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Helicinidae
Helicinidae is a family of small tropical land snails which have an operculum. They are terrestrial operculate gastropod mollusks in the superfamily Helicinoidea. These snails are not at all closely related to the air-breathing land snails, despite a superficial similarity of the shells. The name "Helicinidae" immediately reminds most people of "Helicidae", the most popular group of land snails including e.g. Helix pomatia, but the important two letters "ni" only from the Latin diminutive of the latter name alluding to superficial similarities of otherwise completely different things. Distribution These snails are found in tropical and subtropical areas but they have an odd distribution: they are restricted to the Caribbean islands and some Indo-Pacific and Pacific islands, as well as the edge of the Asian and Australian continents. Some species are found in the southern United States, from Louisiana to Florida; others in Central and South America. Taxonomy Helicinidae belon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicina Rhodostoma
''Helicina rhodostoma'' is a species of tropical land snail with an operculum, a terrestrial gastropod mollusk in the family Helicinidae. Shell description Robert John Lechmere Guppy (1868) Guppy R. J. L. (1868). "On the terrestrial mollusks of Dominica and Grenada, with an account of some new species from Trinidad". '' Annals and Magazine of Natural History'' (4)1429442. noted that this species is not found above 1000 m altitude. Three names have been used for this species, but material by Robinson et al. (2009) shows that the forms intergrade, illustrating the variability of the species. In general, populations from higher altitudes have a more pronounced columellar spine, and are more likely to have a red to reddish-orange aperture, as seen in typical ''Helicina rhodostoma''. Populations from drier, coastal areas tend to lack a columellar spine, and the aperture may be white or yellow. Juvenile specimens of this species often have a hairy periostracum, which is grad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alcadia
''Alcadia'' is a genus of tropical and subtropical land snails with an operculum, terrestrial gastropod mollusks in the family Helicinidae. Species Species within the genus ''Alcadia'' include: * '' Alcadia affinis'' C.B. Adams, 1846 * ''Alcadia bermudezi'' Aguayo & Jaume, 1957"Mollusca" . Diversidad Biológica Cubana, accessed 23 March 2011. * '' Alcadia camagueyana'' Aguayo & Jaume, 1957 * '''' (Gundlach in Pfeiffer, 1857) * '' [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alcadia Conuloides
''Alcadia conuloides'' is a species of tropical land snail with an operculum, a terrestrial gastropod mollusk in the family Helicinidae. Taxonomy Robert John Lechmere Guppy (1895) considered this species synonymous with the taxon '' Schrammia schrammia'' (Crosse, 1872) from Guadeloupe, but that species is larger and higher-spired, and therefore Guppy's name was resurrected. Horace Burrington Baker (1927) suggested that Guppy's species probably belongs in the genus ''Alcadia'', subgenus ''Idesa''. Until the status of '' Schrammia'' and its two species can be resolved, we follow the last published work, that of Baker (1927). Distribution This species is endemic to the West Indian island of Dominica Dominica ( or ; Kalinago: ; french: Dominique; Dominican Creole French: ), officially the Commonwealth of Dominica, is an island country in the Caribbean. The capital, Roseau, is located on the western side of the island. It is geographically .... Ecology This small ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vianinae
Vianinae is a subfamily of tropical land snail, a terrestrial gastropod mollusk in the family Helicinidae. Species According to the World Register of Marine Species, the following genera are accepted within ''Vianinae'': * ''Calidviana'' H. B. Baker, 1954 * '' Calybium'' Morlet, 1892 * '' Eutrochatella'' P. Fischer, 1885 * '' Geophorus'' P. Fischer, 1885 * '' Geotrochatella'' P. Fischer, 1891 * '' Heudeia'' Crosse, 1885 * ''Lucidella'' Swainson, 1840 * ''Priotrochatella'' H. Fischer, 1893 * '' Pseudotrochatella'' G. Nevill, 1881 * '' Pyrgodomus'' Crosse &P. Fischer, 1894 * ''Semitrochatella'' Aguayo & Jaume, 1958 * '' Swiftella'' H. B. Baker, 1941 * ''Troschelviana'' H. B. Baker, 1922 * ''Ustronia ''Ustronia'' is a genus of land snails with an operculum, terrestrial gastropod mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Ar ...'' A. J. Wagner, 1908 * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emoda
''Emoda'' is a genus of land snails with an operculum, terrestrial gastropod mollusks in the family Helicinidae. Species Species within the genus ''Emoda'' include: * ''Emoda bayamensis'' (Poey, 1854)"Mollusca" . Diversidad Biológica Cubana, accessed 23 March 2011. * '''' Aguayo & Jaume, 1954 * '''' Clench & Aguayo in Aguayo, 1953 * '''' (Poey, 1851)< ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bourciera
