(F. G. Thompson, 1977)
Pyrgulopsis ogmorhaphe (F. G. Thompson, 1977)
Marstonia ogmorhaphe, common names the royal marstonia or royal springsnail, is a minute species of freshwater snail, an aquatic gastropod mollusk or micromollusk in the family Hydrobiidae, the mud snails. This species is endemic to Tennessee in the United States, where it occurs in two streams in Marion County. It is a federally listed endangered species of the United States.
This snail was first described in 1977. It is under 5 millimeters long. It lives in the diatomaceous ooze and debris in springs. It is limited to the Sequatchie River Valley, where it lives in Blue Spring, the water supply for the town of Jasper, Tennessee, and the stream just past the spring. It also lives in Owen Spring, four miles away.
- Cordeiro, J. & Perez, K. (2012). "Marstonia ogmoraphe". The IUCN Red List of Threatened Species. IUCN. 2012: e.T18978A1937701. doi:10.2305/IUCN.UK.2012-1.RLTS.T18978A1937701.en. Retrieved 15 January 2018.
- Withers, D. I. (2003). A resurvey for the royal snail (Marstonia ogmorhaphe). Final report. Revenue Grant #1448-40181-02-G-050. Tennessee Division of Natural Heritage, Nashville, 63 pp.
- USFWS. Marstonia ogmorhaphe Recovery Plan. August 1995.
- USFWS. Determination of endangered status for the Royal Snail and Anthony's Riversnail. Federal Register April 15, 1994.
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