Eustigmaeus

Khaustov, Alexander A. & Tolstikov, Andrei V., 2014, A new species and new records of the genus Eustigmaeus (Acari: Prostigmata: Stigmaeidae) from Western Siberia, Zootaxa 3861 (6), pp. 531-553 : 551-552

Key to species of the genus Eustigmaeus of Russia (females)

1. 1–2 pairs of callosities present between idiosomal and humeral plates........................................... 2

- Callosities absent..................................................................................... 4

2. Setae 4 a present, 2 pairs of callosities present.............................................................. 3

- Setae 4 a absent, 1 pair of callosities present....................................................... E. parvisetus

3. Distance between bases of setae d 1 – d 1 only slightly longer than distance c 1 – c 1, dorsal idiosomal plates almost smooth.............................................................................................. … E. rhodomela

- Distance between bases of setae d 1 – d 1 more than 2 times longer than distance c 1 – c 1, dorsal idiosomal plates with large lateral and small medial dimples............................................................ E. tjumeniensis sp. nov.

4. Eyes present........................................................................................ 5

- Eyes absent................................................................................ E. coronaria

5. Dorsal setae brush-shaped............................................................................. 6

- Dorsal setae of another shape........................................................................... 7

6. Femur IV with 4 setae...................................................................... E. anauniensis

- Femur IV with 5 setae......................................................................... E. plumifer

7. Dorsal setae clavate................................................................................... 8

- Dorsal setae saber-like or baculiform..................................................................... 9

8. Setae 4 a present, 3 pairs of aggenital setae.......................................................... E. clavata

- Setae 4 a absent, 2 pairs of aggenital setae....................................................... E. jiangxiensis

9. 1 or 3 pairs of aggenital setae present, dorsal setae saber-like................................................. 10

- 2 pairs of aggenital setae present, dorsal setae baculiform............................................. E. collarti

10. 3 pairs of aggenital setae present........................................................................ 11

- 1 pair of aggenital setae present................................................................... E. segnis

11. 3 pairs of pseudanal setae present............................................................. E. ioanninensis

- 4 pairs of pseudanal setae present................................................................. E. pinnata