The Nearctic species Shipsa rotunda (Claassen, 1923) (Plecoptera: Nemouridae)

The morphological concept of Nearctic Shipsa rotunda (Claassen, 1923) (Plecoptera: Nemouridae) was reviewed based on examination of adult males and adult females from across the extensive range of this species. Reproductive terminalia were studied with scanning electron microscopy from five locations, three from Canada and two from the USA. Despite the wide distribution, there is little morphological variation exhibited by males and females. New records are noted for one Canadian province and six US states. Scanning electronic and standard light microscopy images plus a dot distribution map based on museum and valid literature data are provided. Key words: Plecoptera, Nemouridae, Shipsa rotunda, United States, Canada, stoneflies