''Bourciera'' is a genus of neotropical terrestrial gastropod mollusks or land snails in the family Helicinidae. All species in the genus have an operculum. In 1907, an attempt was made to rename the genus ''Pseudhelicina'', sometimes corrected to ''Pseudohelicina,'' on the basis of the fact that ''Bourciera'' was also the name of a genus of birds, but according to MolluscaBase this replacement was unnecessary and ''Bourciera'' is still used. H. Burrington Baker considered ''Bourciera'' among the most primitive of terrestrial mollusks. Distribution The genus was initially described from Ecuador based on specimens collected by Jules Bourcier, after whom it was named. It is also known to occur in Peru. Species Species within the genus ''Bourciera'' include: * ''Bourciera fraseri'' Pfeiffer 1859 * ''Bourciera helicinaeformis'' Pfeiffer 1853 * ''Bourciera striatula'' Miller 1879 * ''Bourciera viridissima'' Miller 1879Miller, Konrad (1879). Die Binnenmollusken von Ecuad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicinoidea
Helicinoidea is a taxonomic superfamily of land snails that have an operculum. In other words, they are terrestrial operculate gastropod mollusks. They are in the superfamily Neritoidea and are quite closely related to the marine and freshwater nerites. Taxonomy The following families are within according to the taxonomy by Bouchet & Rocroi (2005): * family Helicinidae * † family Dawsonellidae * † family Deaniridae * family Neritiliidae * family Proserpinellidae Proserpinellidae is a Taxonomy (biology), taxonomic family (biology), family of land snails with an operculum (gastropod), operculum, terrestrial animal, terrestrial gastropod mollusks in the superfamily Helicinoidea (according to the Taxonomy o ... * family Proserpinidae References Gastropod superfamilies {{Neritimorpha-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taxonomy Of The Gastropoda (Bouchet & Rocroi, 2005)
The taxonomy of the Gastropoda as it was revised in 2005 by Philippe Bouchet and Jean-Pierre Rocroi is a system for the scientific classification of gastropod mollusks. (Gastropods are a taxonomic class of animals which consists of snails and slugs of every kind, from the land, from freshwater, and from saltwater.) The paper setting out this taxonomy was published in the journal ''Malacologia''. The system encompasses both living and extinct groups, as well as some fossils whose classification as gastropods is uncertain. The Bouchet & Rocroi system was the first complete gastropod taxonomy that primarily employed the concept of clades, and was derived from research on molecular phylogenetics; in this context a clade is a "natural grouping" of organisms based upon a statistical cluster analysis. In contrast, most of the previous overall taxonomic schemes for gastropods relied on morphological features to classify these animals, and used taxon ranks such as order, superorder ... [...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] |
Land Snail
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 as slugs). However, it is not always easy to say which species are terrestrial, because some are more or less amphibious between land and fresh water, and others are relatively amphibious between land and salt water. Land snails are a polyphyletic group comprising at least ten independent evolutionary transitions to terrestrial life (the last common ancestor of all gastropods was marine). The majority of land snails are pulmonates that have a lung and breathe air. Most of the non-pulmonate land snails belong to lineages in the Caenogastropoda, and tend to have a gill and an operculum. The largest clade of land snails is the Cyclophoroidea, with more than 7,000 species. Many of these operculate land snails live in habitats or microhabitats ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilhelm August Wenz
Wilhelm August Wenz (21 October 1886 – 12 September 1945) was a German malacologist, born in Frankfurt am Main. He is the author of the 7-part Gastropoda 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. ... section of ''Handbuch der Paläozoologie'' (1938-1944), a very important review that described all known fossil genera. Only a few copies of this rare work survive: almost the entire stock of later editions was destroyed during the Second World War. Bibliography (incomplete) * Fischer K. & Wenz W. A. (1914''Die Landschneckenkalke des Mainzer Beckens und ihre Fauna'' * Wenz W. (1923-1930) "Gastropoda extramarina tertiaria" ''Fossilium catalogus, I: Animalia''. 3387 pp., published in parts. * Wenz W. (1938-1944) ''Teil 1: Allgemeiner Teil und Prosobranchia''. In: Schin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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