A new species of Brevitobrilus Tsalolikhin, Brevitobrilus montanus n, sp., found in high mountain lakes and rivers in Granada, Spain, is described. Additional data on Brevitobrilus granatensis (Ocana & Zullini, 1988) n. comb, are provided. Brevitobrilus montanus n. sp, is characterized by moderate size (1.3-1.8 mm), amphid aperture width one-quarter the head width, subterminal sera distance from terminus four times the width of the terminal end of the tail, and supplements S5 and S6 separated. Tobrilus granatensis Ocana & Zullini, 1988; Tobrilus sardus Vinciguerra & Zullini, 1991; and Tobrilus siculus Vinciguerra & Zullini, 1991 are all transferred to Brevitobrilus. Differences among the 13 species of Brevitobrilus are discussed.