Nipponentomon Imadaté & Yosii, 1959

Bu, Yun, Wu, Dong Hui, Shrubovych, Julia & Yin, Wen Ying, 2013, New Nipponentomon species from northern Asia (Protura: Acerentomata, Nipponentomidae), Zootaxa 3636 (4), pp. 525-546 : 545

Key to the world species of the genus Nipponentomon Imadaté & Yosii, 1959

1. Tergite VII without seta P1a ............................................................................. 2

- Tergite VII with seta P1a ................................................................................... 4

2. Tergite I with seta A3, sternites IV–VI with 3 anterior setae....... N. imadatei Bu, Wu & Yin sp. nov.; China (Heilongjiang)

- Tergite I without seta A3, sternites IV–VI with 5 anterior setae..................................................... 3

3. Tergite VI with seta P1a..................................... N. khabarovskense Nakamura, 2004 ; Russia (Far East)

- Tergite VI without seta P1a............................................. N. jaceki Shrubovych 2009 ; Russia (Far East)

4. Sternites IV–VI with 3 anterior setae...................... N. pembertonense Bernard & Biechele 2008 ; USA (Maryland)

- Sternites IV–VI with 5 anterior setae......................................................................... 5

5. Tergite VII with seta P3a ............................................................................... 6

- Tergite VII without seta P3a ................................................................................ 7

6. Sternite VIII with 4/0 setae, sensillum f short....................................... N. bifidum Rusek, 1974 ; Canada

- Sternite VIII with 4/2 setae, sensillum f extremely long...... N. uenoi paucisetosum Imadaté, 1965 ; China (Jilin), Japan, Korea

7. Tergite VII with seta Pc.................................................. N. kamui Imadaté, 1965 ; Japan (Hokkaido)

- Tergite VII without seta Pc ................................................................................. 8

8. Claw with two inner teeth...................... N. bidentatum Nakamura, 2004 ; China (Heilongjiang), Russia (Far East)

- Claw with one inner tooth.................................................................................. 9

9. Tergite I with seta A3 .................................................................................. 10

- Tergite I without seta A3 .................................................................................. 11

10. Tergites II–VI with seta P3a...................................... N. uenoi uenoi Imadaté & Yosii, 1959; Japan, Korea

- Tergites II–VI without seta P3a................................... N. heterothrixi Yin & Xie, 1993; China (Jilin), Korea

11. Tergites II–VI with seta P3a........................................... N. aureitarsum (Ewing, 1940) ; USA (Virginia)

- Tergites II–VI without seta P3a ............................................................................ 12

12. Tergite I with seta P0a, sternite II with 3/5 setae and sternite III with 3/6 setae...................................................................................................... N. taiga Shrubovych sp. nov.; ( Russia (Siberia)

- Tergite I without seta P0a, sternites II–III with 5/5 setae....................................................... 13

13. Sensillum b longer than c .............................................................................. 14

- Sensillum b equal to or shorter than c ........................................................................ 15

14. Sensillum b extremely long, surpassing base of claw................... N. californicum (Hilton, 1929) ; USA (California)

- Sensillum b reaching base of g, not surpassing base of claw............................. N. kevani Rusek, 1974 ; Canada

15. Labrum not protruded..................................................... N. macleani Nosek, 1977 ; USA (Alaska)

- Labrum protruded.................................................................................... 16

16. Labrum rather long, LR=5.0; foretarsal setae β 1 and δ 4 sensilliform................. N. andrei (Ewing, 1940) ; USA (Utah)

- Labrum relatively short, LR=6.1–7.8; foretarsal seta β 1 sensilliform, δ 4 setiform................................................................................................ N. nippon (Yoshii, 1938) ; China (Jilin), Japan, Korea