| Marstonia | |
|---|---|
 | |
| shell of Marstonia comalensis | |
 | |
| Apertural view of a shell of Marstonia scalariformis . | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Family: | Hydrobiidae |
| Subfamily: | Nymphophilinae |
| Genus: | Marstonia Baker, 1926 [1] |
| Diversity [2] | |
| 16 valid species | |
Marstonia is a genus of freshwater snails with a gill and an operculum, aquatic gastropod molluscs in the family Hydrobiidae.
Species in the genus Marstonia are distributed in springs, streams and lakes in eastern North America. [3] Most of these species have extremely narrow geographic ranges and consequently have become a focus of conservation activities; two are federally listed as endangered and others are variously listed by state wildlife agencies. [3]
The freshwater gastropod genus Marstonia is composed of 15 small (shell height < 5.0 mm), ovate- to elongate-shelled species. [3] Marstonia differs from the other eight North American nymphophiline genera in that the (female) oviduct and bursal duct join well in front of (instead of behind) the posterior wall of the pallial cavity. [3] It has also been resolved as a well supported sub-clade within its subfamily based on mtDNA sequences. [3]
Eastern North American species of Pyrgulopsis [4] are considered to be in separate genus Marstonia according to Thompson & Hershler (2002). [5]
Other species of Marstonia include:
Although Marstonia has been reviewed four times since 1978 (Thompson 1978, Hershler 1994, Thompson & Hershler 2002, Hershler & Liu 2011), three of its congeners have been little studied beyond their original descriptions and their anatomy is unknown. [3] Two of these — Marstonia olivacea , Marstonia ozarkensis — may be extinct and thus will likely remain incertae sedis. [3]
Tryonia is a genus of freshwater snails in the family Hydrobiidae. This genus is sometimes placed in the family Cochliopidae
Amnicola is a genus of very small freshwater snails which have an operculum. Amnicola species are aquatic prosobranch gastropod mollusks in the family Amnicolidae according to the taxonomy of the Gastropoda.
Cincinnatia is a genus of very small freshwater snails that have an operculum, aquatic gastropod molluscs in the family Hydrobiidae, the mud snails.
The phantom cave snail or phantom cavesnail is a species of very small freshwater snail with an operculum, an aquatic gastropod in the family Hydrobiidae.
Cochliopa is a genus of freshwater snails, specifically cave snails, aquatic gastropod mollusks in the family Cochliopidae.
The Moapa pebblesnail also known as the Muddy Valley turban snail, scientific name Pyrgulopsis avernalis, is a species of small freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
Phreatodrobia is a genus of very small or minute freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Lithoglyphidae.
Pyrgulopsis is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae.
The Duckwater pyrg, scientific name Pyrgulopsis aloba, is a species of freshwater snail in the family Hydrobiidae. It is endemic to the United States and only known from two springs in the Duckwater Reservation, Nye County, Nevada.
Marstonia castor, common name the beaver pond marstonia, is a species of very small freshwater snail with a gill and an operculum, an aquatic operculate gastropod mollusc in the family Hydrobiidae. This species was endemic to a very limited area of the US state of Georgia, mostly to streams and creeks around Lake Blackshear.
The Fairbanks springsnail, scientific name Pyrgulopsis fairbanksensis, is a species of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Hydrobiidae.
Marstonia olivacea, common name the olive marstonia, was a species of very small freshwater snail, an aquatic gastropod mollusk in the family Hydrobiidae. This species was endemic to Alabama, the United States. Its natural habitat was rivers. This species is now extinct.
Cochliopidae is a family of small freshwater snails with gills and an operculum, aquatic gastropod mollusks.
The Socorro springsnail, scientific name Pyrgulopsis neomexicana, is an endangered species of minute freshwater snail with a gill and an operculum, an aquatic gastropod mollusk or micromollusk in the family Hydrobiidae, the mud snails.
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 mollusc in the family Hydrobiidae.
Marstonia comalensis is a species of minute freshwater snail with a gill and an operculum, an aquatic gastropod mollusk or micromollusk in the family Hydrobiidae. It is found in south central Texas, United States.
Floridobia is a genus of very small freshwater snails that have an operculum, in the family Hydrobiidae, the mud snails.
Pyrgulopsis arizonae, commonly known as the Apache springsnail, is a species of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Hydrobiidae.
Pyrgulopsis carinifera is a species of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Hydrobiidae.
This article incorporates CC-BY-3.0 text from the reference [3]
{{cite web}}: CS1 maint: archived copy as title (link)| Authority control databases: National |
|---|
