Thalassaphorura Bagnall, 1949

Sun, Xin, Chen, Jian-Xiu & Deharveng, Louis, 2010, Six new species of Thalassaphorura (Collembola, Onychiuridae) from southern China, with a key to world species of the genus, Zootaxa 2627, pp. 20-38 : 22-24

Key to world species of the genus Thalassaphorura Bagnall, 1949

1 Th. I without pso, antennal base usually with 2 pso, PAO with more than 44 vesicles, large size (more than 3 mm). ....................................................................................................................................saccardyi ( Denis, 1935); Algeria

- Other combination of characters ................................................................................................................................. 2

2 Antennal base with 3 pso ............................................................................................................................................. 5

- Antennal base with 4 pso ............................................................................................................................................ 3

3 Head with 4+4 posterior pso, ventral tube chaetae as 1+1/7–8+7–8/2+2, AS equals 0.7 unguis ................................. ........................................................................... halophila ( Bagnall, 1937) sensu Fjellberg 1998; Northern Holarctic

- Head with 2+2 posterior pso, ventral tube chaetae less than above ............................................................................. 4

4 Ventral tube with 4+4 distal chaetae, AS absent, Th. I with 3+3 pso, AS absent........................................................... .......................................................................................................... hoguei ( Palacios-Vargas & Díaz, 1995); Mexico

- Ventral tube with 7+7 distal chaetae, AS present, Th. I with 2+2 pso, AS equals 0.8 unguis ....................................... ................................................................................................................................ tamurai ( Yue & Yin, 2000) ; China

5 AIIIO with 4 papillae................................................................................................................................................... 6

- AIIIO with 5 papillae................................................................................................................................................... 9

6 Dorsal pso formula 32/122/22332, AS present and small ............................... butrosi ( Christiansen, 1956); Lebanon

- Dorsal pso formula not as above, AS absent .............................................................................................................. 7

7 Dorsal pso formula 32/133/33333 .................................................................................. franzi ( Stach, 1946) ; Austria

- Dorsal pso formula 32/233/33343 ............................................................................................................................... 8

8 Ventral pso formula 11/000/01000, ventral tube chaetae as 0+0/6+6/1+1 ..................................................................... .................................... cryptopyga ( Denis 1931) sensu Najt & Weiner, 1997; Neotropics, Pacific islands, Indonesia

- Ventral pso formula 11/000/01120, ventral tube chaetae as 1+1/6+6/2+2 ..................................................................... ...............................................................................................................tovtrensis (Kaprus’ & Weiner, 1995); Ukraine

9 Th. I without pso........................................................................................................................................................ 10

- Th. I with pso ............................................................................................................................................................. 12

10 Head with 3+3 posterior pso, unguiculus with basal lamella, AS as long as unguis ..................................................... ............................................................................................ alborufescens (Vogler, 1895) sensu Gisin (1957); Europe

- Head with 2+2 posterior pso, unguiculus without basal lamella ............................................................................... 11

11 Abd. I–III with 2+2 pso, vesicle number of PAO as 20–22, AS equals 0.9 unguis ....................................................... ......................................................................................................................... bagnalli ( Salmon, 1959); Great Britain

- Abd. I–III with 3+3 pso, vesicle number of PAO as 30–38, AS equals 0.7 unguis ....................................................... ...................................................................................................................... kirgisica ( Martynova, 1971); Kirghizstan

12 Th. I with 1+1 pso...................................................................................................................................................... 13

- Th. I with 2+2 pso...................................................................................................................................................... 19

13 Dorsal pso formula 32/11(3)1(2)/22(3)2(3)2(3)3, AS equals 0.9 unguis ....................................................................... ....................................................................................... moniezi (Bagnall, 1935) sensu Salmon (1959); Great Britain

- Dorsal pso formula not as above................................................................................................................................ 14

14 Th. II–III with 2+2 pso each ....................................................................................................................................... 15

- Th. II–III with 3+3 pso each ...................................................................................................................................... 16

15 Ventral pso formula 11/000/01000, ventral tube chaetae as 1+1/6+6/1+1, subcoxa 1 of legs I, II and III with 1, 1 and 1 pso respectively, AS equals 0.2–0.25 unguis ........................................................................ reducta sp. nov.; China

- Ventral pso formula 11/000/01010, ventral tube chaetae as 0+0/6+6/1+1, subcoxa 1 of legs I, II and III with 2, 2 and 2 pso respectively, AS equals 0.4 unguis .................................................................................... bapen sp. nov.; China

16 Ventral side of abdomen without pso, AS equals 0.7 unguis.......... thalassophila ( Bagnall, 1937) ; Northern Europe 1

- Ventral side of abdomen with pso.............................................................................................................................. 17

17 Dorsal pso formula on Abd. I– V 33334 , ventral pso formula 0 1120, subcoxa 1 of legs I, II and III with 1, 1 and 1 pso respectively, AS equals 0.3 unguis, d0 absent .............................. jailolonis ( Yoshii & Suhardjono, 1992) ; Indonesia

- Dorsal pso formula on Abd. I–V not as above; subcoxa 1 of legs I, II and III with 2, 2 and 2 pso respectively ..... 18

18 Chaetae on ventral tube as 1+1/7+7(8)/2+2, dorsal pso formula on Abd. I–V 333(4)5(4)4(3), ventral pso formula 0111(2)0, AS equals 0.5 unguis ................... debilis (Moniez, 1890) ; Western and northern Europe, littoral species 1

- Chaetae on ventral tube as 0+0/6+6/2+2, dorsal pso formula on Abd. I– V 33343 , ventral pso formula 0 1110, AS equals 0.75 unguis ..................................................................................... grandis sp. nov.; China, forest soil species

