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Marstonia scalariformis

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Marstonia scalariformis
Pyrgulopsis scalariformis shell.jpg
Drawing of apertural view of the shell of Marstonia scalariformis.
Status TNC G1.svg
Critically Imperiled (NatureServe) [1]
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Littorinimorpha
Family: Hydrobiidae
Subfamily: Nymphophilinae
Genus: Marstonia
Species:
M. scalariformis
Binomial name
Marstonia scalariformis
(Wolf, 1869)
Synonyms [2]

Pyrgula scalariformisWolf, 1869 [3]
Pyrgulopsis scalariformis(Wolf, 1869)
Pyrgula scalariformis var. mississippiensisPilsbry, 1886
Pyrgulopsis mississippiensisPilsbry, 1886

Contents

Marstonia scalariformis, previously known as Pyrgulopsis scalariformis, common name the moss pyrg, is a species of freshwater snail in the family Hydrobiidae. [1] [2]

Shell description

The 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

The body of the animal is white. [4]

Distribution

Distribution 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

This species is critically imperiled. [1]

References

  1. 1 2 3 4 5 6 NatureServe. "Marstonia scalariformis". NatureServe Explorer. Arlington, Virginia. Retrieved 16 August 2024.
  2. 1 2 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.
  3. ↑ Wolf, John (1869). "Descriptions of three new species of shells". American Journal of Conchology. 5: 198 [pl. 17, fig. 3].
  4. 1 2 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.
  5. 1 2 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.
  6. ↑ "Freshwater snails of Illinois". Illinois Natural History Survey Mollusk Collection. Illinois Natural History Survey. Retrieved 16 August 2024.
  7. ↑ "Alabama Inventory List. The Rare, Threatened, & Endangered Plants & Animals of Alabama" (PDF). Alabama Natural Heritage Program. November 2020. Retrieved 16 August 2024.
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