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Calliostoma
''Calliostoma'' is a genus of small to medium-sized sea snails with gills and an operculum, marine gastropod molluscs within the family Calliostomatidae, the Calliostoma top snails. Previously this genus was placed within the family Trochidae. ''Calliostoma'' is the type genus of the family Calliostomatidae. Taxonomy The name of this genus is derived from the Greek words ''kallos'' (beautiful) and ''stoma'' (mouth), referring to the pearly aperture of the shell. The genus ''Calliostoma'' is known in fossil records from the Upper Cretaceous onwards. As of 2022, ''Calliostoma'' is treated as a very broad genus of about 300 accepted species. While current information is too fragmentary to assign all species in a revised genus, it is expected to be broken up and (some) subgenera will be elevated to the status of genus. A complete listing can be found at the list of ''Calliostoma'' species. Description The rather thin, acute, coeloconoid (=approaching conical shape bu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Calliostoma Species
, the following species of molluscs are recognised in the genus ''Calliostoma''. A *''Calliostoma adelae'' *''Calliostoma admirandum'' *''Calliostoma adspersum'' *'' Calliostoma aequisculptum'' *''Calliostoma africanum'' *''Calliostoma agalma'' *'' Calliostoma agrigentinum'' *''Calliostoma aikeni'' *''Calliostoma alboregium'' *''Calliostoma alisi'' *''Calliostoma allporti'' *''Calliostoma altena'' *''Calliostoma alternatum'' *'' Calliostoma alternum'' *''Calliostoma amamiense'' *''Calliostoma anderssoni'' *''Calliostoma angolense'' *'' Calliostoma annulatum'' *''Calliostoma anseeuwi'' *''Calliostoma antonii'' *'' Calliostoma apicinum'' *''Calliostoma apicisuperi'' *''Calliostoma aporia'' *'' Calliostoma aprosceptum'' *''Calliostoma argentum'' *''Calliostoma arx'' *'' Calliostoma aulicum'' *'' Calliostoma aurora'' *'' Calliostoma axelolssoni'' B *''Calliostoma babelicum'' *''Calliostoma baccatum'' *'' Calliostoma bairdii'' *''Calliostoma barbour ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calliostomatidae
Calliostomatidae is a family of sea snails within the superfamily Trochoidea and the clade Vetigastropoda.Gofas, S. (2013). Calliostomatidae. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=382180 on 2013-07-08 Description The Calliostomatidae are unusually diverse. They are characterized by a stepped spire and a pointy aperture. They may possess or lack an umbilicus. The collumella is sometimes thicker, partially covering the aperture. The spiral whorls can differ between narrow and robust. They inhabit a wide range of ocean habitats, from the intertidal zone to mid- bathyal depths. Taxonomy This taxon was long considered to be a subfamily of the Trochidae. 2005 taxonomy This family consists of two following subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005): * subfamily Calliostomatinae Thiele 1924 (1847) ** tribe Calliostomatini Thiele 1924 (1847) - synonym: Ziziphininae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calliostoma Ligatum
''Calliostoma ligatum'', common name the blue top snail, is a small prosobranch trochid gastropod mollusk in the family Calliostomatidae, the Calliostoma top snails. Description The conical, solid shell has well-rounded globose whorls with six to eight smooth spiral cords per whorl and no umbilicus. Its base is flattened. The surface is encircled by numerous spiral smooth riblets, their interstices closely finely obliquely striate. There are usually seven to nine riblets on the penultimate whorl, about nine on the base. The spire is conic. The apex is acute. The sutures are impressed. There are about seven, convex whorls. The body whorl is rounded (or a trifle angled) around the lower part, slightly convex beneath. The oblique aperture is rounded. The outer lip is fluted within, with a beveled opaque white submargin. The throat is pearly and iridescent;. The simple columella is arcuate. The base color is chocolate brown to mauve with light tan raised cords, and the aperture ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calliostoma Conulus
