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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

Durangonella Morrison, 1945

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

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 include:[5]


  1. ^ a b Wesselingh F. P., et al. (2006). Molluscs from the Miocene Pebas Formation of Peruvian and Colombian Amazonia. Scripta Geologica 1333 19-290.
  2. ^ a b 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. ^ a b Bouchet, P. (2014). Tryonia Stimpson, 1865. Accessed through: World Register of Marine Species at on 2014-11-16
  4. ^ a b 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)

External links[edit]