Thickshell pondsnail
| Thickshell pondsnail | |
|---|---|
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| Drawing of apertural view of the shell of Stagnicola utahensis. | |
| Conservation status | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| (unranked): | clade Heterobranchia clade Euthyneura clade Panpulmonata clade Hygrophila |
| Superfamily: | Lymnaeoidea |
| Family: | Lymnaeidae |
| Subfamily: | Lymnaeinae |
| Genus: | Stagnicola |
| Species: | S. utahensis |
| Binomial name | |
| Stagnicola utahensis (Call, 1884)[2] |
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| Synonyms | |
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Radix ampla var. utahensis Call, 1884 |
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Stagnicola utahensis, common name the thickshell pondsnail, is a species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Lymnaeidae, the pond snails.
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[edit] Shell description
The shell is globose, somewhat umbilicated and irregularly costate. The color of the shell is light horn and nearly pellucid. The spire is rather small and conical. The shell has from 4 to 4 and half convex whorls, that are somewhat flattened above, giving rather a shouldered appearance to the whorls. Whorls are rapidly increasing in size. The last whorl is inflated, with numerous rather marked transverse costae and minutely wrinkled. The suture is somewhat deep, regularly impressed.[3]
The aperture is elongately ovate, effuse, approaching patulous and pearly white within. The outer lip is simple and its margin is connected by a slight calcareous deposit. The columella is somewhat twisted, but straight in front.[3]
The average width of the shell of Stagnicola utahensis is 7.10 mm. The average height of the shell is 13.40 mm. The maximum width of the shell is 8.88 mm. The height of the shell is 16.82 mm. The width of the aperture is 5.90 mm. The height of the aperure is 9.00 mm.[3]
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Drawing of apical view of the shell
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Drawing of lateral view of the shell
[edit] Anatomy
The anatomy of the radula was not published.[3] (cf. [4])
[edit] Distribution
This species is endemic to the United States and it is known only from Utah Lake. The type locality is Lake Utah, Lehi, Utah.[3]
The species was "rare" in the lake Utah in 1880s already.[3]
The last living examples are reported from early 1930s.[4]
[edit] Ecology
It was associated with abundant specimens of the snails Valvata utahensis and Fluminicola fusca and with bivalve Sphaerium dentatum.[3]
[edit] References
This article incorporates public domain text from reference [3]
- ^ Mollusc Specialist Group (1996). Stagnicola utahensis. 2006 IUCN Red List of Threatened Species. Downloaded on 7 August 2007.
- ^ Call R. E. (1884). Bull. U. S. Geol. Sur. 11: p. 47, plate VI., figures 7-9.
- ^ a b c d e f g h Call R. E. (1886). "On certain recent, quarternary, and new fresh-water Mollusca". Proceeding Davenport Academy of Natural Sciences 5: page 5, plate I, figure 7-9.
- ^ a b THICKSHELL PONDSNAIL. Utah Division of Wildlife Resources, accessed 21 July 2009.
[edit] External links
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