A new species of fleas of the family Leptopsyllidae, Phaenopsylla aiderensis sp. n., from Turkmenia (Ai-Dere, 40 km eastwards of Kara-Kala) is described. The male of Ph. aiderensis differs in the following characters: movable process falcate with low-convex hind edge, hind edge of the clasper broad-spherical, scable-like bristles on the distal arm of sternum IX absent. The female of the new species is characterized by the following characters: frontal tubercle simple, non-submersed, tergum VII with two antepygidial bristles; sternum VII with broad-spherical hind edge and two rows of bristles. Anal stylet 2 times as long as wide. Ventral wall of the anal sternum straight. Dorsal edge of the hind tibia bears 5 pairs of stout bristles, single bristle between 2nd and 3rd pairs of bristles.