Tryonia

Tryonia is a genus of freshwater snails in the family Hydrobiidae.[1] This genus is sometimes placed in the family Cochliopidae.[3]

For the plant genus, see Tryonia (plant).

Tryonia
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
(unranked):	clade Caenogastropoda clade Hypsogastropoda clade Littorinimorpha
Superfamily:	Truncatelloidea
Family:	Hydrobiidae[1]
Genus:	Tryonia Stimpson, 1865[2]
Type species
Tryonia clathrata Stimpson, 1865
Synonyms[3]
Durangonella Morrison, 1945

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.[4]

Most of these snails occur in western North America, especially the Chihuahuan Desert. There are also species known in Florida and Guatemala.[4]

Species

Species include:[5]

• 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
• Tryonia cheatumi – Phantom tryonia, Cheatum's snail
• Tryonia circumstriata
• Tryonia clathrata Stimpson, 1865 – grated tryonia (the type species)[2]
• Tryonia diaboli – devil tryonia
• Tryonia elata – Point of Rocks tryonia
• Tryonia ericae – minute tryonia
• Tryonia gilae – Gila tryonia
• Tryonia imitator – mimic tryonia, California brackish water snail
• Tryonia infernalis – Blue Point Tryonia[6]
• Tryonia kosteri – Koster's tryonia, Sago tryonia
• Tryonia margae – Grapevine Springs elongate tryonia
• Tryonia protea – 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

1. Wesselingh F. P., et al. (2006). Molluscs from the Miocene Pebas Formation of Peruvian and Colombian Amazonia. Scripta Geologica 1333 19-290.
2. Stimpson, W. (1865). Diagnoses of newly discovered genera of gasteropods, belonging to the sub-fam. Hydrobiinae, of the family Rissoidae. American Journal of Conchology 1 52-54. page 54.
3. 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
4. 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.
5. Tryonia. Integrated Taxonomic Information System (ITIS)
6. Hershler, Robert; Liu, Hsiu-Ping; Simpson, Jeffrey (March 2015). "Assembly of a micro-hotspot of caenogastropod endemism in the southern Nevada desert, with a description of a new species of "Tryonia" (Truncatelloidea, Cochliopidae)". ZooKeys. 492: 107–122. doi:10.3897/zookeys.492.9246. PMC 4389216. PMID 25878543.

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 7 (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.