Onychiurus

Arbea, Javier, 2012, Review of the genus Onychiurus Gervais, 1841 (Collembola: Onychiuridae) with description of a new cave species from Southern Spain, Zootaxa 3564, pp. 33-46 : 43-44

Key to the world species of Onychiurus

1 Th. I without dorsal pseudocelli......................................................................... 2

- Th. I with dorsal pseudocelli.......................................................................... 18

2 Th. I–III with 0,2,2 dorsal pseudocelli.................................................................... 3

- Th. I–III with 0,3,3 dorsal pseudocelli.................................................................... 7

3 Abd. IV with 3+3 dorsal pseudocelli............................................................... O. wilchi

- Abd. IV with more dorsal pseudocelli.................................................................... 4

4 Abd. IV with 4+4 dorsal pseudocelli............................................................ O. gulinensis

- Abd. IV with 5+5 dorsal pseudocelli...................................................................... 5

5 Abd. I without ventral pseudocelli.............................................................. O. saphianus

- Abd I with 1+1 ventral pseudocelli...................................................................... 6

6. Abd. IV without ventral pseudocelli............................................................... O. bhattii

- Abd. IV with 2+2 ventral pseudocelli.......................................................... O. steinmanni

7 Abd. IV with 3+3 dorsal pseudocelli...................................................................... 8

- Abd. IV with more dorsal pseudocelli.................................................................... 15

8 Abd. I–III with 4,4,4 dorsal pseudocelli........................................................ O. gevi sp. nov.

- Abd. I–III with 3,3,3 dorsal pseudocelli ( obsiones group sensu Kaprus’, 2008).................................... 9

9 Sense organ of Ant. III with 4 papillae................................................................... 10

- Sense organ of Ant. III with 5 papillae................................................................... 11

10 Formula of parapseudocelli on Abd. sterna as 11100; Ratio length AS /inner edge of claw III 1.00–1,27......... O. vtorovi

- Formula of parapseudocelli on Abd. sterna as 11101; Ratio length AS /inner edge of claw III 0.66–1.00........... O. darii

11 Th. I with 6+6 dorsal chaetae; distal whorl on tibiotarsi with 7 chaetae.......................................... 12

- Th. I with 7+7 dorsal chaetae; distal whorl on tibiotarsi with 9 chaetae.................................... O. jaceki

12 Sense organ of Ant. III with 4 guard chaetae.............................................................. 13

- Sense organ of Ant. III with 5 guard chaetae..................................................... O. sarmaticus

13 VT with 1+1 chaetae at base. Abd. V tergum with a3 as macrochaetae (a3 chaeta longer than a1)............. O. obsiones

- VT without chaetae at base............................................................................ 14

14 Abd. V tergum with a3 as macrochaetae (a3 chaeta longer than a1); empodial appendage half as long as inner edge of claw............................................................................................ O. szeptyckii

- Abd. V tergum with a3 as microchaetae (a3 chaeta shorter than a1); empodial appendage as long as inner edge of claw............................................................................................ O. orienteuropeus

15 Abd. IV with 4+4 dorsal pseudocelli.................................................................... 16

- Abd. IV with 5+5 dorsal pseudocelli.................................................................... 17

16 Th. I–III without ventral pseudocelli.............................................................. O. boldorii

- Th. I.III with 1,1,1 ventral pseudocelli............................................................ O. stillicidii

17 Abd. I–II with 1+1 ventral pseudocelli. Empodial lamella present..................................... O. nathanieli

- Abd. I–II with 2+2 ventral pseudocelli. Empodial lamella absent........................................ O. paoletti

18 Th. I–III with 3,3,5 dorsal pseudocelli............................................................. O. willemi

- Th. I–III with 1(2),3(2),3(2) dorsal pseudocelli............................................................ 19

19 Abd. V with 3+3 dorsal pseudocelli..................................................................... 20

- Abd. V with 4+4 dorsal pseudocelli..................................................................... 35

20 Abd. IV with 3+3 dorsal pseudocelli......................................................... O. polychaetosus

- Abd. IV with more dorsal pseudocelli................................................................... 21

21 Abd. IV with 4+4 dorsal pseudocelli.................................................................... 22

- Abd. IV with 5+5 dorsal pseudocelli.................................................................... 26

22 Head with 1+1 ventral pseudocelli........................................................... O. decemsetosus

- Head with 2+2 ventral pseudocelli...................................................................... 23

23 Abd. IV with 1+1 ventral pseudocelli................................................................... 24

- Abd. IV with 2+2 ventral pseudocelli.................................................................... 25

24 Abd. I with 2+2 ventral pseudocelli................................................... O. subambulans (partim)

- Abd. I without ventral pseudocelli.............................................................. O. antennalis

25 Abd. II with 1+1 ventral pseudocelli............................................................ O. ariegicus

- Abd. II with 2+2 ventral pseudocelli................................. O. ambulans sensu Stach, 1934 & Gisin, 1956

26 Head with 2+2 ventral pseudocelli...................................................................... 27

- Head with 3+3 ventral pseudocelli...................................................................... 32

27 Abd. IV with 1+1 ventral pseudocelli................................................. O. subambulans (partim)

- Abd. IV with 2+2 ventral pseudocelli................................................................... 28

28 Abd. I with 1+1 ventral pseudocelli...................................................................... 29

- Abd. I with 2+2 ventral pseudocelli.................................................. O. circulans from Madeira

29 Abd. II with 1+1 ventral pseudocelli.................................................................... 30

- Abd. II with 2+2 ventral pseudocelli.......................................................... O. furcisetosus

30 Dorsal macrochaetae apically rounded......................................................... O. confugiens

- Dorsal macrochaetae forked at the tip................................................................... 31

31 Formula of parapseudocelli on Abd. sterna as 101003. Males with ventral organ....................... O. rectospinatus

- Formula of parapseudocelli on Abd. sterna as 111003. Males without ventral organ......................... O. reluctus

32 Th. I–III without ventral pseudocelli.......................................................... O. dissimulans

- Th. I–III with 0,1,1 ventral pseudocelli.................................................................. 33

33 Abd. III with 2+2 ventral pseudocelli......................................................... O. subcirculans

- Abd. III with 1+1 ventral pseudocelli................................................................... 34

34 Abd. II with 1+1 ventral pseudocelli.............................................................. O. movilae

- Avd. II with 2+2 ventral pseudocelli............................... O. circulans ; O. ambulans sensu Pomorski, 1998

35 Abd. IV with 5+5 dorsal pseudocelli.................................................................... 36

- Abd. IV with 6+6 dorsal pseudocelli............................................................ O. penetrans

36 Head with 2+2 ventral pseudocelli...................................................................... 37

- Head with 3+3 ventral pseudocelli...................................................................... 38

37 Abd. I–IV with 1,2,1,1 ventral pseudocelli...................................................... O. reluctoides

- Abd. I–IV with 2,2,2,1 ventral pseudocelli........................................................... O. ortus

38 Abd. IV with 1+1 ventral pseudocelli........................................................... O. sublegans

- Abd. IV with 2+2 ventral pseudocelli................................................................... 39

39 Abd. III with 1+1 ventral pseudocelli............................................................... O. arans

- Abd. III with 2+2 ventral pseudocelli........................................................... O. insinuans