Eosentomon

Nakamura, Osami, 2010, Taxonomic revision of the family Eosentomidae (Hexapoda: Protura) from Japan 2701, Zootaxa 2701, pp. 1-109 : 21-22

Key to Japanese species of Eosentomon

1. Sternite VIII with double rows of setae............................................................ 2

- Sternite VIII with single row of posterior setae..................................................... 21

2. Sternite VIII with nine posterior setae............................................................ 3

- Sternite VIII with seven posterior setae........................................................... 8

3. Empodium on hind tarsus long, longer than 1/2 of claw length......................................... 4

- Empodium on hind tarsus short, less than 1/5 of claw length.......................................... 7

4. Empodium on middle tarsus long, longer than 1/2 of claw length...................................... 5

- Empodium on middle tarsus short, less than 1/5 of claw length........................................ 6

5. Seta rs simple; foretarsal sensillum b'2 thin; t3 thick and surpassing base of α 7............ E. imperiale sp. nov.

- Seta rs inflated; foretarsal sensillum b'2 spatulate; t3 thin and not reaching base of α 7...... E. longispine sp. nov.

6. Labral setae present; foretarsal sensillum t3 thin and not reaching base of α 7; c linear....... E. simulans sp. nov.

- Labral setae absent; foretarsal sensillum t3 thick and surpassing base of α 7; c thick.......... E. ateruii sp. nov.

7. Labral setae present; seta rs inflated; sternites IX and X with 6 setae.................... E. hitakami sp. nov.

- Labral setae absent; seta rs simple; sternites IX and X with 4 setae....................... E. kubotai sp. nov.

8. Empodium on hind tarsus long, longer than 1/2 of claw length......................................... 9

- Empodium on hind tarsus short, less than 1/5 of claw length......................................... 11

9. Labral setae absent; empodium on middle tarsus about 1/3 of claw length................ E. udagawai Imadaté

- Labral setae present; empodium on middle tarsus less than 1/4 of claw length............................ 10

10. Tergites V–VI with five pairs of anterior setae (A1 to A5); foretarsal sensillum b spatulate..... E. dubium sp. nov.

- Tergites V–VI with four pairs of anterior setae (A1, A2, A4, A5); foretarsal sensillum b linear........................................................................................... E. inconditum sp. nov.

11. Pseudoculus with globules; sternites IX and X with 4 setae............................... E. tokui Imadaté

- Pseudoculus without inner structure; sternite IX and X with 6 setae.................................... 12

12. Foretarsal sensillum b'1 present................................................................. 13

- Foretarsal sensillum b'1 absent................................................................. 17

13. Tergite VII with three pairs of anterior setae (A2, A4, A5); foretarsal sensillum b'1 nearer to δ 3' than to δ 4' ..................................................................................... E. impar sp. nov.

- Tergite VII with two pairs of anterior setae (A4, A5); foretarsal sensillum b'1 halfway between δ 3' and δ 4' ..... 14

14. Tergite VII with four pairs of anterior setae (A1, A2, A4, A5); cephalic sensillum as absent.. .. konsenense Imadaté

- Tergite VII with two pairs of anterior setae (A4, A5); cephalic sensillum as present....................... 15

15. Foretarsal sensillum t1 nearer to α 3' than to α 3; a' level with α 3........................... E. asahi Imadaté

- Foretarsal sensillum t1 nearer to α 3 than to α 3'; a' level with t1 ....................................... 16 16. Foretarsus length less than 106 µm; foretarsal sensilla f2, t3 and c' linear; PR = 11–12.......... E. juni Imadaté

- Foretarsus length more than 120 µm; foretarsal sensilla f2, t3 and c' spatulate; PR = 7........ E. furunoi sp. nov.

17. Foretarsal sensillum t1 nearer to α 3 than to α 3' .................................................... 18

- Foretarsal sensillum t1 nearer to α 3' than to α 3 .................................................... 20

18. Cephalic seta aa present; foretarsal sensillum a' level with t1; foretarsus length more than 100 µm......................................................................................... E. kantoense sp. nov.

- Cephalic seta aa absent; foretarsal sensillum a' level with α 3; foretarsus length less than 80 µm............. 19

19. Labral setae present; cephalic seta pa present; foretarsal sensilla t2 and b'2 small......... E. spatulatum sp. nov.

- Labral setae absent; cephalic seta pa absent; foretarsal sensilla t2 and b'2 long.............. E. calvum sp. nov.

