Prosopistoma

Roopa, S. Ramya, Selvakumar, C., Subramanian, K. A. & Sivaramakrishnan, K. G., 2017, A new species of Prosopistoma Latreille, 1833 and redescription of P. indicum Peters, 1967 (Ephemeroptera: Prosopistomatidae) from the Western Ghats, India, Zootaxa 4242 (3), pp. 591-599 : 598

Key to known mature larvae of Indian Prosopistoma species

1. Antennae with 6 segments; ventral margin of fore tibia with 6–8 pectinate setae; carapace general colouration yellowish or medium brown, with various yellow or orange markings (not circular); base of inner canine of mandible with 2 or 3 long bristles.................................................................................................2

- Antennae with 7 segments; ventral margin of fore tibia with 14–15 pectinate setae; carapace general coloration reddish brown, with one pale-coloured circular depression on each side of midline of anterior region of carapace; base of inner canine of mandible with 8–10 long bristles.......................................................... P. someshwarensis n. sp.

2. Carapace general coloration yellowish brown with an irregular (zig-zag) yellow pattern; base of inner canine of mandible with 3 long bristles; gill II leaf-like and unbranched............................................. P. indicum Peters 1967

- Carapace general coloration medium brown, with 4 distinctive orange markings present on each side of midline of the carapace; base of inner canine of mandible with 2 long bristles; gill II leaf-like and cleft................................................................................................... P. coorgum Balachandran & Anbalagan 2016