19 Dorsal pso formula 32/233/33343 .............................................................................................................................. 20

- Dorsal pso formula not as above ............................................................................................................................... 31

20 Distal whorl of tibiotarsi with 7 chaetae ..................................................................................................................... 21

- Distal whorl of tibiotarsi with 9 chaetae ................................................................................................................... 23

21 Dorsal S-chaetae on head 2+2 ................................................................................................................................... 22

- Dorsal S-chaetae on head 1+1, AS as long as unguis..................................................................................................... ................................................................................... petaloides ( Rusek, 1981) ; Irak, New Caledonia, Hawaii, China

22 Unguiculus very small, less than 5 times the length of inner edge of unguis, ventral side of head with 1+1 pso, AS equals 0.9 unguis............................................................................................. thaibinhensis ( Nguyen, 2001); Vietnam

- Unguiculus equals 0.5 inner edge of unguis, with basal lamella, ventral side of head with 2+2 pso, AS equals 0.7 unguis ............................................................................................................................... tibiotarsalis sp. nov.; China

23 Ventral pso formula 11/000/01110 ............................................................................................................................ 24

- Ventral pso formula 11/000/01120 or 11/000/11120.................................................................................................. 25

24 Th. I with 7+7 chaetae, length 1.4 mm ........................................................................................................................... ............................. duplopunctata (Strenzke, 1954) sensu Fjellberg 1998 ; Northern Holarctic, mostly littoral species

- Th. I with 5+5 chaetae, AS equals 0.2 unguis, length 0.8–1.1 mm ....... pomorskii sp. nov.; China, forest soil species

25 Ventral pso formula 11/000/11120, dorsal S-chaetae on head 1+1, AS as long as unguis, unguiculus equals 0.7 inner edge of unguis, without basal lamella................................................................ kwona ( Thibaud & Lee, 1994); Korea

- Ventral pso formula 11/000/01120............................................................................................................................. 26

26 4+4 chaetae between two posterior inner pso on head, chaetae on ventral tube as 1+1/6+6/2+2, AS equals 0.5 unguis .................................................................................................. lifouensis ( Thibaud & Weiner, 1997); New Caledonia

- 3+3 chaetae between two posterior inner pso on head ............................................................................................... 27

27 PAO with about 10–13 vesicles, dorsal S-chaetae formula 2/011/11101, unguiculus without basal lamella, as long as unguis, ventral tube chaetae as 1+1/5+5/2+2, Th. I with 6+6 (7+7) chaetae, AS equals 0.4 unguis.............................. ........................................................................................................................................ tenuis Babenko, 2007; Russia

- PAO with more than 20 vesicles................................................................................................................................. 28

28 Th. I with 5+5 chaetae, unguiculus with basal lamella............................................................................................... 29

- Th. I with more than 5+5 chaetae, unguiculus without basal lamella, AS equals 0.8 unguis .................................... 30

29 Unguiculus equals 0.75 inner edge of unguis, S-chaetae not differentiated, AS equals 0.7 unguis, Abd. VI with one axial chaeta dorsally (m0) ............................................... zschokkei ( Handschin, 1919) sensu Pomorski, 1998; Europe

- Unguiculus equals 0.5 inner edge of unguis, S-chaetae differentiated, AS equals unguis, Abd. VI with two axial chaetae dorsally (a0 and m0) ....................................................................................................... tiani sp. nov.; China

30 Chaetae on ventral tube as 0+0/6–7+6–7/0+0, labial type AC, labial proximal chaetae as 7, male ventral organ pres- ent................................................................................................................. qixiaensis Yan, Shi & Chen, 2006 ; China

- Chaetae on ventral tube as 1+1/6–7+6–7/1+1 (2+2), labial type A, labial proximal chaetae as 6, strictly parthenoge- netic ............................................................................... encarpata ( Denis, 1931) sensu Fjellberg 1998; Cosmopolitan

31 Dorsal pso formula 32/233/33333 ............................................................................................................................. 32

- Dorsal pso formula not as above................................................................................................................................ 35

32 PAO with about 45 vesicles, AS equals 0.4 unguis ....................................................... ishikawai ( Yosii, 1956); Japan

- PAO with less than 40 vesicles ................................................................................................................................. 33

33 Unguiculus with basal lamella, PAO with about 25 vesicles, AS equals 0.7 unguis...................................................... ............................................................................................................................. guineaensis ( Salmon, 1965); Guinea

- Unguiculus without basal lamella.............................................................................................................................. 34

34 Ventral pso formula 11/000/11200, chaetae on ventral tube as 1+1/6+6/2+2 ................................................................ ...................................................................................................................... yodai ( Yosii, 1966) ; Nepal, China, Japan

- Ventral pso formula 1/000/11120, chaetae on ventral tube as 0+0/6+6/2+2 ........ yolandae ( Izarra, 1971); Venezuela

35 Dorsal pso formula 32/2(1)33/333(4)5(4)4(3), ventral pso formula 11/000/0111(2)0, chaetae on ventral tube as 1+1/ 7+7(8)/2+2, AS equals 0.5 unguis ............................................................. debilis (Moniez, 1890) ; Northern Europe1

- Dorsal and ventral pso formula not as above ............................................................................................................. 36

36 Dorsal pso formula 32/233/3333(4)2, ventral pso formula 11/000/00010, chaetae on ventral tube as “9–10+9–10” according to original description, AS equals 0.5 unguis .............................................. orientalis ( Stach, 1964) ; China

- Dorsal pso formula 32/233/33342, ventral pso formula 1/111/00000, chaetae on ventral tube as 1+1/6+6/1+1, AS equals about 0.7 unguis .............................................................................................. ghatensis ( Prabhoo, 1971); India