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Plesiotrochus
''Plesiotrochus'' is a genus of sea snails, marine gastropod mollusks in the family Plesiotrochidae. Plesiotrochus was originally placed in the superfamily Cerithioidea but was subsequently transferred to the superfamily Campaniloidea by Healy (1993). Description The shell have an elongate, conical shape. Their length of rather small (between 5 mm and 10 mm, with one species up to 24 mm). The imperforate whorls are flat to concave. The subrhomboidal aperture is smooth within and prolonged by a short siphonal canal. The outer lip is subrostrate in the middle. The columella and the siphonal canal are twisted. The sculpture shows conspicuous ribs with varices or just spirals. The operculum is eccentric. Distribution The species occur in the Indo-Pacific. Species Species within the genus ''Plesiotrochus'' include: * ''Plesiotrochus acutangulus'' (Yokoyama, 1924) * ''Plesiotrochus calliostomoides'' (Thiele, 1929) * ''Plesiotrochus crinitus'' Thiele, 1930 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plesiotrochidae
Plesiotrochidae is a family of sea snails, marine gastropod molluscs in the clade Sorbeoconcha Sorbeoconcha is a taxonomic clade of snails, i.e. gastropods, mainly marine species with gills and opercula, within the clade Caenogastropoda. The taxon Sorbeoconcha was named by Winston Ponder and David R. Lindberg in 1997. Taxonomy 1997 taxo .... According to the taxonomy of the Gastropoda by Bouchet & Rocroi (2005) the family Plesiotrochidae has no subfamilies. Genera Genera within the family Plesiotrochidae include: * '' Plesiotrochus'' P. Fischer, 1878 * '' Trochocerithium'' Sacco, 1897 ;Genera brought into synonymy: * ''Hemicerithium'' Cossmann, 1893: synonym of ''Plesiotrochus'' Fischer, 1878 * ''Hypotrochus'' Cotton, 1932: synonym of ''Plesiotrochus'' Fischer, 1878 References * Houbrick R.S. 1990. ''Aspect of the anatomy of Plesiotrochus (Plesiotrochidae, fam. n.) and its systematic position in Cerithioidea (Prosobranchia Caenogastropoda).'' pp. 237–249, in: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plesiotrochus Monachus
''Plesiotrochus monachus'' is a species of sea snail, a marine gastropod mollusk in the family Plesiotrochidae. Distribution This species occurs from New South Wales to Fremantle, Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma .... References {{Taxonbar, from=Q14123781 Plesiotrochidae Gastropods of Australia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siphonal Canal
The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water is drawn into the mantle cavity and over the gill and which serves as a chemoreceptor to locate food. Siphonal canals allow for active transport of water to sensory organs inside the shell. Organisms without siphonal canals in their shells rely on passive or diffuse transport or water into their shell. Those with siphonal canals have a direct inhalant stream of water that interacts with sensory organs to detect concentration and direction of a stimulus, such as food or mates. In certain groups of carnivorous snails, where the siphon is particularly long, the structure of the shell has been modified in order to house and protect the soft structure of the siphon. Thus the siphonal canal is a semi-tubular extension of the aperture of the s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Operculum (gastropod)
The operculum (; ) is a corneous or calcareous anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails, and also in a few groups of land snails; the structure is found in some marine and freshwater gastropods, and in a minority of terrestrial gastropods, including the families Helicinidae, Cyclophoridae, Aciculidae, Maizaniidae, Pomatiidae, etc. The operculum is attached to the upper surface of the foot and in its most complete state, it serves as a sort of "trapdoor" to close the aperture of the shell when the soft parts of the animal are retracted. The shape of the operculum varies greatly from one family of gastropods to another. It is fairly often circular, or more or less oval in shape. In species where the operculum fits snugly, its outline corresponds exactly to the shape of the aperture of the shell and it serves to seal the entrance of the shell. Many families have opercula that are reduced in size, and which a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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