Two new mayfly species belonging to the family Baetidae, namely Platybaetis arunachalae sp. nov. and Indobaetis michaelohubbardi sp. nov., are described from nymphs collected in the Ramanadi and Tamiraparani rivers, respectively, of the southern Western Ghats, Tamil Nadu, India. Generic diagnosis based on nymphs and key to known species of Platybaetis and Indobaetis are also provided.
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