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''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 in the family Cochliopidae. 〔 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. There are also species known in Florida and Guatemala.〔 ==Species== Species include:〔(''Tryonia''. ) Integrated Taxonomic Information System (ITIS)〕 * ''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)〔 * ''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 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 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tryonia」の詳細全文を読む スポンサード リンク
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