Thrips, Linnaeus, 1758

Masumoto, Masami & Okajima, Shûji, 2019, Three new species of the genus Thrips (Thysanoptera, Thripidae) in Japan, Zootaxa 4614 (3), pp. 575-584 : 576-577

Key to Japanese species of Thrips

1. Abdominal sternites with discal setae..................................................................... 2

-. Abdominal sternites without discal setae.................................................................. 19

2. Abdominal sternite VII with discal setae................................................................... 3

-. Abdominal sternite VII without discal setae............................................................... 16

3. Pleurotergites with discal setae........................................................................... 4

-. Pleurotergites without discal setae........................................................................ 7

4. Fore wing first vein with 6–9 distal setae; abdominal tergite VIII with posteromarginal comb complete, microtrichia developed..................................................................................... minutissimus

-. Fore wing first vein with 3 distal setae; abdominal tergite VIII without posteromarginal comb medially, or no developed microtrichia.............................................................................................. 5

5. Body dark; antennae 8-segmented; abdominal sternites III–VI with 3 pairs of posteromarginal setae; metascutum sculptured longitudinally;.................................................................................. alliorum

-. Body pale; antennae 7-segmented; abdominal sternites III–VI with 6 or more pairs of posteromarginal setae; metascutum reticulate longitudinally at middle;......................................................................... 6

6. Pronotum with 2 pairs of posteroangular setae...................................................... subnudula

-. Pronotum with no long setae....................................................................... aspinus

7. Antennae 8-segmented; fore wing first vein often with more than 3 setae on distal half; abdominal tergite VIII with posteromarginal comb rarely lacking at middle....................................................................... 8

-. Antennae 7-segmented; fore wing first vein with 3 setae on distal half; abdominal tergite VIII with posteromarginal comb complete.............................................................................................. 11

8. Metascutum sculptured with longitudinal striae, median pair of setae arising from anterior margin; ocellar setae III lateral to fore ocellus.......................................................................................... 9

-. Metascutum reticulate, no longitudinal striae medially, median pair of setae behind anterior margin; ocellar setae III posterolateral to fore ocellus................................................................................... 10

9. Abdominal tergite VIII with posteromarginal comb complete, but microtrichia short and slightly irregular; fore wing first vein always with 3 distal setae; male pale...................................................... hawaiiensis (in part)

-. Abdominal tergite VIII without posteromarginal comb medially; fore wing first vein often with more than 3 distal setae; male dark......................................................................................... vitticornis

10. Fore wing first vein with 6–9 distal setae; metascutum with reticulations having internal wrinkles, CPS absent; pleurotergites with ciliate microtrichia........................................................................... simplex

-. Fore wing first vein with 3 distal setae; metascutum with ill-formed reticulations having no internal wrinkles, CPS present; pleurotergites without ciliate microtrichia............................................................... pini

11 Pronotum with 1 pair of posteroangular setae; body uniformly yellow................................ unisetifer sp. n.

-. Pronotum with 2 pairs of posteroangular setae; body not uniformly yellow....................................... 12 with base pale....................................................................................... 13 -. Metascutum without CPS; ocellar setae III posterolateral to fore ocellus; abdominal tergite II with 3 lateral marginal setae; fore wing uniformly dark.................................................................................. 15

13. Metascutum with median pair of setae at anterior margin............................................. hawaiiensis

-. Metascutum with median pair of setae behind anterior margin................................................. 14

14. Abdominal sternite VII with S1 setae in front of posterior margin; body bicolored, abdominal tergites I-VII dark on median third; male pale................................................................................ coloratus

-. Abdominal sternite VII with S1 setae at posterior margin; body uniformly dark; male dark................ ogasawarensis

15. Abdominal tergite X less than 65 μm long (usually 58 μm) long; X1 +2 X2 + X3 (X1 =pronotal posteroangular setae I length, X2 =S3 setae length on tergum IX, X3 =tergite X length) usually 303–353 (range 286–390); male pale............. griseus

-. Abdominal tergite X more than 70 μm long (usually 76 μm); X1 +2 X2 + X3 usually 397–425 (range 385–438); male dark................................................................................................. trehernei

16. Fore wing banded, with a pale band at distal four-thirds; metascutum irregularly reticulate; abdominal tergite VIII with posteromarginal comb complete; pleurotergites with discal setae..................................................... 17

