Euseius, Wainstein, 1962

Kar, Anamika & Karmakar, Krishna, 2021, Description of eleven new species of phytoseiid mites (Acari: Mesostigmata) from Meghalaya state, north eastern India, Zootaxa 5068 (3), pp. 301-354 : 318-319

Key to the Indian species of Euseius described or reported from India.

1. All the dorsal setae shorter except j1 and Z5 ................................................................ 2

- Besides j1 and Z5 some other setae longer.................................................................. 5

2. All the macrosetae of leg IV spatulated.......................................... E. macrospatulatus ( Gupta, 1986)

- All the macrosetae of leg IV not spatulated................................................................. 3

3. Z5 barbed............................................................... E. vikrami Karmakar & Gupta, 2014

- Z5 smooth........................................................................................... 4

4. Spermatheca short, tubular, flared at atrium............................................... E. ovalis ( Evans, 1953) - Spermatheca elongated, tubular, not flared at atrium............................... E. sacchari ( Ghai & Menon, 1967)

5. Ventrianal shield vase-shaped, no forward migration of JV2 and ZV2 ............................................ 6

- Ventrianal shield pentagonal with forward migration of JV2 and ZV2 ........................................... 10

6. Spermatheca bell-shaped.................................................... E. chikmagalurensis ( Gupta, 1986)

- Spermatheca tubular-shaped............................................................................. 7

7. Setae j1, j3 and Z4 same in length, macrosetae present on genu, tibia and tarsus.................................... 8

- Setae j3 longer than j1 and Z4, macrosetae present only on tarsus............................................... 9

8. All the lateral setae long j3 40–45, z2 35–40, z4 45–51, s4 60 –65, Z1 31–32, S2 35, S4 27 –29, S5 36 –40, Z4 31–34, Z5 67–72........................................................................ E. scutalis ( Athias-Henriot, 1958) .

- All the lateral setae shorter, j3 32–36, z2 15–17, z4 19–24, s4 29 –47, Z1 10–14, S2 11 –14, S4 12 –18, S5 13 –16, Z4 10–13, Z5 56–60........................................................................... E. concordis Chant, 1959

9. Peritreme extended beyond j3, single pair of metapodal shields.......................... E. chitradurgae ( Gupta, 1986)

- Peritreme extended up to the base of z2, two pairs of metapodal shields................ E. kalimpongensis ( Gupta, 1969c)

10. Dorsum reticulated................................................................................... 11

- Dorsum smooth..................................................................................... 25

11. Seta j1 longer than j3................................................................................. 12

- Seta j1 shorter or equal to j3 ............................................................................ 13

12. Sternal shield longer than wide................................................ E. papayensis ( Sadanandan, 2006)

- Sternal shield as long as wide.................................................. E. rhododendronis ( Gupta, 1970 a)

13. Seta s4, S4 and S5 serrated.................................................. E. sativum Karmakar & Gupta, 2014

- Seta s4, S4 and S5 not serrated.......................................................................... 14

14. Calyx annulated or constricted.......................................................................... 15

- Calyx not annulated.................................................................................. 18

15. R1 on the dorsal shield......................................... E. bandispermathecae Pramanik & Karmakar, 2016

- R1 off the dorsal shield................................................................................ 16

16. Tip of macrosetae blunt, atrium indistinct.................................. E. astrictus Karmakar & Bhowmik, 2018

- Tip of macrosetae pointed, atrium distinct................................................................. 17

17. Calyx tubular, annulated at the base of vesicle and flared at atrium................................. E. fascae sp. nov.

- Calyx tubular, annulated and narrow at atrium................................. E. prasadi Chant & McMurtry, 2005 c

18. Calyx of spermatheca constricted at base and flared at atrium................................................. 19

- Calyx of spermatheca not constricted at base and not flared at atrium........................................... 22

19. R1 on the dorsal shield................................................................ E. dwakiensis sp. nov.

- R1 off the dorsal shield................................................................................ 20

20. Leg macrosetae with hyaline tip........................................... E. sajnekhalicus Kar & Karmakar, 2021

- Leg macrosetae without hyaline tip...................................................................... 21

21. z4 longer than z2 ....................................................... E. coccosocius ( Ghai & Menon, 1967)

– z4 not longer than z2.......................................................... E. finlandicus ( Oudemans, 1915)

22. z4 always reaches the base of s4 ...................................................... E. alstoniae ( Gupta, 1975)

- z4 never reaches the base of s4 .......................................................................... 23

23. Z5 serrated..................................................... E. arunachalensis Pramanik & Karmakar, 2016

- Z5 smooth.......................................................................................... 24

24. Macrosetae of leg IV capitate, movable digit toothless..................................... E. coccinae Gupta, 1975

- Macrosetae of leg IV not capitate, movable digit with teeth.............. E. sundarbanensis Karmakar & Bhowmik, 2018

25. z2 always reaches the base of z4 ........................................................................ 26

- z2 never reaches the base of z4 .......................................................................... 27

26. All lateral setae long, S4 always reaches base of S5.................................. E. vignus Rishi & Rather, 1983

- All lateral setae not long, S4 never reaches base of S5 ........................... E. mangiferae ( Ghai & Menon, 1967)

27. R1 on the dorsal shield............................................................ E. ahaioensis ( Gupta, 1992)

- R1 off the dorsal shield................................................................................ 28

28. s4 longer than j1 ........................................................... E. eucalypti ( Ghai & Menon, 1967)

- s4 shorter or equal to the length of j1 ..................................................................... 29

29. j1 longer than j3 ..................................................................................... 30

- j1 shorter or equal length of j3 ............................................... E. bambusae ( Ghai & Menon, 1967)

30. Ventrianal shield triangular, 60 long, 40 wide at ZV2 ................................ E. neococcineae ( Gupta, 1978c) .

- Ventrianal shield pentagonal, 100–105 long, 45–50 wide at ZV2................ E. bomdilae Pramanik & Karmakar, 2016