Menetus dilatatus
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| Menetus dilatatus | |
|---|---|
 | |
| Menetus dilatatus (Gould, 1841) | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Superorder: | Hygrophila |
| Family: | Planorbidae |
| Genus: | Menetus |
| Species: | M. dilatatus |
| Binomial name | |
| Menetus dilatatus | |
| Synonyms | |
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Menetus dilatatus is a species of small air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails.
The shell is small, of a yellowish green-color, minutely wrinkled by the lines of growth. The spire is flat,[1] composed of 2.5-3 whorls,[2] separated by a well-defined suture. The outer whorl has a sharp margin on a level with the spire, diminishing near, but still modifying, the aperture. Below this line the whorl is very convexly rounded so as to encircle a small, deep, abruptly formed umbilicus. This whorl rapidly enlarges, and terminates in a very large, not very oblique aperture, with the lip expanded so as to make it trumpet-shaped.[1]
The width of the shell is 2–3 mm.[2] The height of the shell is 0.9 mm.[2]
Distribution
The species is native to North America. The type locality is Nantucket island and Hingham, Massachusetts, USA.[1]
Its non-native distribution includes:
- Czech Republic - non-indigenous, in Bohemia around Elber river[3] and in Southern Bohemia[4][5]
- Germany
- Netherlands
- Poland
- Great Britain