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
clade Littorinimorpha

Superfamily: Rissooidea
Family: Hydrobiidae
Subfamily: Nymphophilinae
Genus: Marstonia
Species: M. scalariformis
Binomial name
Marstonia scalariformis
(Wolf, 1869)[2]
Synonyms

Pyrgula scalariformis Wolf, 1869
Pyrgulopsis scalariformis (Wolf, 1869)
Pyrgula scalariformis var. mississippiensis Pilsbry, 1886
Pyrgulopsis mississippiensis Pilsbry, 1886

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]

  1. ↑ IUCN 2009. IUCN Red List of Threatened Species. Version 2009.1. <www.iucnredlist.org>. Downloaded on 24 July 2009.
  2. ↑ Wolf (1869). Am. Jour. Conch. 5: page 198, plate xvii, figure 3.
  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.
  4. ↑ Hershler R. 1994. A review of the North American freshwater snail genus Pyrgulopsis (Hydrobiidae). Smithsonian Contributions to Zoology, 554: 1-115, pages 80-81.
  5. ↑ Aquatic Mollusca of Illinois, accessed 24 July 2009.
  6. ↑ Alabama State List of Endangered Mollusks, accessed 24 July 2009.
  7. 1 2 Marstonia scalariformis NatureServe, Last updated 6 February 2009, accessed 24 July 2009.
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