''Calliostoma conulus'' is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae. This is the type species of the genus. The variety ''Calliostoma conulus'' var. ''livida'' Dautzenberg, 1927 is a synonym of '' Calliostoma lividum'' Dautzenberg, 1927 Description The shell has an elevated-conical shape. The height of the shell varies between 10 mm and 35 mm. The shell is carinated at the periphery. It has a yellow or delicate flesh color, with obscure clouds or macula. It is alternately whitish and brown below the suture and painted on the peripheral rib in the same alternate manner. The surface of the shell is highly polished. The apical whorl is smooth, the next four or five whorls are densely granulate (granules in 4 or 5 series). The next whorl is generally spirally ribbed. The following whorls are smooth, or with very obscure traces of spiral lines. The base of the shell is flat, smooth, save for 3 to 6 concentric articulated ribl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calliostoma Bairdii
''Calliostoma bairdii'', common name the Baird's top shell, is a species of sea snail with an operculum, a marine gastropod mollusk in the family Calliostomatidae, the calliostoma top snails.Rosenberg, G. (2010). ''Calliostoma bairdii'' Verrill & Smith, 1880. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=160194 on 10 December 2012 Distribution North West Atlantic. Range covers both subprovinces of Acadian and Virginian. Range: 41.67°N to 34.65°N; 75.58°W to 65.77°W. Distribution: USA: Massachusetts, New Jersey, Maryland, Virginia, North Carolina; 41.67°N to 34.65°N; 75.58°W to 65.77°W. Description The maximum recorded shell length is 33 mm.Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". '' PLoS ONE'' 5(1): e8776. . The large, strong shell is regularly conical, with a flattened base, and lacks an umbilicus, It is yellowish white or light yellow, with mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calliostoma Occidentale
''Calliostoma occidentale'', common name the boreal topsnail, is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae. Description The size of the shell varies between 6 mm and 17 mm. The shell is rather small, thin, imperforate, and opalescent with a shining surface. It is strongly sculptured above with smooth, yellowish spiral ribs, narrower than their interstices, numbering 3 or 4 on each of the 7 to 8 whorls. The periphery is very bluntly subangular. The base of the shell is nearly flat, with a few ribs around the axis and at the periphery, otherwise it is smooth. The acute spire is elevated. The apical whorl is minute, smooth, and rounded. Three whorls follow which are beaded on the spiral ribs. The sutures are impressed. The pearly aperture is rather rounded. The narrow columella is arcuate, not dentate or truncate at its base. Distribution This species has a wide distribution. It occurs in European waters, the Northwest Atlanti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochidae
The Trochidae, common name top-snails or top-shells, are a family of various sized sea snails, marine gastropod molluscs in the subclass Vetigastropoda. This family is commonly known as the top-snails because in many species the shell resembles a toy spinning top. Taxonomy The family Trochidae consists of the following subfamilies: * Alcyninae Williams, Donald, Spencer & Nakano, 2010 * Cantharidinae Gray, 1857 * Carinotrochinae S.-Q. Zhang, J. Zhang & S.-P. Zhang, 2020 * Chrysostomatinae Williams, Donald, Spencer & Nakano, 2010 * Fossarininae Bandel, 2009 * Halistylinae Keen, 1958 * Kaiparathininae B. A. Marshall, 1993 * Monodontinae Gray, 1857 * Stomatellinae Gray, 1840 * Trochinae Rafinesque, 1815 * Umboniinae H. Adams & A. Adams, 1854 (1840) Additionally, the following genera have not yet been placed in any subfamily: * ''Callumbonella'' Thiele, 1924 * †'' Coeloconulus'' Nützel, 2012 * ''Enida'' A. Adams, 1860 * †'' Eocalliostoma'' O. Haas, 1953 * †'' Fagna ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Snail
Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the absence of a visible shell. Definition Determining whether some gastropods should be called sea snails is not always easy. Some species that live in brackish water (such as certain neritids) can be listed as either freshwater snails or marine snails, and some species that live at or just above the high tide level (for example species in the genus '' Truncatella'') are sometimes considered to be sea snails and sometimes listed as land snails A land snail is any of the numerous species of snail that live on land, as opposed to the sea snails and freshwater snails. ''Land snail'' is the common name for terrestrial gastropod mollusks that have shells (those without shells are known .... Anatomy Sea snails are a very large group o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bathyal Zone
