Description of a large new stonefly species Claassenia xucheni sp. nov. from China (Plecoptera: Perlidae)

Claassenia xucheni sp. nov., a new species of the perlid genus ClaasseniaWu, 1934 is described and illustrated based on eight males and two females collected in the Jiuchongshan National Forest Park, Chongqing city, China. The new species is characterized by round patch of sensilla basiconica on tergum 9, triangular median sclerite between hemitergal lobes, scattered sensilla basiconica on hemitergal lobes, complicated sclerotization pattern on male sternum 9, membranous and curved aedeagus, and by slightly posteromedially protruded female subgenital plate. An annotated checklist of Chinese species of Claasseniais presented based on data from the literature