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Hydrocenidae
Hydrocenidae is a taxonomic family of minute land snails or cave snails with an operculum, terrestrial gastropod mollusks or micromollusks in the clade Cycloneritimorpha. Hydrocenidae are widespread across the Palearctis and Africa, but reach their highest diversity in the Oriental, Australian, and Oceanian regions. The family is poorly known and has not been revised in the past 140 years and as a consequence, the status of the various genus names (including '' Georissa'') is uncertain. Hydrocenidae is the only family in the superfamily Hydrocenoidea. This family has no subfamilies according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005. Description The animal have no gill, but a pulmonary cavity. Tentacles are short and large. The eyes are prominent, situated at the upper or outer base of the tentacles. The foot is short, oval and obtuse. The denticle (tiny teeth) of radula have the formula ∞ 1, (1 + 1 + 1), 1 ∞. The central denticles are small and elon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Georissa
''Georissa'' is a genus of minute land snails, terrestrial gastropod mollusks in the family Hydrocenidae.MolluscaBase eds. (2025). MolluscaBase. Georissa W. T. Blanford, 1864. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=818273 on 2025-04-21 Description (Original description in Latin) The shell is imperforate or scarcely perforate. It is very small, and conical, displaying an amber-colored or reddish hue. It is usually spirally grooved or striated. The operculum appears semi-oval, lacking any trace of spiral structure, and presents eccentric striations. It is testaceous (shell-like) and transparent. The animal is small and is equipped with hemispherical lobes in place of tentacles. Its eyes are normal, and its foot is short and rounded. Distribution Although the species are best known for living on the surface of limestone rocks, they are often also found in and on the vegetation and on non-calcareous rocks. One ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Georissa Shikokuensis
''Georissa'' is a genus of minute land snails, terrestrial gastropod mollusks in the family Hydrocenidae.MolluscaBase eds. (2025). MolluscaBase. Georissa W. T. Blanford, 1864. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=818273 on 2025-04-21 Description (Original description in Latin) The shell is imperforate or scarcely perforate. It is very small, and conical, displaying an amber-colored or reddish hue. It is usually spirally grooved or striated. The operculum appears semi-oval, lacking any trace of spiral structure, and presents eccentric striations. It is testaceous (shell-like) and transparent. The animal is small and is equipped with hemispherical lobes in place of tentacles. Its eyes are normal, and its foot is short and rounded. Distribution Although the species are best known for living on the surface of limestone rocks, they are often also found in and on the vegetation and on non-calcareous rocks. O ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monterissa Gowerensis
''Monterissa gowerensis'', also known as the Lord Howe microturban, is a species of small cave snails with an operculum, gastropod mollusks in the family Hydrocenidae. Description The globosely turbinate shell of adult snails is 2.1–2.4 mm in height, with a diameter of 1.7–2 mm, with deeply impressed sutures. It is smooth, glossy and pale golden-brown in colour. The umbilicus is closed. The ovately lunate aperture has an operculum. Distribution and habitat This terrestrial and freshwater species occurs on Australia's Lord Howe Island in the Tasman Sea, where it is rare and found mainly on the slopes of Mount Gower and Mount Lidgbird Mount Lidgbird, also Mount Ledgbird and Big Hill, is located in the southern section of Lord Howe Island, just north of Mount Gower, from which it is separated by the saddle at the head of Erskine Valley, and has its peak at above sea level. ... in leaf litter and cliff crevices. References Hydrocenidae Gastropods of L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monterissa
''Monterissa'' is a genus of minute cave snails with an operculum, gastropod mollusks in the family Hydrocenidae. Species Species within the genus ''Monterissa'' include: * ''Monterissa gowerensis ''Monterissa gowerensis'', also known as the Lord Howe microturban, is a species of small cave snails with an operculum, gastropod mollusks in the family Hydrocenidae. Description The globosely turbinate shell of adult snails is 2.1–2.4 ...'' References Australian Faunal Directory info* Iredale, T. 1944. ''The land Mollusca of Lord Howe Island.'' The Australian Zoologist 10: 299-334 Hydrocenidae Taxonomy articles created by Polbot Monotypic gastropod genera Taxa named by Tom Iredale {{Neritimorpha-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Omphalorissa Purchasi
