A new species of small cyclopoids from subterranean waters of India is described in a newly established subgenus,Kiefercyclops n.sg., of the genus Haplocyclops Kiefer, 1952. Genital double-somite with ovipores situated in the posterior half,antennula without the lateral seta on the ultimate segment, and caudal rami with the lateral seta inserted in the proximal half areamong the most important characters of H. (K.) fiersi n.sp., that warrant its position in the genus Haplocyclops. Also, the newspecies differs from the other six congeners by several autapomorphic characters, most of them being reductions in armatureand/or segmentation of the appendages. In particular, the degree of reductions concerning the segmentation of the swimminglegs makes it the most reduced free-living cyclopoid, with both rami of third and fourth legs, as well as the endopod of secondleg being one-segmented in both sexes. A key to species of Haplocyclops is given at the end of this paper.