A new species of Isonychia Eaton, 1871 (Ephemeroptera: Isonychiidae) from Kapila River, Central Western Ghats, India Author Muthukatturaja, M. Author Balasubramanian, C. Department of Zoology & Microbiology, Thiagarajar College, Madurai- 625009, Tamil Nadu, India. Author Rathinakumar, T. 0000-0002-3492-5138 Department of Zoology & Microbiology, Thiagarajar College, Madurai- 625009, Tamil Nadu, India. & thangamrathinakumar 1986 @ gmail. com; https: // orcid. org / 0000 - 0002 - 3492 - 5138 thangamrathinakumar1986@gmail.com Author Sivaramakrishnan, K. G. Flat 3, Door No. 7, Gokulam Apartments, Gokulam Colony, West Mambalam, Chennai- 600033. text Zootaxa 2021 2021-01-14 4908 2 283 291 journal article 8830 10.11646/zootaxa.4908.2.9 564539fc-21a1-4a99-94ab-6c3cdb27d622 1175-5326 4438450 8AD40A02-8B2C-42F5-8048-5EAADDCD9C73 Key to the known male imagoes of Oriental Isonychia (excludes I. khyberensis ) 1. Wings light brown, shiny, with dark brown veins ( Ulmer, 1912 )................................ Isonychia formosana - Wings transparent.................................................................................... 2 2. Abdomen red, the postsegmental margins of all tergites and those of the first five sternites pitch black; the following sternites somewhat lighter ( Ulmer, 1913 )............................................................ Isonychia grandis - Abdomen reddish brown; postsegmental margins of terga V–VI pitch black; sterna pale yellow....................... 3 3. Peneal lobe distinctly separated.......................................................................... 5 - Peneal lobe not distinctly separated....................................................................... 4 4. Penes without serrations or large spines and with distal angles rounded, length relatively equal to gonostyli pedestals ( Vasanth et al., 2019 )......................................................................... Isonychia moyarensis - Anterolateral margins of penes rounded with scattered barbs on dorsal surface; penes relatively short, reaching ½ of gonostyli pedestals.......................................................................... Isonychia radhae n. sp. 5. Pterostigma dark brown ( Ulmer, 1939 )...................................................... Isonychia winkleri - Stigmatic area dull white (Hsu, 1936).................................................. Isonychia kiangsinensis