Marstonia scalariformis
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.
Marstonia scalariformis | |
---|---|
Drawing of apertural view of the shell of Marstonia scalariformis. | |
NE[1] | |
Scientific classification | |
Kingdom: | |
Phylum: | |
Class: | |
(unranked): | |
Superfamily: | |
Family: | |
Subfamily: | Nymphophilinae |
Genus: | |
Species: | M. scalariformis |
Binomial name | |
Marstonia scalariformis (Wolf, 1869)[2] | |
Synonyms | |
Pyrgula scalariformis Wolf, 1869 |
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: p. 198, plate xvii, figure 3.
- 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, pp. 80–81.
- Aquatic Mollusca of Illinois, accessed 24 July 2009.
- Alabama State List of Endangered Mollusks, accessed 24 July 2009.
- Marstonia scalariformis NatureServe, Last updated 6 February 2009, accessed 24 July 2009.
External links
Wikimedia Commons has media related to Marstonia scalariformis. |