-. Fore wing uniformly dark at distal four-thirds; metascutum polygonally reticulate; abdominal tergite VIII without posteromarginal comb medially; pleurotergites without discal setae...................................................... 18

17 Metascutum with CPS; antennal segment VI with 9 setae................................................ syringae

-. Metascutum without CPS; antennal segment VI with 10 setae............................................ nonakai

18. Fore wing uniformly dark, first vein without long gap in setal row................................. orientalis (in part)

-. Fore wing pale at base, first vein with long gap in setal row, 3 distal setae........................ extensicornis (in part)

19. Metascutum with polygonal reticulation; abdominal tergite VIII without posteromarginal comb medially............... 20

-. Metascutum with longitudinal sculpture or irregular reticulation, no polygonal reticulation; abdominal tergite VIII with posteromarginal comb medially, microtrichia usually developed.................................................. 22

20. Fore wing first vein with 3 distal setae........................................................... extensicornis

-. Fore wing first vein with setal row almost complete......................................................... 21

21. Fore wing uniformly dark; metascutum without CPS.................................................. orientalis

-. Fore wing pale at base; metascutum usually with CPS................................................... malloti

22. Pleurotergites with discal setae.......................................................................... 23

-. Pleurotergites without discal setae....................................................................... 26

23. Body uniformly yellow, with no brown markings.................................................... brevicornis

-. Body brown........................................................................................ 24

24. Fore wing uniformly pale or slightly shaded; all legs yellow, never dark..................................... typicus

-. Fore wing dark with base pale; at least mid and hind femora usually dark........................................ 25

25. Antennal segment VII 2.3–3.0 times as long as wide, segment VI with 12 setae; tibiae pale; in male body pale, antennal segment VI with almost same number of setae as in female...................................................... setosus

-. Antennal segment VII less than 2. 0 times as long as wide, segment VI with 10 setae; tibiae dark; in male body dark, antennal segment VI with more than 20 setae............................................................... brunneus

26. Abdominal tergite IX with 1 pair of CPS.................................................................. 27

-. Abdominal tergite IX with 2 pairs of CPS................................................................. 29

27. Metascutum with CPS; abdominal tergite II with 4 lateral marginal setae.................................... urticae

-. Metascutum without CPS; abdominal tergite II with 3 lateral marginal setae...................................... 28

28. Fore wing first vein with 4–6 distal setae; pleurotergites with ciliate microtrichia; abdominal tergites smooth medially; compound eyes without pigmented facets ventrally; both sexes always macropterous............................... tabaci

-. Fore wing first vein with 3 distal setae; pleurotergites without ciliate microtrichia; compound eyes with 5 pigmented facets ventrally; abdominal tergites sculptured medially; wing length various, macropterous to micropterous, male always micropterous........................................................................................ nigropilosus

29. Body uniformly yellow; abdominal tergite II with 3 lateral marginal setae; fore wing pale with brown band at middle and extreme base;................................................................................ rhamni sp. n.

-. Body dark or pale; abdominal tergite II with 4 lateral marginal setae; fore wing uniformly pale or dark at distal four-fifths, never banded;............................................................................................ 30

30. Fore wing dark except base, not uniformly pale; body dark; antennae 7-segmented................................ 31

-. Fore wing uniformly pale; body yellow; antennae rarely 8-segmented........................................... 32

31. Abdominal sternite VII usually with 2 pairs of posteromarginal setae; metascutum with reticulations medially.. shiranesanus

-. Abdominal sternite VII with 3 pairs of posteromarginal setae; metascutum with closely spaced longitudinal sculpture. floreus

32. Ocellar setae III within ocellar triangle, just behind fore ocellus; antennae 7- or 8-segmented..................... flavus

-. Ocellar setae III outside or at anterior margin of ocellar triangle; antennae 7-segmented............................. 33

33. Mouth-cone long and pointed at apex, reaching to mesothorax; antennal segment VI pale at base................... sukki

-. Mouth-cone not pointed, not reaching to mesothorax; antennal segment VI not pale................................ 34

34. Head prolonged anteriorly; metascutal sculpture not longitudinal at middle; abdominal tergites sculptured throughout, tergites II–VIII with S1 setae subequal to S2 setae, tergite II with accessary setae mesad of setal row, tergite VIII with complete but short irregular posteromarginal comb......................................................... shiranensis sp. n.