# Anisus vortex

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***Anisus vortex*** is a [species](/source/Species) of small [freshwater snail](/source/Freshwater_snail), an [aquatic](/source/Aquatic_animal) [gastropod](/source/Gastropod) [mollusk](/source/Mollusk) in the family [Planorbidae](/source/Planorbidae), the ram's horn snails and their allies.[2]

## Description

The shell is only 0.8 to 1.1 mm high and measures up to 9 mm in diameter. It has up to 7 whorls. The shell is flattened at the functional lower side, concave at the upper side. On the top, the whorls are flat, separated only by a slightly pronounced seam. On the bottom, however, the whorls are more curved and separated by a distinct suture. Shell with very sharp keel.

## Distribution

The range of this species is from Europe across the [Palearctic](/source/Palearctic) to Siberia. It occurs in countries and islands including:

- Belgium
- [Czech Republic](/source/List_of_non-marine_molluscs_of_the_Czech_Republic)[3] - least concern (LC)[4]
- [Germany](/source/List_of_molluscs_recorded_in_Germany)[5]
- [Great Britain](/source/List_of_non-marine_molluscs_of_Great_Britain)
- [Ireland](/source/List_of_non-marine_molluscs_of_Ireland)
- [The Netherlands](/source/List_of_molluscs_recorded_in_the_Netherlands)
- [Poland](/source/List_of_molluscs_recorded_in_Poland)
- [Slovakia](/source/List_of_non-marine_molluscs_of_Slovakia)[3]

## References

1. Linnaeus, C. 1758. *[Systema Naturae](/source/Systema_Naturae) per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis*. 10th edition. - Vermes. Testacea: 700-781. Holmiae. (Salvius).

1. Bouchet, P. (2014). Anisus vortex (Linnaeus, 1758). Accessed through: World Register of Marine Species at [http://www.marinespecies.org/aphia.php?p=taxdetails&id=716345](http://www.marinespecies.org/aphia.php?p=taxdetails&id=716345) on 2014-11-24

1. (in Czech) Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovenské republiky. [Annotated list of mollusc species recorded outdoors in the Czech and Slovak Republics]". *[Malacologica Bohemoslovaca](/source/Malacologica_Bohemoslovaca)*, Suppl. 1: 1-37. [PDF](http://mollusca.sav.sk/pdf/9/Suppl-1-v2.pdf).

1. Juřičková L., Horsák M. & Beran L. (2001). "Check-list of the molluscs (Mollusca) of the Czech Republic". *[Acta Soc. Zool. Bohem.](/source/Acta_Soc._Zool._Bohem.)* **65**: 25-40.

1. (in German) Glöer P. & Meier-Brook C. (2003). *Süsswassermollusken*. DJN, pp. 134, ISBN 3-923376-02-2

## External links

- [*Anisus vortex*](http://www.animalbase.uni-goettingen.de/zooweb/servlet/AnimalBase/home/species?id=1877) at [Animalbase](/source/Animalbase)

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Adapted from the Wikipedia article [Anisus vortex](https://en.wikipedia.org/wiki/Anisus_vortex) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Anisus_vortex?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.