Marstonia scalariformis
| Marstonia scalariformis | |
|---|---|
 | |
| Drawing of apertural view of the shell of Marstonia scalariformis. | |
| NE[1] | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| (unranked): | clade Caenogastropoda clade Hypsogastropoda |
| Superfamily: | Rissooidea |
| Family: | Hydrobiidae |
| Subfamily: | Nymphophilinae |
| Genus: | Marstonia |
| Species: | M. scalariformis |
| Binomial name | |
| Marstonia scalariformis (Wolf, 1869)[2] | |
| Synonyms | |
|
Pyrgula scalariformis Wolf, 1869 | |
Marstonia scalariformis, previously known as Pyrgulopsis scalariformis, common name the moss pyrg, is a species of freshwater snail with a gill and an operculum, aquatic gastropod mollusk in the family Hydrobiidae.
Shell description
The shell is turreted, slender. The shell has 6 whorls. The shell is chalky white in color. The suture is deeply impressed. The shell is carinate in its entire length on the lower edge of the whorls.[3]
The aperture is small, ovate, but slightly connected with the last whorl.[3]
The height of the shell is 12.7 mm (½ inch).[3]
Anatomy
The body of the animal is white.[4]
Distribution
Distribution of Marstonia scalariformis include Illinois,[5] Alabama,[6] Iowa and Missouri.[7]
This species was abundant on its type locality on the Tazewell shore of the Illinois River in 1880s.[3]
Conservation
This species is critically imperiled.[7]
References
This article incorporates public domain text from reference.[3]
- ↑ IUCN 2009. IUCN Red List of Threatened Species. Version 2009.1. <www.iucnredlist.org>. Downloaded on 24 July 2009.
- ↑ Wolf (1869). Am. Jour. Conch. 5: page 198, plate xvii, figure 3.
- 1 2 3 4 5 Call R. E. & Pilsbry H. A. 1886. On Pyrgulopsis, a new genus of rissoid mollusk, with description of two new forms. Proceeding Davenport Academy of Natural Sciences, volume V., page 9-14. Plate II., figure 13.
- ↑ Hershler R. 1994. A review of the North American freshwater snail genus Pyrgulopsis (Hydrobiidae). Smithsonian Contributions to Zoology, 554: 1-115, pages 80-81.
- ↑ Aquatic Mollusca of Illinois, accessed 24 July 2009.
- ↑ Alabama State List of Endangered Mollusks, accessed 24 July 2009.
- 1 2 Marstonia scalariformis NatureServe, Last updated 6 February 2009, accessed 24 July 2009.
External links
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