Dicranocentrus

Ma, Yitong & Chen, Jian-Xiu, 2007, A new Dicranocentrus species (Collembola: Entomobryidae) from China with a key to all species in the genus from Asia, Zootaxa 1633, pp. 63-68 : 63-64

Key to the Asian Dicranocentrus species

1 Dental spines absent.....................................................................................................................................2

- Dental spines present..................................................................................................................................21

2 Abd. I without macrochaetae........................................................................................................................3

- Abd. I with macrochaetae.............................................................................................................................4

3 Seven macrochaetae in posterior group on dorsal head, abd. IV with 3 macrochaetae ................halophilus

- Four macrochaetae in posterior group on dorsal head, abd. IV with 2 macrochaetae .......................litoreus

4 Abd. I with 2 macrochaetae ............................................................................................................singularis

- Abd. I with more than 2 macrochaetae........................................................................................................5

5 Abd. I with 3 macrochaetae.........................................................................................................................6

- Abd. I with more than 3 macrochaetae......................................................................................................12

6 Tibiotarsi with smooth setae........................................................................................................................7

- Tibiotarsi without smooth setae...................................................................................................................8

7 Th. III with 9 macrochaetae ............................................................................................................ gemellus

- Th. III with 11 macrochaetae ................................................................................................... solomonensis

8 Head with S2 absent .......................................................................................................................nepalensis

- Head with S2 present....................................................................................................................................9

9 Tenent hair clavate.....................................................................................................................................10

- Tenent hair acuminate.................................................................................................................................11

10 Tibiotarsi pigmented ................................................................................................................ inermodentes

- Tibiotarsi unpigmented ...................................................................................................................... indicus

11 All labial setae smooth ..................................................................................................................... javanus

- Some labial setae ciliate and some smooth ................................................................................. salatiganus

12 Abd. I with 4 macrochaetae.......................................................................................................................13

- Abd. I with more than 4 macrochaetae......................................................................................................16

13 Th. III with 9 macrochaetae........................................................................................................................14

- Th. III with 10 macrochaetae.....................................................................................................................15

14 Abd. II with 2 macrochaetae .......................................................................................................... violaceus

- Abd. II with 3 macrochaetae .......................................................................................................... fasciatus

15 Abd. II with 2 macrochaetae ....................................................................................................... janetscheki

- Abd. II with 3 macrochaetae ........................................................................................................... fraternus

16 Abd. I with 5 macrochaetae.......................................................................................................................17

- Abd. I with 6 macrochaetae.......................................................................................................................18

17 Tenent hair clavate ........................................................................................................................... yoshiius

- Tenent hair lanceolate .................................................................................................................... lawrencei

18 Th. II with 10–11 setae..............................................................................................................................19

- Th. II with 13–14 setae ...................................................................................................................... pilosus

19 Abd. II with 2 macrochaetae .............................................................................................................. thaicus

- Abd. II with 3 macrochaetae.......................................................................................................................20

20 Th. III with 10 macrochaetae ........................................................................................................deharvengi

- Th. III with 11 macrochaetae ..........................................................................................................indecisus

21 Dental spines present on both inner and outer margins of dentes ...................................................spinosus

- Dental spines present only on inner margin of dentes................................................................................22

22 Sixth abdominal segment characteristically elongated in mature specimens, its length approaching that of fourth abdominal segment ................................................................................................................ cercifer

- Sixth abdominal segment not particularly elongated, never as long as fifth abdominal segment.............23

23 Abd. I with 2 macrochaetae ........................................................................................................... orientalis

- Abd. I with more than 2 macrochaetae......................................................................................................24

24 Abd. I with 3 macrochaetae.......................................................................................................................25

- Abd. I with more than 3 macrochaetae......................................................................................................27

25 Dental spines arranged in two rows ....................................................................................... problematicus

- Dental spines arranged in a single row......................................................................................................26

26 Unguiculus with inner and outer teeth .......................................................................................... luzonensis

- Unguiculus without tooth ....................................................................................................... wangi sp. nov.

27 Abd. I with 5 macrochaetae.......................................................................................................................28

- Abd. I with 6 macrochaetae ............................................................................................................... gapudi

28 Abd. III with 3 macrochaetae; Abd. IV with 4 macrochaetae ................................................... sundanensis

- Abd. III with 2 macrochaetae; Abd. IV with 6 macrochaetae ............................................................ chenae