''Georissa'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of minute

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 molluscs, terrestrial gastropod mollusks that have gastropod shell, shel ...

terrestrial Terrestrial refers to things related to land or the planet Earth, as opposed to extraterrestrial. Terrestrial may also refer to: * Terrestrial animal, an animal that lives on land opposed to living in water, or sometimes an animal that lives on o ...

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

mollusk Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The ...

s in the family

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 ...

.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 species, '' Georissa filiasaulae'', is cavernicolous. It is only known from two caves in the Sepulut area of Sabah, Malaysian Borneo, where its above-ground sister species, ''

Georissa saulae ''Georissa saulae'' is a species of a minute land snail that have an operculum, a terrestrial gastropod mollusk in the family Hydrocenidae. Distribution This species lives in Sabah, Malaysian Borneo.Schilthuizen M., Rutten E. J. M. & Haase M ...

'', inhabits the rocks outside of the cave, and is connected to the cave snail via narrow zones of hybridization at the cave entrances. Possibly, ''G. filiasaulae'' has evolved without ever having been fully separated from its ancestor, a process known as speciation-with-gene-flow.

Species

Species within the genus ''Georissa'' include: *''

Georissa anyiensis ''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.m ...

'' Khalik, Hendriks, Vermeulen & Schilthuizen, 2018 * '' Georissa bangueyensis'' E. A. Smith, 1895 *'' Georissa bauensis'' Khalik, Hendriks, Vermeulen & Schilthuizen, 2018 * '' Georissa biangulata'' Quadras & Möllendorff, 1894 * ''

Georissa borneensis ''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.m ...

'' E. A. Smith, 1895 * ''

Georissa elegans ''Georissa elegans'' is a species of small cave snails, gastropod mollusks in the family Hydrocenidae of gastropod in the Hydrocenidae family. Distribution The species is endemic to Guam Guam ( ; ) is an island that is an Territories of ...

'' Quadras & Möllendorff, 1894 * ''

Georissa everetti ''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.m ...

'' E. A. Smith, 1895 * '' Georissa filiasaulae'' Haase & Schilthuizen, 2007Haase M. & Schilthuizen M. (2007). "A new ''Georissa'' (Gastropoda: Neritopsina: Hydrocenidae) from a limestone cave in Malaysian Borneo". ''Journal of Molluscan Studies'' 73(3): 215-221. . * ''

Georissa gomantongensis ''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.m ...

'' E.A. Smith, 1894 * ''

Georissa hadra ''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.m ...

'' Thompson & Dance, 1983 * ''

Georissa hosei ''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.m ...

'' Godwin-Austen, 1889 * ''

Georissa japonica ''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.m ...

'' Pilsbry, 1900Noseworthy R. G., Lim N.-R. & Choi K.-S. (2007). "A Catalogue of the Mollusks of

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Georissa kinabatanganensis ''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.m ...

'' Khalik, Hendriks, Vermeulen & Schilthuizen, 2018 * '' Georissa kobelti'' Gredler, 1902 * '' Georissa laevigata'' Quadras & Möllendorff, 1894 * '' Georissa laseroni'' (Iredale, 1937) * Georissa mawsmaiensis Das & Aravind, 2021 * '' Georissa monterosatiana'' Godwin-Austen & Neville, 1879 *'' Georissa muluensis'' Khalik, Hendriks, Vermeulen & Schilthuizen, 2018 * '' Georissa niahensis'' Godwin-Austen, 1889 * '' Georissa pachysoma'' Vermeulen & Junau, 2007 * '' Georissa purchasi'' * '' Georissa pyrrhoderma'' Thompson & Dance 1983 * '' Georissa pyxis'' (Benson, 1856) - type species of the genus ''Georissa'' * '' Georissa rufula'' von Möllendorf, 1900 * ''

'' (van Benthem-Jutting, 1966) * '' Georissa scalinella'' (van Benthem-Jutting, 1966) * '' Georissa semisculpta'' *'' Georissa sepulutensis'' Khalik, Hendriks, Vermeulen & Schilthuizen, 2018 * ''

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.m ...

'' Amano, 1939 * '' Georissa silaburensis'' Khalik, Hendriks, Vermeulen & Schilthuizen, 2018 * '' Georissa similis'' E.A. Smith, 1894 * '' Georissa vesta'' Thompson & Dance, 1983 * '' Georissa williamsi'' Godwin-Austen, 1889 (including ''Georissa hungerfordi'')

References

External links

* {{Taxonbar, from=Q5548513 Gastropod genera Hydrocenidae Gastropods of Asia Molluscs of Oceania Taxonomy articles created by Polbot