(Pediculaster limosinae Samsinak, 1984 is not separable from P. sellnickianus and is probably a junior synonym of P. sellnickianus; Pediculaster incompletus Samsinak, 1984 is not separable from P. morelliae and is probably a junior synonym of P. morelliae)
1. Coxal fields I with 2 pairs of setae (1 c absent)............................................................. 2
- Coxal fields I with 3 pairs of setae....................................................................... 5
2. Apodemes 5 well-developed........................................................................... 3
- Apodemes 5 absent.................................................... P. minagarici Gao and Zou, 2000. China
3. Dorsal hysterosomal setae relatively short: setae d distinctly shorter than distance d–d.............................. 4
- Dorsal hysterosomal setae very long: setae d distinctly longer than distance d–d........ P. arcanus (Rack, 1967). Germany
4. Setae e and h 2 subequal, setae v 1 more than three times longer than v 2............ P. subarcanus Gao and Zou, 2000. China
- Setae e about 3 times longer than h 2, setae v 1 less than 2 times longer than v 2.. P. ermilovi sp. nov. Russia (Western Siberia).
5. Setae (u) of tibiotarsus I fused together forming structure opposing to tarsal claw.................................. 6
- Setae (u) of tibiotarsus I separated, spine-like....... P. amerahae Sevastianov and Abo-Korah, 1984. Egypt, Turkmenistan
6. Coxal fields II with 2 pairs of setae...................................................................... 7
- Coxal fields II with 3 pairs of setae..................................................................... 13
7. Setae h 2 shorter than h 1................................................................................ 8
- Setae h 2 about 2 times longer than h 1........................................... P. m a n i c a t u s (Berlese, 1904). Italy
8. Setae v 1 and v 2 subequal............................................................................... 9
- Setae v 1 longer than v 2............................................................................... 10
9. Apodemes 5 long, reaching almost to bases of setae 4 b, setae e about 5 times longer than h 2.................................................................................................. P. athiasae (Wicht, 1970). Palaearctic
- Apodemes 5 short, reaching bases of setae 4 a, setae e about 3 times longer than h 2...................................................................................... P. sterculinicola Sevastianov, 1981. Ukraine, Russia (Crimea).
10. Empodia on tarsi II and III with rounded tips, setae f shorter or subequal to h 1................................... 11
- Empodia on tarsi II and III with pointed tips, setae f much longer than h 1................ P. m e n d l i Rack, 1976. Germany
11. Setae f and h 1 subequal............................................................................... 12
- Setae f distinctly shorter than whip-like h 1....................................... P. w e i d n e r i Rack, 1976. Germany
12. Solenidion φ 1 situated close to ω 1............................. P. pfefferianus Samsinak, 1984. Spain, Russia (Crimea)
- Solenidion φ 1 situated close to φ 2.................................... P. muraiae Mahunka and Zaki, 1984. Hungary
13. Setae tc” of tarsus IV situated on distinct protuberance..................................................... 14
- Setae tc” of tarsus IV not on protuberance............................................................... 15
14. Setae h 1 long, whip-like, much longer than f.............................. P. calcaratus (Mahunka, 1965). Palaearctic
- Setae h 1 short, blunt-ended, subequal to f.............................. P. ensifer (Savulkina, 1978). Bulgaria, Ukraine
15. Three pairs of pseudanal setae......................................................................... 16
- Two pairs of pseudanal setae.................................. P. turkiensis (Ramaraju and Madanlar, 1997). Turkey
16. Setae ps 3 distinctly longer than ps 2...................................................................... 17
- Setae ps 2 distinctly longer than ps 3....................................................................... 27
17. Setae ps 1 and ps 2 subequal............................................................................ 18
- Setae ps 1 distinctly shorter than ps 2.............................. P. sklarii Sevastianov and Chydyrov, 1994. Ukraine
18. Setae v 1 subequal to or longer than v 2.................................................................... 19
- Setae v 1 distinctly shorter than v 2.......................... P, hungaricus Mahunka and Zaki, 1982. Hungary, Ukraine.
