Marstonia ozarkensis

Marstonia ozarkensis, common name the Ozark pyrg, is a species of very small or minute freshwater snails with an operculum, aquatic gastropod molluscs in the family Hydrobiidae. This species was endemic to Missouri and Arkansas^[2] in the United States and was presumed extinct by the U.S. Fish and Wildlife Service as of December 2018.^[3]

Marstonia ozarkensis
Conservation status
Critically endangered, possibly extinct  (IUCN 3.1)[1]
Critically Imperiled  (NatureServe)[2]
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Family:	Hydrobiidae
Genus:	Marstonia
Species:	M. ozarkensis
Binomial name
Marstonia ozarkensis (Hinkley, 1915)
Synonyms
Pyrgulopsis ozarkensis Hinkley, 1915

This species was named after the Ozarks, a highland region of the United States.