Gyraulus crista

Gyraulus crista
Conservation status
	; Least Concern (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Heterobranchia
Superorder:	Hygrophila
Family:	Planorbidae
Genus:	Gyraulus
Subgenus:	G. (Armiger)
Species:	G. crista
Binomial name
	Gyraulus crista; (Linnaeus, 1758)
Synonyms
	Nautilus crista Linnaeus, 1758; Armiger crista (Linnaeus, 1758); Planorbis crista (Linnaeus, 1758)

Gyraulus crista, commonly called the Nautilus ramshorn, is a minute

mollusk in the family Planorbidae, the ram

's horn snails.

Subspecies

Subspecies include:

Gyraulus crista cristatus Draparnaud, 1805
Gyraulus crista nautilus Linnaeus, 1767
Gyraulus crista spinulosus Clessin

Distribution

The distribution of this species is

Holarctic

(spread across the northern part of the whole northern hemisphere). The distribution type is circumpolar wide-temperate, and the range includes:

Czech Republic^[3] - least concern (LC)^[4]
Slovakia^[3]
Germany
Italy
Netherlands^[5]
Sweden
The British Isles, Great Britain, Ireland
See Fauna Europaea for European distribution.

Shell description

The minute shell is nearly planispiral in its coiling, but the spire is actually considerably sunken rather than raised (which is usually the case with gastropods).

The shell has regular transverse ridges which form points extending beyond the main curve of the periphery of the shell.

The shell color is a translucent yellowy-brown. The maximum shell dimension is about 3 mm.

Ecology

This snail lives on water plants in clear still freshwater. In Ireland it is common in medium to very small habitats including slow streams, drains and marsh and fen pools It is occasionally found in very acid waters.

This minute species, although technically a pulmonate gastropod, does not use air for respiration but instead absorbs oxygen through its mantle cavity which is full of water.

References

^ Killeen I., Van Damme D. & Seddon M. B. (2011). "Gyraulus crista". The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 09 March 2015.
^ 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).
^ ^a ^b (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, Suppl. 1: 1-37. PDF.
^ Juřičková L., Horsák M. & Beran L., 2001: Check-list of the molluscs (Mollusca) of the Czech Republic. Acta Soc. Zool. Bohem., 65: 25-40.
^ "Anemoon > Flora en Fauna > Soorteninformatie". www.anemoon.org.

External links

Gyraulus crista at AnimalBase

[1] Killeen I., Van Damme D. & Seddon M. B. (2011). "Gyraulus crista". The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 09 March 2015.

[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).

[Horsák_2010-3] (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, Suppl. 1: 1-37. PDF.

[4] Juřičková L., Horsák M. & Beran L., 2001: Check-list of the molluscs (Mollusca) of the Czech Republic. Acta Soc. Zool. Bohem., 65: 25-40.

[5] "Anemoon > Flora en Fauna > Soorteninformatie". www.anemoon.org.

[1]

[2]

[3]

[4]

[5]