19. Setae v 1 distinctly longer than v 2........................................................................ 20
- Setae v 1 subequal to v 2............................................................................... 21
20. Setae 2 b about 2 times longer than 2 a.................................... P. j a n v a r y o r u m Mahunka, 1986. Hungary.
- Setae 2 b extremely long, more than 3 times longer than 2 a................... P. mongolicus Mahunka, 1970. Mongolia
21. Setae e and h 2 subequal.............................................................................. 22
- Setae e distinctly longer than h 2........................................................................ 23
22. Setae 2 b much longer than 2 a.............................................. P. dudichi Mahunka, 1970. Hungary
- Setae 2 b and 2 a subequal................................................... P. ignotus (Krczal, 1959). Germany
23. Setae 2 b not longer, or slightly longer than 2 a............................................................. 24
- Setae 2 b about 4 times longer than 2 a............... P. chistyakovi Khaustov and Ermilov, 2008. Russia (European part)
24. Bases of setae h 1 situated very close to bases of h 2......................................................... 25
- Bases of setae h 1 and h 2 distinctly separated from each other................................................. 26
25. Apodemes 5 present, solenidion φ 1 situated closer to setae p” than to solenidion φ 2.... P. dudinskii Khaustov, 2011. Ukraine
- Apodemes 5 absent, solenidion φ 1 situated close to solenidion φ 2... P. zachvatkini (Savulkina, 1978). Russia (European part)
26. Setae 3 a, 3 b, and 4 a short, not reaching bases of subsequent posterior setae.... P. similis Mahunka, 1975. Balkan Peninsula
- Setae 3 a, 3 b, and 4 a long, reaching bases of subsequent posterior setae............. P. altaicus Mahunka, 1969. Mongolia
27. Hysterosomal tergites without longitudinal wrinkles........................................................ 28
- Hysterosomal tergites with distinct longitudinal wrinkles................. P. rugosus Mahunka, 1973. Ukraine, Mongolia
28. Setae 2 a not longer than 2 b........................................................................... 29
- Setae 2 a much longer than 2 b............... P. sellnickianus (Rack, 1964). Central and Eastern Europe, Russia (Crimea)
29. Setae 2 b distinctly longer than 2 a...................................................................... 30
- Setae 2 b and 2 a subequal............................................................................. 31
30. Stigmata 1 -chambered................................................ P. portatus (Martin, 1978). Cosmopolitan
- Stigmata 2 -chambered............................................... P. muscarius (Martin, 1978). Cosmopolitan
31. Empodia on tarsi II and III distinctly thickened distally, relatively short........................................ 32
- Empodia on tarsi II and III long and narrow................................. P. meszarosi Mahunka, 1973. Mongolia
32. Setae f longer than e................................................................................. 33
- Setae f and e subequal................................................. P. morelliae Rack, 197 1 4. Cosmopolitan
33. Setae v 1 at least 2.5 times longer than v 2.................................................................. 34
- Setae v 1 no more than 1.5 times longer than v 2............................................................. 37
34. Stigmata 1 -chambered............................................................................... 35
- Stigmata 2 -chambered................................................. P. m a ly i Samsinak, 1989. Slovakia, Iran
35. Apodemes 5 absent.................................................................................. 36
- Apodemes 5 present.................................................. P. kneeboni (Wicht, 1970). Cosmopolitan
36. Setae ps 1 and ps 3 subequal, tibiotarsus I about 3 times longer than its width.. P. camerikae Khaustov, 2008. Russia (Crimea)
- Setae ps 1 longer than ps 3, tibiotarsus I about 1.5 times longer than its width..... P. eccoptomeralis Camerik, 2010. Belgium
37. Solenidion φ 1 situated laterally between bases of setae pl” and l”............................................. 38
- Solenidion φ 1 situated close to solenidion φ 2 or ω 1.......................................................... 41
38. Setae c 1 shorter or subequal to d........................................................................ 39
- Setae c 1 longer than d.............................................. P. confusus Khaustov, 2008. Russia (Crimea)