| Marstonia scalariformis | |
|---|---|
| Drawing of apertural view of the shell of Marstonia scalariformis. | |
| Conservation status | |
|
NE[1]
|
|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| (unranked): | clade Caenogastropoda clade Hypsogastropoda |
| Superfamily: | Rissooidea |
| Family: | Hydrobiidae |
| Subfamily: | Nymphophilinae |
| Genus: | Marstonia |
| Species: | M. scalariformis |
| Binomial name | |
| Marstonia scalariformis (Wolf, 1869)[2] |
|
| Synonyms | |
|
Pyrgula scalariformis Wolf, 1869 |
|
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.
Contents |
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]
The body of the animal is white.[4]
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]
This species is critically imperiled.[7]
This article incorporates public domain text from reference.[3]