First Occurrences of Lithasia armigera and Lithasia verrucosa (Gastropoda: Pleuroceridae) in the Mississippi River

Abstract Lithasia armigera (Armored Rocksnail) historically occurred in the Cumberland, Ohio, and Tennessee river drainages of eastern North America, whereas Lithasia verrucosa (Verrucose Rocksnail) is known from the Ohio, Tennessee, and Black river drainages. Prior to our 24–27 September 2012 surveys, neither species had been recorded from the Mississippi River. We discovered Armored Rocksnail near the Mississippi River-Missouri River confluence in the St. Louis metropolitan area, and both Armored Rocksnail and Verrucose Rocksnail 5 linear miles east-northeast of Osceola, AR.

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