Key to the Tullbergiidae species from Xinjiang Province, China

1 PAO with 6–7 vesicles in two rows............................... Wankeliella intermedia Potapov & Stebaeva, 1997

- PAO with numerous vesicles............................................................................ 2

2 PAO broad, with 48–52 simple vesicles lying in 4 rows................................. Multivesicula zhengi sp. nov.

- PAO elongated, with 18–68 vesicles lying in 2 rows.......................................................... 3

3 Pseudocelli only of type I (star-like); Asp small, shorter than claws; body length 0.4–0.6 mm ......................... 4

- Pseudocelli of type IV (convergently striate), especially at the antennal base; Asp stronger, longer than claws; body length 0.8–1.16 mm ...................................................... Paratullbergia qilianensis Bu & Gao, 2019

4 PAO narrow, with 30 vesicles in two rows; sensory seta p3 on Abd. V slim........... Mesaphorura pacifica Rusek, 1976

- PAO extended, with 26–36 vesicles in two tows; sensory seta p3 on Abd. V spindle-like............................. 5

5 Pseudocelli on Th. II and III situated between setae m5 and p5; Abd. IV with setae m4 and m5; Abd. V with 2+2 setae between seat a4 (a2 absent)........................................................... Mesaphorura critica Ellis, 1976

- Pseudocelli on Th. II and III behind seta p4; Abd. IV without m-setae; Abd V with 3+3 setae between seat a4 (a2 present)............................................................................ Mesaphorura yosii (Rusek, 1967)