Abstract
As part of the ongoing research in the southern Western Ghats, a new species of Baetis Leach is described based on the nymphs collected in the Tamil Nadu, Southern India. Baetis venkataramani sp. nov. does not belong to any of the Baetis species groups proposed so far. The most closely related species to B. venkataramani sp. nov. is B. collinus Müller-Liebenau & Hubbard. However, the new species is distinguished from B. collinus by the presence of tergalius I, posterio-tergal spines absent on the tergites I–VIII and present on the tergum IX and by the size of the labial palp segment III. The main differences between B. venkataramani sp. nov. and other oriental species of Baetis are also discussed.
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