are characteristic. The spire is low-conic The eroded apex is orange-colored. The following whorl, if eroded, shows iridescent blue-green nacre, which is spirally grooved. The about 5 whorls are smooth and rounded when not eroded. The body whorl is obtusely subangulate at the periphery. The base of the shell is rather flattened, radiately striped with red and white, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxystele Fulgurata
''Oxystele fulgurata'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. Description The height of the shell attains 19 mm, its diameter 18 mm. The imperforate, rather thin shell has a conoidal shape. Its apex is subacute . The 5½ whorls are moderately convex, nearly smooth, the upper ones eroded, spirally striate and yellow. The remainder are margined and compressed at the sutures. These are greenish, ornamented with narrow brownish, obliquely radiating, zigzag lines. The body whorl is rounded and is slightly descending. The subovate aperture is sulcate within. The arcuate columella is compressed. The umbilical tract is white and callous. (desc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diloma
''Diloma'' is a genus of medium-sized sea snails, marine gastropod mollusks in the family Trochidae, the top snails.Bouchet, P. (2010). Diloma Philippi, 1845. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=391149 on 2011-07-02 There is also a genus ''Diloma'', F.H.Wind & P.Cepek, 1979 a genus of phytoplankton in the class Prymnesiophyceae Description The solid shell is imperforate and depressed globose. It is slate-colored or black, sometimes (especially if worn) reddish or brownish. The conic spire is short. The apex is acute, usually reddish. The sutures are linear. The five whorls are slightly convex, rapidly increasing and spirally obsoletely striate. The body whorl is usually depressed or subconcave below the suture. The base of the shell is rounded, eroded and iridescent in front of the aperture. The aperture is huge, oblique iridescent. The outer lip is rather thin, not black-margined within; but bordered by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gibbula Zonata
''Gibbula zonata'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. Description The size of the shell varies between 6 mm and 10 mm. The rather solid shell is imperforate but excavated at the place of the umbilicus. It has a depressed-conical shape. It is whitish, with numerous spiral bauds and lines of purplish-brown. The surface is very lightly obliquely striate, closely, densely finely spirally striate, generally with three strong carinae, one at periphery, the others above. The about 5 whorls are convex, those of the upper surface bicarinate. The convex body whorl is carinate or subcarinate. The oblique aperture is rounded-quadrangular. It is nacreous inside with slight sulci at the positions of the external carina. The columella is a little straightened. Distribution This species occurs in the Atlantic Ocean off Namibia and the western coast of South Africa; in the Indian Ocean off the Agulhas Bank. References P. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. There are many thousands of species of sea snails and slugs, as well as freshwater snails, freshwater limpets, and land snails and slugs. The class Gastropoda contains a vast total of named species, second only to the insects in overall number. The fossil history of this class goes back to the Late Cambrian. , 721 families of gastropods are known, of which 245 are extinct and appear only in the fossil record, while 476 are currently extant with or without a fossil record. Gastropoda (previously known as univalves and sometimes spelled "Gasteropoda") are a major part of the phylum Mollusca, and are the most highly diversified class in the phylum, with 65,000 to 80,000 living snail and slug species. The anatomy, behavior, feeding, and re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