''Georissa purchasi'' is a species of small land snail, a terrestrial gastropod mollusc in the family Hydrocenidae. The type specimen is stored in the Imperial Natural History Museum, Vienna. Description The shell is minute, globosely conical, translucid, imperforate (no umbilicus. The sculpture consists of very fine growth-striae only. The colour is horny-fuscous. The epidermis is thin and shiny. The spire is conical, and rather obtuse. The protoconch is minute, strongly convex, smooth. The shell has 4-5 convex whorls. The last whorl is slightly greater than one-third of the height of the shell. The base is convex. The suture is impressed. The aperture is a little oblique, subcircular. The peristome is simple, straight. The columella is slightly concave, white. The inner lip is spread over the umbilicus, sealing it up more or less completely. The callus on the penultimate whorl unites the margins, and is conspicuous. The width of the shell is 1 mm. The height of the she ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrocena Praecursor
''Hydrocena'' is a genus of gastropods belonging to the family Hydrocenidae. The genus has almost cosmopolitan distribution. Species: *'' Hydrocena atavina'' *'' Hydrocena bridgesi'' *''Hydrocena cattaroensis'' *'' Hydrocena cerea'' *'' Hydrocena cornea'' *'' Hydrocena diaphana'' *'' Hydrocena dubiosa'' *'' Hydrocena dubrueiliana'' *'' Hydrocena exserta'' *'' Hydrocena gutta'' *'' Hydrocena japonica'' *'' Hydrocena kenyana'' *''Hydrocena lirata'' *'' Hydrocena moncuccoensis'' *'' Hydrocena navigatorum'' *'' Hydrocena noticola'' *'' Hydrocena obtusa'' *'' Hydrocena praecursor'' *''Hydrocena puisseguri'' *''Hydrocena pyramis'' *''Hydrocena rara'' *''Hydrocena solidula'' *''Hydrocena spiralis'' *''Hydrocena tanzaniensis'' *''Hydrocena trolli ''Hydrocena'' is a genus of gastropods belonging to the family Hydrocenidae. The genus has almost cosmopolitan distribution. Species: *'' Hydrocena atavina'' *'' Hydrocena bridgesi'' *''Hydrocena cattaroensis'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrocena Cattaroense
''Hydrocena'' is a genus of gastropods belonging to the family Hydrocenidae. The genus has almost cosmopolitan distribution. Species: *''Hydrocena atavina'' *'' Hydrocena bridgesi'' *''Hydrocena cattaroensis'' *''Hydrocena cerea'' *'' Hydrocena cornea'' *'' Hydrocena diaphana'' *'' Hydrocena dubiosa'' *'' Hydrocena dubrueiliana'' *'' Hydrocena exserta'' *'' Hydrocena gutta'' *'' Hydrocena japonica'' *'' Hydrocena kenyana'' *''Hydrocena lirata'' *'' Hydrocena moncuccoensis'' *'' Hydrocena navigatorum'' *''Hydrocena noticola'' *''Hydrocena obtusa'' *''Hydrocena praecursor'' *''Hydrocena puisseguri'' *''Hydrocena pyramis'' *''Hydrocena rara'' *''Hydrocena solidula'' *''Hydrocena spiralis'' *''Hydrocena tanzaniensis'' *''Hydrocena trolli ''Hydrocena'' is a genus of gastropods belonging to the family Hydrocenidae. The genus has almost cosmopolitan distribution. Species: *'' Hydrocena atavina'' *'' Hydrocena bridgesi'' *''Hydrocena cattaroensis'' *'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cycloneritimorpha
Cycloneritida (nerites and false-limpets) is an order of land snails, freshwater snails, and sea snails.MolluscaBase eds. (2020). MolluscaBase. Cycloneritida. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=1054475 on 2020-08-21 These are gastropod molluscs within the subclass Neritimorpha. 14 of the families in the order are extant, and eight of the families are extinct. It was previously categorized as the clade Cycloneritimorpha. According to the Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005), as well as the Cycloneritida, the subclass Neritimorpha also contains the (entirely fossil) clade Cyrtoneritimorpha, plus a number of other fossil families that are currently unassigned. The earliest evolutionary forms of Cycloneritimorpha show double visceral organs, double gills, and normally a double-chambered heart. Taxonomy The taxonomy of Cycloneritida is based on work by Kano et al. (2002) that recognizes 4 ... [...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] |
Family (biology)
Family (, : ) is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as the "walnut family". The delineation of what constitutes a family—or whether a described family should be acknowledged—is established and decided upon by active taxonomists. There are not strict regulations for outlining or acknowledging a family, yet in the realm of plants, these classifications often rely on both the vegetative and reproductive characteristics of plant species. Taxonomists frequently hold varying perspectives on these descriptions, leading to a lack of widespread consensus within the scientific community ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
