Spinturnix, von Heyden, 1826

Orlova, Maria V. & Anisimov, Nikolay V., 2023, Three new species of bat-parasitic gamasid mites of the genera Spinturnix, Macronyssus and Steatonyssus (Acari: Mesostigmata: Spinturnicidae, Macronyssidae) from Siberia and Mongolia, with keys to species of Russia and adjacent countries, Persian Journal of Acarology 12 (2), pp. 211-239 : 215-216

Key to species of the genus Spinturnix of Russia and adjacent countries (females)

1. Sternal shield rounded, with one pair of setae ................................. Spinturnix senkevitchi sp. nov.

– Sternal shield drop-shaped or pentagonal, without setae or with three pairs of setae .................... 2

2. With 3–7 pairs of dorsal setae posterior to stigmata ...................................................................... 3

– With more than 20 dorsal setae posterior to stigmata .................................................................... 5

3. With 6–7 pairs of dorsal setae posterior to stigmata; lanceolate seta on dorsal tip of tarsi II–IV present ...................................................................................................... S. plecotina (Koch, 1839)

– With 3–4 pairs of dorsal setae; lanceolate seta on tarsi II–IV absent.............................................. 4

4. Two pairs of long setae and two pairs of short setae at the end of dorsal opisthosoma; tritosternum discoidal ............................................................................................. S. kolenatii Oudemans, 1910

– Three pairs of short setae on at the end of dorsal opisthosoma; tritosternum jar-shaped ................ .................................................................................................................... S. bakeri Rudnick, 1960

5. With less than 50 dorsal setae posterior to stigmata ...................................................................... 6

– With more than 50 dorsal setae posterior to stigmata .................................................................. 11

6. Tritosternum is large, mushroom-shaped; some dorsal setae of legs I–II serrated .......................... ....................................................................................................................... S. psi (Kolenati, 1856)

– Tritosternum not mushroom-shaped or small and difficult to observe; setae of legs I-II are smooth ......................................................................................................................................................... 7

7. With 40 or more dorsal setae .......................................................................................................... 8

– With less than 40 dorsal setae ........................................................................................................ 9

8. Sternal shield with a pattern of large-sized cells, with three pairs of setae; tritosternum difficult to observe ....................................................................................... S. bregetovae Stanyukovich, 1995

– Sternal shield with small reticulate pattern, lacking setae; tritosternum distinct, small and rounded ..................................................................... S. acuminata helvetiae Deunff, Keller & Aellen, 1986

9. Dorsal shield diamond-shaped, rounded; posterior margin of sternal shield rounded ..................... ............................................................................ S. nobleti Deunff, Volleth, Keller & Aellen, 1990

– Dorsal shield ovate; posterior margin of sternal shield almost straight ....................................... 10

10. Anterior and posterior ends of dorsal shield with a large rounded projection each; podosomal setae about two times shorter than opisthosomal setae..... S. acuminata acuminata (Koch, 1836)

– Dorsal shield with a single large anterior rounded projection, smoothly narrowed posteriorly; podosomal setae and opisthosomal seta subequal ........................ S. punctata (Sundevall, 1833)

11. Sternal shield pentagonal ...................................................... S. maedai Uchikawa & Wada, 1979

– Sternal shield drop-shaped ......................................................................................................... 12

12. Genital setae off genital shield; dorsal setae 90–130 ................................................................. 13

– Genital setae on genital shield; dorsal setae 70–90 .................................................................... 14

13. Dorsal opisthosomal setae 100–130, dorsal shield large (more than 800 µm) .............................. ................................................................................................................ S. myoti (Kolenati, 1856)

– Dorsal opisthosomal setae 80–100, dorsal shield small (less than 800 µm) .................................. ......................................................................... S. uchikawai Orlova, Zhigalin & Zhigalina, 2015

14. Marginal dorsal opisthosomal setae longer than other opisthosomal setae; tritosternum distinct ....................................................................................................... S. emarginata (Kolenati, 1856)

– Marginal dorsal opisthosomal setae subequal to other opisthosomal setae ................................... .......................................................................................................... S. mystacin (Kolenati, 1857)