Key to the adults of Cultroribula in Mongolia 1 Legs tridactylous; lamellar cusp longer, but slightly narrower than basal part of lamella, with distal tooth................ 2 – Legs monodactylous; lamellar cusp shorter, but wider than basal part of lamella, without distal tooth.................................................................................................. C. berolina Weigmann, 2006 2 Genital plates with five or six pairs of setae; if lamellar cusp with distal teeth, then median tooth conspicuously developed.. 3 – Genital plates with four pairs of setae; lamellar cusp without inner tooth......................... C. rarisetosa sp. nov. 3 Interlamellar seta long, extending tip of lamellar cusp......................................................... 4 – Interlamellar seta short, not reaching base of lamellar cusp..................................................... 5 4 Tip of rostrum with large teeth deeply incised in-between; interlamellar seta barbed, reaching tip of rostrum; humeral process projected distally............................................................. C. taigagica Bayartogtokh, 2007 – Tip of rostrum with small teeth of similar size, without deep incision; interlamellar seta smooth, not reaching tip of rostrum; humeral process rounded........................................................... C. dentata Willmann, 1950 5 Sensillus fusiform, with very long setiform tip; rostrum with 15–17 teeth, among them three central teeth much larger than lat- eral teeth.............................................................................. C. altaica sp. nov. – Sensillus clavate or fusiform, without long setiform tip; rostrum with 17 teeth, among them five central teeth much larger than lateral teeth.................................................................... C. vtorovi Krivolutsky, 1971

Published as part of Bayartogtokh, Badamdorj, 2012, The genus Cultroribula (Acari: Oribatida: Astegistidae) in Mongolia, with new findings from Altai Mountains and remarks on known species of the world, pp. 44-60 in Zootaxa 3302 on page 58, DOI: 10.5281/zenodo.212417