Pseudotyrannochthoniidae, Beier, 1932

Yun-Chun LI, 2023, Three new species of pseudoscorpions (Arachnida: Pseudoscorpiones: Pseudotyrannochthoniidae) from caves in Yunnan and Guizhou Provinces, China, European Journal of Taxonomy 861, pp. 48-64 : 60-61

Identification key to the family of Pseudotyrannochthoniidae from China

1. Coxal spines on a common protuberance .......................................................................................... 2

– Coxal spines never on a common protuberance .............................................................................. 12

2. Carapace with eyes ............................................................................................................................ 3

– Carapace without eyes or eyespots ................................. Allochthonius brevitus Hu & Zhang, 2012

3. Carapace anterior margin with 8 setae............................................................................................... 4

– Carapace anterior margin with 10 setae............................................................................................. 7

4. Rallum with 11 pinnate blades........................................................................................................... 5

– Rallum only with 8 pinnate blades ......................... Allochthonius sichuanensis (Schawaller, 1995)

5. Carapace without lyrifissures; movable chelicera finger most with 14 conspicuous teeth................ 6

– Carapace with 2 pairs of lyrifissures; movable chelicera finger with 20 conspicuous teeth ............... ................................................................... Allochthonius fanjingshan Gao, Zhang & Zhang, 2016

6. Fixed chelicera finger with 6 teeth; palpal femur 5.30–5.50 × as long as broad (length 1.05– 1.22 mm)............................................................................ Allochthonius fuscus Hu & Zhang, 2011

– Fixed chelicera finger with 5 teeth; palpal femur 6.10–7.20 × as long as broad (length 1.36– 1.40 mm)................................................................................. Allochthonius wui Hu & Zhang, 2011

7. Carapace anterior margin without protuberances .............................................................................. 8

– Carapace anterior margin with 27 triangular protuberances................................................................ ........................................................................................ Allochthonius trigonus Hu & Zhang, 2011

8. Chelicera hand with 6 setae ............................................................................................................... 9

– Chelicera hand with 7 setae ..............................................................................................................11

9. Rallum with 10 pinnate blades ........................................................................................................ 10

– Rallum with 12 pinnate blades .............................. Allochthonius liaoningensis Hu & Zhang, 2012

10. Fixed chelicera finger with 5–6 teeth; coxal spine with a spray of 4–5 clavate blades....................... .............................................................................. Allochthonius jingyuanus Zhang & Zhang, 2014

– Fixed chelicera finger with 4 teeth; coxal spine with a spray of 7–8 clavate blades........................... ................................................................................... Allochthonius exornatus Gao & Zhang, 2013

11. Fixed finger with 5 teeth; rallum; the apical-most one without small branches at the bend........................................................................................................... Allochthonius lini sp. nov.

– Fixed finger with 4 teeth; rallum; the apical-most one with 3 small branches at the bend........................................................................................................ Allochthonius xuae sp. nov.

12. Carapace with eyes; coxal spine with a spray of 4–5 clavate blades............................................... 13

– Carapace without eyes or eyespots; coxal spine with a spray of 7–8 clavate blades .......................... ........................................................................................................ Spelaeochthonius yinae sp. nov.

13. Carapace with three pairs of lyrifissures; female chela length 1.21 mm ............................................. ....................................................................... Centrochthonius cheni ( Gao, Zhang & Zhang, 2016)

– Carapace without lyrifissures; female chela length 1.71 mm .............................................................. ..................................................................................... Centrochthonius kozlovi (Redikorzev, 1918)