Marstonia scalariformis
| Marstonia scalariformis | |
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| Drawing of apertural view of the shell of Marstonia scalariformis. | |
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| 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 | |
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Marstonia scalariformis (Wolf, 1869) |
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| Synonyms | |
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Pyrgula scalariformis Wolf, 1869 |
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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.
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.
The aperture is small, ovate, but slightly connected with the last whorl.
The height of the shell is 12.7 mm (½ inch).
The body of the animal is white.
Distribution of Marstonia scalariformis include Illinois,Alabama,Iowa and Missouri.
This species was abundant on its type locality on the Tazewell shore of the Illinois River in 1880s.
This species is critically imperiled.
This article incorporates public domain text from reference.
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