A new species of Choroterpes Eaton, 1881 (Ephemeroptera: Leptophlebiidae: Atalophlebiinae) from Western Himalaya, India Author Kubendran, T. Zoological Survey of India, Prani Vigyan Bhawan, M-Block, New Alipore, Kolkata - 700053, West Bengal, India; Email: tkbaetis @ gmail. com, fatima. jab 93 @ gmail. com Author Vasanth, M. Zoological Survey of India, Southern Regional Centre, Santhome High Road, Chennai - 600028, India; Email: vasan 071994 @ gmail. com, subbuka. zsi @ gmail. com Author Subramanian, K. A. Zoological Survey of India, Southern Regional Centre, Santhome High Road, Chennai - 600028, India; Email: vasan 071994 @ gmail. com, subbuka. zsi @ gmail. com Author Selvakumar, C. Department of Zoology, The Madura College (Autonomous), Madurai - 625011, Tamil Nadu, India; Email: selvaaa 06 @ gmail. com Author Jabeen, Fatima Zoological Survey of India, Prani Vigyan Bhawan, M-Block, New Alipore, Kolkata - 700053, West Bengal, India; Email: tkbaetis @ gmail. com, fatima. jab 93 @ gmail. com Author Sivaramakrishnan, K. G. Flat No 3, Door No 7, Gokulam Apartment, Gokulam Colony, West Mambalam, Chennai - 600033, India; Email: kgskrishnan @ gmail. com text Records of the Zoological Survey of India 2022 2022-12-31 122 3 237 245 journal article 10.26515/rzsi/v122/i3/2022/168287 2581-8686 13185706 Larval Key to the known Species of Subgenus Choroterpes in India 1. Gill 1 single; upper and lower lamellae of gills 2–7 with 3 apical processes, median process relatively slender and longer than laterals ................................................. 2 - Gill 1 double; upper and lower lamellae of gills 2–7 with 3 apical processes, median process relatively larger and longer than laterals .................................................... Choroterpes ( C. ) petersi 2. Gill 1 basally broad and distally lanceolate ....................................... Choroterpes ( C. ) kumaradhara - Gill 1 not as above.......................................................... 3 3. Upper and lower lamellae of gills 2–7 broad.............. 4 - Upper and lower lamellae of gills 2–7 not broad ...................................... Choroterpes ( C. ) andamanensis 4. Claw apically hooked with a row of 13–14 denticles; anteromedian emargination of labrum with denticles ........................ Choroterpes ( C. ) girigangaensis sp. nov. - Claw apically hooked with a row of 4–5 denticles, anteromedian emargination of labrum without denticles.................................... Choroterpes ( C. ) kaegies