The bathypelagic zone or bathyal zone (from Greek βαθύς (bathýs), deep) is the part of the open ocean that extends from a depth of below the ocean surface. It lies between the mesopelagic above, and the abyssopelagic below. The bathypelagic is known as the midnight zone because of the lack of sunlight; this feature does not allow for photosynthesis-driven primary production, preventing growth of phytoplankton or aquatic plants. Although larger by volume than the photic zone, our knowledge of the bathypelagic zone remains limited by our ability to explore the deep ocean. Physical characteristics The bathypelagic zone is characterized by a nearly constant temperature of approximately and a salinity range of 33-35 g/kg. This region has little to no light, because sunlight does not reach this deep in the ocean and bioluminescence is limited. The hydrostatic pressure in this zone ranges 100-400 atmospheres (atm), due to the increase of 1 atm for every 10 m depth. It is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Veliger
A veliger is the planktonic larva of many kinds of sea snails and freshwater snails, as well as most bivalve molluscs (clams) and tusk shells. Description The veliger is the characteristic larva of the gastropod, bivalve and scaphopod taxonomic classes. It is produced following either the embryonic or trochophore larval stage of development. In bivalves the veliger is sometimes referred to as a D-stage (early in its development) or pediveliger (late in its development) larva. This stage in the life history of these groups is a free-living planktonic organism; this mode of life potentially enhances dispersal to new regions far removed from the adult mollusks that produced the larvae. The general structure of the veliger includes a shell that surrounds the visceral organs of the larva (e.g., digestive tract, much of the nervous system, excretory organs) and a ciliated velum that extends beyond the shell as a single or multi-lobed structure used for swimming and particu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plankton
Plankton are the diverse collection of organisms found in water (or air) that are unable to propel themselves against a current (or wind). The individual organisms constituting plankton are called plankters. In the ocean, they provide a crucial source of food to many small and large aquatic organisms, such as bivalves, fish and whales. Marine plankton include bacteria, archaea, algae, protozoa and drifting or floating animals that inhabit the saltwater of oceans and the brackish waters of estuaries. Freshwater plankton are similar to marine plankton, but are found in the freshwaters of lakes and rivers. Plankton are usually thought of as inhabiting water, but there are also airborne versions, the aeroplankton, that live part of their lives drifting in the atmosphere. These include plant spores, pollen and wind-scattered seeds, as well as microorganisms swept into the air from terrestrial dust storms and oceanic plankton swept into the air by sea spray. Though m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coelenterate
Radiata or Radiates is a historical taxonomic rank that was used to classify animals with radially symmetric body plans. The term Radiata is no longer accepted, as it united several different groupings of animals that do not form a monophyletic group under current views of animal phylogeny. The similarities once offered in justification of the taxon, such as radial symmetry, are now taken to be the result of either incorrect evaluations by early researchers or convergent evolution, rather than an indication of a common ancestor. Because of this, the term is used mostly in a historical context. In the early 19th century, Georges Cuvier united Ctenophora and Cnidaria in the Radiata ('' Zoophytes''). Thomas Cavalier-Smith, in 1983, redefined Radiata as a subkingdom consisting of Myxozoa, Placozoa, Cnidaria and Ctenophora. Lynn Margulis and K. V. Schwartz later redefined Radiata in their '' Five Kingdom'' classification, this time including only Cnidaria and Ctenophora. This defi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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