Marstonia scalariformis, previously known as Pyrgulopsis scalariformis, common name the moss pyrg, is a species of freshwater snail in the family Hydrobiidae.[1][3]
| Marstonia scalariformis | |
|---|---|
| |
| Drawing of apertural view of the shell of Marstonia scalariformis. | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Family: | Hydrobiidae |
| Subfamily: | Nymphophilinae |
| Genus: | Marstonia |
| Species: | M. scalariformis
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| Binomial name | |
| Marstonia scalariformis (Wolf, 1869)
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| Synonyms[3] | |
|
Pyrgula scalariformis Wolf, 1869[2] | |
Shell description
editThe shell is 3.5–4.7 mm (0.14–0.19 in)high with 5.5–6 whorls.[4] The shell is turreted, slender, and chalky white in color. The suture is deeply impressed. The shell is carinate in its entire length on the lower edge of the whorls.[5]
The aperture is small, ovate, but slightly connected with the last whorl.[5]
Anatomy
editThe body of the animal is white.[4]
Distribution
editDistribution of Marstonia scalariformis include Illinois,[1][6] Alabama,[1][7] Iowa, and Missouri, all within the Mississippi River System. Alive specimens are only known from Alabama and Missouri.[1]
This species was abundant on its type locality on the Tazewell shore of the Illinois River in 1880s.[5]
Conservation
editThis species is critically imperiled.[1]
References
edit
- ^ a b c d e f "Marstonia scalariformis Moss Pyrg". NatureServe Explorer. NatureServe. 20 October 2008. Retrieved 16 August 2024.
- ^ Wolf, John (1869). "Descriptions of three new species of shells". American Journal of Conchology. 5: 198 [pl. 17, fig. 3].
- ^ a b Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O, eds. (2024). "Marstonia scalariformis (Wolf, 1870)". MolluscaBase. World Register of Marine Species. Retrieved 16 August 2024.
- ^ a b Hershler, R. (1994). "A review of the North American freshwater snail genus Pyrgulopsis (Hydrobiidae)". Smithsonian Contributions to Zoology. 554 (554): 1–115. doi:10.5479/si.00810282.554. hdl:10088/5139.
- ^ a b c 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.
- ^ "Freshwater snails of Illinois". Illinois Natural History Survey Mollusk Collection. Illinois Natural History Survey. Retrieved 16 August 2024.
- ^ "Alabama Inventory List. The Rare, Threatened, & Endangered Plants & Animals of Alabama" (PDF). Alabama Natural Heritage Program. November 2020. Retrieved 16 August 2024.