Anisus vorticulus
Anisus vorticulus | |
---|---|
Shells of Anisus vorticulus | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Subclass: | Heterobranchia |
Superorder: | Hygrophila |
Family: | Planorbidae |
Genus: | Anisus |
Species: | A. vorticulus
|
Binomial name | |
Anisus vorticulus |
Anisus vorticulus (lesser ramshorn snail or little whirlpool ramshorn snail) is a species of minute, air-breathing,
Description
The lesser ramshorn snail is a very small species growing to a maximum diameter of 5 mm (0.2 in). The shell lacks a keel and the peripheral angle is relatively prominent, with a slender, narrow periostracal fringe.[3]
Distribution
Anisus vorticulus occurs in
In the British Isles, this species is restricted to a small number of sites in the Norfolk Broads and the
Habitat
This small snail lives in pools with standing water and in oxbow lakes, but these biotopes are threatened because of sedimentation and ecological succession. It favours ditches with much aquatic flora but little emergent vegetation. Invasive plants such as floating marsh pennywort, (Hydrocotyle ranunculouides), that sometimes chokes ditches, and the Himalayan balsam (Impatiens glandulifera) are particularly harmful.[1]
This species often lives in places where there is abundant duckweed Lemna spp.[13] Water quality that is suitable for Anisus vorticulus is water without turbidity, with a high pH and a low level of nutrients.[1][13] The main threats to this snail include land drainage, poor habitat management and eutrophication.[13]
References
- ^ a b c d e Van Damme D. (2012). "Anisus vorticulus". The IUCN Red List of Threatened Species. Version 2014.3. >www.iucnredlist.org<. Downloaded on 22 February 2015.
- ^ Troschel F. H. (1834). De limnaeaceis seu de gasteropodis pulmonatis quae nostris in aquis vivunt. pp. [1-5], 1-65, [1]. Berolini. page 51.
- ISBN 978-0-12-385024-9.
- ^ ISSN 1336-6939.
- ^ Juřičková L., Horsák M. & Beran L. (2001) "Check-list of the molluscs (Mollusca) of the Czech Republic". Acta Societatis Zoologicae Bohemicae 65: 25-40.
- ^ (in Czech) Dušek J., Hošek M. & Kolářová J. (2007) "Hodnotící zpráva o stavu z hlediska ochrany evropsky významných druhů a typů přírodních stanovišť v České republice za rok 2004-2006". Ochrana přírody 62(5): appendix 5:I-IV.
- ^ UK Biodiversity Action Plan "Species Action Plan". Archived from the original on 2007-06-25. Retrieved 2007-03-05.
- ^ "Little Whirlpool Ramshorn Snail". Back from the Brink. Retrieved 16 August 2018.
- ISBN 3-923376-02-2.
- ^ "Anemoon > Flora en Fauna > Soorteninformatie". www.anemoon.org (in Dutch).
- ISSN 1336-6939.
- ISSN 1336-6939.
- ^ a b c d "Lesser whirlpool ram's-horn snail: Anisus vorticulus". JNCC. Retrieved 15 March 2020.
External links
- Anisus vorticulus at Animalbase
- distribution of Anisus vorticulus at European Environment Agency webpage
- (in Czech) Anisus vorticulus and its distribution in the Czech Republic with map