Physella gyrina
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.
| Physella gyrina | |
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| Physella gyrina figure 10 | |
| Scientific classification | |
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| Subfamily: | Physinae |
| Tribe: | Physellini |
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| Species: | P. gyrina |
| Binomial name | |
| Physella gyrina | |
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Physa gyrina Say, 1821 | |
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.
Drawing of the eggs of Physella gyrina: upper image is the egg-mass showing position of eggs in envelope. Lower images is a single egg showing the position of an embryo.
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
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