Isonychia, Eaton, 1871

Huang, Dong-Dong, Shen, Chen-Yang, Huang, Gui-Ying, Ye, Lin-Yu, Wu, Hui-Yuan, Zhang, Shu-Sheng & Cheng, Hong-Yi, 2024, A new species of Isonychia Eaton, 1871 (Ephemeroptera: Isonychiidae) from Taishun, China based on morphological characteristics and COX 1 gene, Zootaxa 5437 (4), pp. 537-548 : 546

Modified key to the known larvae of Isonychia in China based on Qiang & Zhou (2023)

1 Apical margin of gills without spines, and abdominal tergum X with a pair of pale dots.................... I. vshivkovae

- Apical margin of gills (particularly gill plates VI and VII) with spines, and abdominal tergum X with dark posterior 1/2.... 2

2 Abdominal terga I–IX with transverse pale spots.................................................... I. ussurica

- At least abdominal terga I–IV with longitudinal midline....................................................... 3

3 Abdominal terga I–IV with a distinct longitudinal midline..................................................... 4

- Abdominal terga I–IX with pale longitudinal midline......................................................... 5

4 Abdominal terga V–IX without pale longitudinal midline or a pair of vague oblique stripes................. I. taishunensis

- Abdominal terga II–X with a pair of vague oblique stripes........................................... I. formosana

5 Gill plate with distinct purple to dark dot(s)................................................................ 6

- Gill plate colorless and transparent....................................................................... 7

6 Each gill plate with a small apical dark dot........................................................... I. ignota

- Each gill plate with three purple dots, a larger median one, a small apical one, and the smallest anterolateral one................................................................................................. I. kiangsinensis

7 Abdominal tergum X with dark posterior 1/2...................................................... I. sexpetala

- Whole abdominal tergum X with brown........................................................... I. japonica