Isonychia, Eaton, 1871

Muthukatturaja, M., Balasubramanian, C., Rathinakumar, T. & Sivaramakrishnan, K. G., 2021, A new species of Isonychia Eaton, 1871 (Ephemeroptera: Isonychiidae) from Kapila River, Central Western Ghats, India, Zootaxa 4908 (2), pp. 283-291 : 289

Key to the known larvae of Oriental Isonychia

1. Posterolateral projections on abdominal segments I–IX progressively longer and pointed ( You & Su, 1987)............................................................................................... Isonychia kiangsinensis

- Posterolateral projections of anterior abdominal segments blunt and small, acute on segments VIII and IX, largest on segment IX ................................................................................................. 2

2. Terga II–X with a pair of vague oblique stripes ( Kang & Yang, 1994)............................ Isonychia formosana

- Terga II–X without a pair of vague oblique stripes........................................................... 3

3. Ventral cleft of hind femur with 5 spines, claw curved with 6 denticles; tergites II–IV without any distinct stripe medially; abdomen uniform brown, somewhat yellow; tergites V–X with a pair vague oblique stripes............ Isonychia radhae n. sp.

- Ventral cleft of hind femur with 6 spines, claw curved with 8 denticles; terga VII and VIII with paired pale yellow submedian stripe; abdominal terga X pale yellow in anterior ¼ and dark brown in posterior ¾ ( Vasanth et al., 2019)................................................................................................... Isonychia moyarensis