20. Tergite V with four pairs of anterior setae (A1, A2, A4, A5); on maxillary palpus, sensillum md longer than ml ............................................................................ E. hiroshianum sp. nov.

- Tergite V with five pairs of anterior setae (A1 to A5); on maxillary palpus, sensillum md as long as ml ................................................................................ E. brachychaetum sp. nov.

21. Sternite VIII without posterior central seta........................................................ 22

- Sternite VIII with a posterior central seta......................................................... 23

22. Foretarsal sensillum t1 nearer to α 3 than to α 3'; tergite VI with two pairs (A4, A5) and tergite VII with one pair (A5) of anterior setae....................................................... E. pacificum Imadaté & Yosii

- Foretarsal sensillum t1 nearer to α 3' than to α 3; tergite VI with four pairs (A1, A2, A4, A5) and tergite VII with two pairs (A4, A5) of anterior setae............................................... E. asakawaense Imadaté

23. Anterior setae A5 on tergites IV–VII absent...................................................... 24

- Anterior setae A5 on tergites IV–VII present...................................................... 26

24. Foretarsal sensilla b'1 and c' thin; posterior accessory seta P1a on tergites II–VI long and posterior to P1–P2 .................................................................................. E. kimum Imadaté

- Foretarsal sensilla b'1 and c' thick; posterior accessory seta P1a on tergites II–VI short and at same level with P1– P2 .................................................................... ... ................ 25

25. Anterior seta A2 on tergite VI present; posterior accessory seta P1a on tergites II–VII capitulate; foretarsal sensillum b spatulate........................................................... E. rishir Nakamura

- Anterior seta A2 on tergite VI absent; posterior accessory seta P1a on tergites II–VII linear; foretarsal sensillum b linear....................................................................... E. nupri Nakamura

26. Posterior accessory seta P1a on abdominal tergite VII at same level with P1–P2 ......................... 27

- Posterior accessory seta P1a on abdominal tergite VII posterior to P1–P2 ............................... 29

27. Foretarsal sensillum b'1 absent.............................................. E. kumei Imadaté & Yosii

- Foretarsal sensillum b'1 present............................................................... 28

28. Tergite V with four pairs of anterior setae (A1, A2, A4, A5), tergite VII with two pairs (A4, A5); pseudoculus with inner structure (3 spots and 4 lines)................................................ E. ornatum sp. nov.

- Tergite V with two pairs of anterior setae (A4, A5), tergite VII with only one pair (A5); pseudoculus without inner structure............................................................... E. sakura Imadaté & Yosii

29. Foretarsal sensillum b'1 absent; tergite VII with two pairs of anterior setae (A4, A5)....................... 30

- Foretarsal sensillum b'1 present; tergite VII with one pair of anterior setae (A5)......................... 34

30. Tergite VI with two pairs of anterior setae (A4, A5)............................... E. mizushimai sp. nov.

- Tergite VI with four pairs of anterior setae (A1, A2, A4, A5).......................................... 31

31. Sternites IX and X with 4 setae; foretarsal sensillum c' posterior to α 6; PR = 8–9.......... E. yezoense Nakamura

- Sternites IX and X with 6 setae; foretarsal sensillum c' anterior to α 6; PR = 11–12....................... 32

32. Pseudoculus with globules; foretarsus length 87–100 µm.................................. E. toi Imadaté

- Pseudoculus without inner structure; foretarsus length less than 70 µm................................. 33

33. Labral setae present; clypeal apodemes indistinct; foretarsal sensillum d reaching base of t3... E. topochi Imadaté

- Labral setae absent; clypeal apodemes distinct; foretarsal sensillum d not reaching base of α 5... E. morei sp. nov.

34. Tergite V with two pairs of anterior setae (A4, A5); tergite XI with 6 setae.............................. 35

- Tergite V with three pairs of anterior setae (A1, A4, A5); tergite XI with 8 setae.......................... 36

35. Foretarsal sensillum b'2 not reaching base of α 6, f2 as long as t3 ..................... E. dounanense Imadaté

- Foretarsal sensillum b'2 reaching base of t3, f2 shorter than t3...................... E. zhanjiangense Zhang

36. Tergite VI with three pairs of anterior setae (A1, A4, A5); foretarsal sensillum t1 near α 3..... E. tokiokai Imadaté

- Tergite VI with two pairs of anterior setae (A4, A5); foretarsal sensillum t1 near α 3' or halfway between α 3 and α 3' ........................................................................... E. yambaru sp. nov.