''Tryonia'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

freshwater snail Freshwater snails are gastropod mollusks which live in fresh water. There are many different families. They are found throughout the world in various habitats, ranging from ephemeral pools to the largest lakes, and from small seeps and springs ...

s in the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Hydrobiidae Hydrobiidae, commonly known as mud snails, is a large cosmopolitan family of very small freshwater and brackish water snails with an operculum; they are in the order Littorinimorpha. Distribution Hydrobiidae are found in much of the world, ...

.Wesselingh F. P., et al. (2006).
Molluscs from the Miocene Pebas Formation of Peruvian and Colombian Amazonia.
''

Scripta Geologica ''Scripta Geologica'' is a peer-reviewed scientific journal that publishes on vertebrate and invertebrate palaeontology, palaeobotany/palynology, stratigraphy, petrology, and mineralogy, including gemmology with a focus on systematics. It is publis ...

'' 1333 19-290. This genus is sometimes placed in the family

Cochliopidae Cochliopidae is a family of small freshwater snails with gills and an operculum, aquatic gastropod mollusks. Paludestrina d'Orbigny, 1840 is an archaic synonym, and has been placed on the Official Index of Rejected and Invalid Names by ICZN ...

Bouchet, P. (2014). Tryonia Stimpson, 1865. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=722774 on 2014-11-16 Snails of this genus are very small with narrow shells. Females brood young within the genital tract. Species usually live in springs. The genus is differentiated from others by the structure of the male and female reproductive systems.Hershler, R., et al. (2011)
New species and records of springsnails (Caenogastropoda: Cochliopidae: Tryonia) from the Chihuahuan Desert (Mexico and United States), an imperiled biodiversity hotspot.
''Zootaxa'' 3001 1-32. Most of these snails occur in western North America, especially the

Chihuahuan Desert The Chihuahuan Desert ( es, Desierto de Chihuahua, ) is a desert ecoregion designation covering parts of northern Mexico and the southwestern United States. It occupies much of far West Texas, the middle to lower Rio Grande Valley and the lower P ...

. There are also species known in

Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, and to ...

and

Guatemala Guatemala ( ; ), officially the Republic of Guatemala ( es, República de Guatemala, links=no), is a country in Central America. It is bordered to the north and west by Mexico; to the northeast by Belize and the Caribbean; to the east by H ...

Species

Species include: * '' Tryonia adamantina'' – Diamond Y springsnail, Diamond tryonia * '' Tryonia aequicostata'' – smooth-rib hydrobe * '' Tryonia alamosae'' – Alamosa springsnail, Caliente tryonia * '' Tryonia angulata'' – Sportinggoods tryonia * '' Tryonia brevissima'' – regal hydrobe * ''

Tryonia brunei Brune's tryonia (also known as Brune's Springsnail and Brune Spring Snail), scientific name ''Tryonia brunei'', is a species of very small freshwater snail that has a gill and an operculum, an aquatic gastropod mollusks in the family Hydrobiid ...

'' – Brune's tryonia * '' Tryonia cheatumi'' – Phantom tryonia, Cheatum's snail * '' Tryonia circumstriata'' * '' Tryonia clathrata'' Stimpson, 1865 – grated tryonia (the

type species In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specimen ...

) * ''

Tryonia diaboli ''Tryonia'' is a genus of freshwater snails in the family Hydrobiidae.Wesselingh F. P., et al. (2006).Molluscs from the Miocene Pebas Formation of Peruvian and Colombian Amazonia.''Scripta Geologica'' 1333 19-290. This genus is sometimes placed ...

'' – devil tryonia * ''

Tryonia elata The Point of Rocks tryonia, scientific name ''Tryonia elata'', is a species of freshwater snail, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to the United States. The common name of the species refers to the a ...

'' – Point of Rocks tryonia * ''

Tryonia ericae The minute tryonia scientific name ''Tryonia ericae'', is a species of very small or minute freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to the United States ...

'' – minute tryonia * ''

Tryonia gilae The Gila tryonia (''Tryonia gilae'') is a species of freshwater snail in the family Hydrobiidae, the mud snails. It is endemic to Arizona in the United States, where it is known only from Graham County.NatureServe. 2014''Tryonia gilae''.NatureSe ...

'' – Gila tryonia * ''

Tryonia imitator The California brackish water snail, also known as the mimic tryonia, scientific name ''Tryonia imitator'', is a species of very small brackish water snails that have an operculum, aquatic gastropod mollusks in the family Hydrobiidae. This spe ...

'' – mimic tryonia, California brackish water snail * ''

Tryonia infernalis ''Tryonia'' is a genus of freshwater snails in the family Hydrobiidae.Wesselingh F. P., et al. (2006).Molluscs from the Miocene Pebas Formation of Peruvian and Colombian Amazonia.''Scripta Geologica'' 1333 19-290. This genus is sometimes placed ...

'' – Blue Point Tryonia * ''

Tryonia kosteri Koster's tryonia, scientific name ''Tryonia kosteri'', is a species of small freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. Distribution This species is endemic to New Mexico in the Unit ...

'' – Koster's tryonia, Sago tryonia * ''

Tryonia margae ''Tryonia'' is a genus of freshwater snails in the family Hydrobiidae.Wesselingh F. P., et al. (2006).Molluscs from the Miocene Pebas Formation of Peruvian and Colombian Amazonia.''Scripta Geologica'' 1333 19-290. This genus is sometimes placed ...

'' – Grapevine Springs elongate tryonia * ''

Tryonia protea ''Tryonia'' is a genus of freshwater snails in the family Hydrobiidae.Wesselingh F. P., et al. (2006).Molluscs from the Miocene Pebas Formation of Peruvian and Colombian Amazonia.''Scripta Geologica'' 1333 19-290. This genus is sometimes placed ...

'' – desert tryonia * '' Tryonia quitobaquitae'' – Quitabaquito tryonia * '' Tryonia robusta'' – robust tryonia * '' Tryonia rowlandsi'' – Grapevine Springs squat tryonia * '' Tryonia salina'' – Cottonball Marsh tryonia * '' Tryonia seemani'' (Frauenfeld, 1863) * '' Tryonia variegata'' – Amargosa tryonia

References

External links

* Myers, P., et al. 2014
''Tryonia''.
The Animal Diversity Web. * Hershler, R. (1999)
A systematic review of the hydrobiid snails (Gastropoda: Rissoidea) of the Great Basin, western United States. Part II. Genera ''Colligyrus'', ''Fluminicola'', ''Pristinicola'', and ''Tryonia''".
''The Veliger'' 42(4) 306-37. * Hershler, R. & F. G. Thompson. (1987)
North American Hydrobiidae (Gastropoda: Rissoacea): redescription and the systematic relationships of ''Tryonia'' Stimpson, 1865 and ''Pyrgulopsis'' Call and Pilsbry, 1886.
'' The Nautilus'' 101(1) 25-32. * Stimpson, W. (1865). Researches upon the Hydrobiinae and allied forms chiefly made upon materials in the museum of the Smithsonian Institution. '' Smithsonian Miscellaneous Collections''
(201)
1-59
page 48
* Thompson F.G. (2011) ''An annotated checklist and bibliography of the land and freshwater snails of México and central America''. Florida Museum of Natural History, Bulletin 50(1): 1-299. Cochliopidae Taxa named by William Stimpson {{Cochliopidae-stub