AQUATIC NEMATODES FROM ETHIOPIA .8. ENOPLIDS, WITH DESCRIPTIONS OF BREVITOBRILUS-FESEHAI N-SP AND BREVITOBRILUS-TSALOLIKHINI N-SP (ENOPLIDA, NEMATODA)

Two new and one known species of the genus Brevitobrilus, Epitobrilus setosus, Tripyla glomerans, and Ironus ignavus and I. sphincterus are described from sediments of Lakes Shala, Tana and Ziway, and River Abb ay, Ethiopia. Brevitobrilus fesehai n. sp. can be recognized by a comb ination of characteristics: in having a narrow anterior end, short cep halic and outer labial setae, long and bow-shaped spicules, the poster iormost supplement at a distance of less than a spicule length from cl oacal opening, numerous micropapillae, and terminal and subterminal se tae. B. tsalolikhini n.sp. can also easily be differentiated from all known species in the genus in having a combination of characteristics: long cephalic and outer labial setae, short spicules without median s tiffening piece, the posteriormost supplement situated very close to t he cloacal opening, supplements with straight duct that merges with th e dorsal wall of the ampulla, and elongate spermatozoa. The remaining five species are described in detail. Also scanning electron microscop ic pictures of B. fesehai n.sp., B. tsalolikhini n.sp., Epitobrilus se tosus and Tripyla glomerans are presented.