Physella gyrina

Physella gyrina
	Physella gyrina figure 10
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
(unranked):	clade Heterobranchia; clade Euthyneura; clade Panpulmonata; clade Hygrophila
Superfamily:	Planorboidea
Family:	Physidae
Subfamily:	Physinae
Tribe:	Physellini
Genus:	Physella
Species:	P. gyrina
Binomial name
	Physella gyrina; (Say, 1821)
Synonyms
	Physa gyrina Say, 1821

Physella gyrina, common name the "tadpole physa", is a species of small, left-handed or sinistral, air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Physidae.

Shell description

Snails in the family Physidae have shells that are sinistral, which means that if the shell is held with the spire pointing up, and the aperture is facing the observer, the aperture is on the left-hand side.

The shells of Physella species have a long and large aperture, a pointed spire, and no operculum. The shells are thin and corneous and rather transparent.

Distribution

This species is known to occur in:

the USA - indigenous
Great Britain - introduced
Ireland - introduced
Spain

References

^ Say, T. (1821). "Descriptions of univalve shells of the United States". Journal of the Academy of Natural Sciences of Philadelphia 2(1): 149-179.

External links

Physella gyrina at Animalbase taxonomy,short description, distribution, biology,status (threats), images
ITIS info: [1]

[1] Say, T. (1821). "Descriptions of univalve shells of the United States". Journal of the Academy of Natural Sciences of Philadelphia 2(1): 149-179.

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