Key to species of Austrophthiracarus known from China

1 Notogaster with 17 pairs of setae; c 1> c 1 – d 1 ................................................................. 2

- Notogaster with 16 pairs of setae; c 1 <c 1 – d 1 ................................................................. 3

2 Sensilli bacilliform with thin and smooth head; lamellar setae thick, flagellate distally and strongly curved inward in distal half; setae d of femora I situated near distal end of article................................ A. longisetosus Liu & Chen, 2014

- Sensilli setiform, tapering distally; lamellar setae thin, spiniform but not curved inward in distal half; setae d of femora I situated far from distal end of segment................................................. A. paralongisetosus sp. nov.

3 Interlamellar setae long and thick; sensilli bacilliform, nearly equally thick in whole length; vestigial setae f 1 anterior to setae h 1 ................................................................................ A. bacilliformis sp. nov.

- Interlamellar setae short and fine; sensilli setiform, tapering distally; vestigial setae f 1 posterior to setae h 1 ............... 4

4 Lateral carinae of prodorsum absent; lamellar setae thick; exobothridial setae vestigial; formula of genital setae 7(4+3): 2..................................................................................... A. setiformis Liu, 2017

- Lateral carinae of prodorsum present; lamellar setae fine; exobothridial setae not vestigial; formula of genital setae 6(4+2): 3........................................................................... A. filiformis Liu & Chen, 2014