Wet rock physa
The Wet rock physa, scientific name Physella zionis, is a species of freshwater snail, an aquatic pulmonate gastropod mollusc in the family Physidae, the bladder snails. This species is endemic to two connected canyons, Zion Canyon and Orderville Canyon, along the north fork of the Virgin River in Zion National Park, Washington County, Utah, a stretch of about  (Oliver & Bosworth 1999). References

Oliver, G. V. and Bosworth, W. R. III. (1999). Rare, Imperiled, and Recently Extinct or Extirpated Mollusks of Utah: A Literature Review. Utah Division of Wildlife Resources. Publication Number 99-29. Physidae
Molluscs of the United States
Endemic fauna of Utah
Taxa named by Henry Augustus Pilsbry
Gastropods described in 1926
Taxonomy articles created by Polbot