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Theodoxus fluviatilis

Theodoxus fluviatilis (*)

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Gastropoda
Subclassis: Orthogastropoda
Superordo: Neritopsina
Ordo: Neritoida
Superfamilia: Neritoidea
Familia: Neritidae
Subfamilia: Neritinae
Tribus: Theodoxini
Genus: Theodoxus
Species: Theodoxus fluviatilis


Theodoxus fluviatilis (Linnaeus, 1758)


* Theodoxus fluviatilis Report on ITIS

Vernacular names
English: River Nerite
Suomi: Leväkotilo

Theodoxus fluviatilis, common name the river nerite, is a small species of freshwater and brackish water snail with a gill and an operculum. It is an aquatic gastropod mollusk in the family Neritidae, the nerites.


This small nerite is mostly found in calcium-rich, clean, fast-moving fresh water, but it can also tolerate low-salinity brackish water.

Shell description

The shell is ovoid and only about 11 mm (less than half an inch) in maximum dimension.[3] The shell surface is whitish with fine, rather variable, darker markings.


Distribution of this species is European.[4] It is also found in North Africa.

* Austria - non-indigenous, Danube near Tulln, Lower Austria, since 2001[5]
* Croatia[6]
* Czech Republic - extinct in Bohemia[7]
* Germany - high endangered (Stark gefährdet)[8]
* Netherlands[9]
* Poland
* Slovakia[10]
* Great Britain


1. ^ 2006 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Cited 14 June 2007.
2. ^ Linnaeus, C. 1758. Systema Naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. 10th edition. - Vermes. Testacea: 700-781. Holmiae. (Salvius).
3. ^ Horst Janus. 1965. The young specialist looks at land and freshwater molluscs. Burke, London.
4. ^ (in Slovak) Lisický M. J. 1991. Mollusca Slovenska [The Slovak molluscs]. VEDA vydavateľstvo Slovenskej akadémie vied, Bratislava, 344 pp.
5. ^ (German) Schultz H. & Schultz O. (2001). "Erstnachweis der Gemeinen Kahnschnecke, Theodoxus fluviatilis (LINNAEUS, 1758) in Österreich (Gastropoda: Neritidae)". Annalen des Naturhistorischen Museums in Wien 103B: 231-241. PDF.
6. ^ Beran L. (2009). "The first record of Anisus vorticulus (Troschel, 1834) (Gastropoda: Planorbidae) in Croatia?". Malacologica Bohemoslovaca 8: 70. PDF.
7. ^ Red List of the molluscs (Mollusca) of the Czech Republic
8. ^ Glöer P. & Meier-Brook C. (2003) Süsswassermollusken. DJN, pp. 134, page 109, ISBN 3-923376-02-2
9. ^ http://www.anemoon.org/anm/voorlopige-kaarten/kaarten-per-soort/zoetwatermollusken/wetenschappelijk/theodoxus-fluviatilis/, accessed 25 September 2008
10. ^ Čejka, Tomáš; Michal Horsák (2002). "First records of Theodoxus fluviatilis and Sphaerium solidum (Mollusca) from Slovakia" (in English). Biologia, Bratislava 57 (5): 561–562.

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Source: Wikipedia, Wikispecies: All text is available under the terms of the GNU Free Documentation License