Pediculaster ermilovi, Khaustov, Alexander A., 2015

Khaustov, Alexander A., 2015, Two new species of the genus Pediculaster (Acari: Pygmephoridae) from Western Siberia, Russia, Zootaxa 3926 (3), pp. 413-429 : 425-426

Key to phoretic females of the genus Pediculaster of Palaearctic

( 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)