The following key was prepared based on the diagnostic characters of worldwide Oncopodura species (adapted from Szeptycki 1977, Mari Mutt 1984, Christiansen & Bellinger 1998 and Mehrafrooz Mayvan et al. 2024). This should be considered a tentative key, since the limited data on several important characters in some species included. *considered as species inquirenda, due to insufficient or doubtful data in the original description
1. Without PAO........................................................................................ 2
- With PAO........................................................................................... 6
2. With 4 medial sensilla on Ant IV........................................................................ 3
- With more than 4 medial sensilla on Ant IV............................ O. lebretoni Deharveng, 1988 (France, cave)
3. Mucro with 4 teeth.................................................................................... 4
- Mucro with 5 teeth.......................... O. fadriquei Jordana & Baquero in Jordana et al., 2012 (Spain, cave)
4. Dens with at least 1 basal dorsointernal hooks; with at most 2 blunt sensilla on Ant II............................... 5
- Dens without basal dorsointernal hooks; with 13 blunt sensilla on Ant II..... O. jauzioni Deharveng, 1988 (France, cave)
5. Unguis basal lamella shorter than or equal to half the length of the unguis; Dens with 1 distal dorsoexternal hook and 1 distal dorsointernal hook......................................... O. hamata Carl & Lebedinsky, 1905 (Crimea, cave)
- Unguis basal lamella longer than half the length of the unguis; Dens without distal dorsoexternal hook and with 2 distal dorsointernal hooks......................................... O. occidentalis Bonet, 1931 (Spain & France, cave)
6. PAO with 1 simple lobe................................................................................ 7
- PAO with 3 or more lobes............................................................................. 10
7. Unguis basal lamella shorter than or equal to half the length of the unguis........................................ 8
- Unguis basal lamella longer than half the length of the unguis................................................. 9
8. Claw normal; Ant IV with rounded sensilla.............. O. gledensis Baquero, Vadell & Jordana, 2007 (Spain, cave)
- Claw elongated; Ant IV with short sensilla..................... O. cavernarum Stach, 1934 (Italy and Slovenia, cave)
9. Ant IV without basal blunt sensilla; Ant II with 4 blunt sensilla.................. O. ochokochi sp. nov. (Georgia, cave)
- Ant IV with 1 basal blunt sensillum; Ant II without sensilla................................................................................... O. siquierae Seminario-Cordova, Baquero, Jordana & Vadell, 2018 (Spain, cave)
10. PAO with 3 lobes............................................... O. tricuspidata Cassagnau, 1964 (France, cave)
- PAO with 4 or more lobes............................................................................. 11
11. PAO with 4 lobes.................................................................................... 12
- PAO with more than 4 lobes........................................................................... 14
12. Dens with 1 basal dorsointernal hook; with unguis basal lamella............................................... 13
- Dens with 2 basal dorsointernal hooks; without unguis basal lamella.................................................................................................. O. meridionalis Cassagnau, 1959 (Spain, beech humus)
13. Ant IV without basal sensilla; Dens with 1 distal dorsointernal hook............ O. vioreli Gruia, 1989 (Romania, cave)
- Ant IV with 1 basal sensillum; Dens with 2 distal dorsointernal hooks....................................................................... O. jugoslavica Absolon & Kseneman, 1932 (Bosnia & Herzegovina and Croatia, cave)
14. PAO with 6 simple lobes.............................................................................. 15
- PAO with 6 lobes subdivided into 2 or more fingers........................................................ 16
14. PAO with 6–8 simple lobes; with elongated s setae on Abd V ................... O. pegyi Gruia, 1994 (Romania, cave)
- PAO with 6 simple lobes; s setae on Abd V not elongated.................................................... 15
15. Basal tubercle with 1 ciliated seta and 1scale; unguis normal......................................................................... O. crassicornis Shoebotham, 1911 (England, France, Poland and Hungry, eipigeic and cave)
- Basal tubercle with 2 ciliated setae; unguis much slender................... O. pelissiei Deharveng, 1988 (France, cave)
16. Some PAO lobes simple and some lobes subdivided into 2 fingers. Ant IV with 4 medial sensilla. Dens without basal dorsoexternal hooks, with 1 distal dorsoexternal hook. Dens with 2 basal and 2 distal dorsointernal hooks.............................................................................. O. reyersdorfensis Stach, 1936 (Poland, cave)
- PAO lobes subdivided into 2–3 fingers. Ant IV with 4 medial sensilla. Dens without basal dorsoexternal hooks, with 1 distal dorsoexternal hook. Dens with 3 basal and 4 distal dorsointernal hooks................................................................................................ O. dethieri Janssens & De Bruyn, 2010 (Belgium, cave)
- PAO lobes subdivided into 3 fingers. Ant IV without medial sensilla. Dens with 1 basal and 2 distal dorsoexternal hooks. Dens with 1 basal and 1 distal dorsointernal hook......... O. egerszogensis Loksa, 1961 (Hungary, cave), species inquirenda*