Isoperlinae, Frison, 1942

Huo, Qing-Bo & Du, Yu-Zhou, 2021, A new genus of Isoperlinae (Plecoptera: Perlodidae) from Tibet, China, Zootaxa 4996 (2), pp. 343-352 : 351

Key to the genera of Isoperlinae

1 Male tergum 10 undivided.............................................................................. 2

- Male tergum 10 divided................................................................................ 5

2 Male possibly with directed lateral processes on abdominal terga; male tergum 10 without sclerotized extending, cleft or sclerotized hooks............................................................................ Kaszabia / Isoperla

- Male without abdominal processes....................................................................... 3

3 Male and female tergum 10 have a developed sclerotized process...................................... Parisoperla

- Male tergum 10 with process or spines.................................................................... 4

4 Male tergum 10 have a reflexed pointed process................................................ Cosumnoperla

- Male tergum 10 with 2 large, recurved, flaplike posteromedian lobes; Supra-anal process small and unsclerotized..................................................................................................... Calliperla

5 Posterior margin of male tergum 10 with median notch, without outgrowth........................................ 6

- Posterior margin of male tergum 10 with developed outgrowth................................................. 7

6 Male tergum 10 having a shallow posteromedian cleft and bipartite posteromedian upturned ridges with row of short stout spines, and a membranous, rounded, bulbous posteromedian structure; paraprocts flat, unsclerotized............ Clioperla

- Male tergum 10 with several large apical erect setae; sclerotized paraprocts with separate apical sclerite...... Tibetisoperla

7 Outgrowths of male tergum 10 located in the middle of the posterior margin, short, hook-shaped, directed forward and upward..................................................................................... Mesoperlina

- Male tergum 10 with partial cleft extending from posterior margin, posterolateral margins of cleft developed into elongate, tapered, sclerotized genital hooks.............................................................. Cascadoperla