Mycterothrips

Okajima, Masami Masumoto And Shûji, 2006, A revision of and key to the world species of Mycterothrips Trybom (Thysanoptera, Thripidae), Zootaxa 1261 (1261), pp. 1-90 : 13-18

Key to world species of Mycterothrips

1. Female. ................................................................................................................... 2

­. Male. .................................................................................................................... 28

2 (1) Abdominal sterna with discal setae in addition to posteromarginal setae (cf. Figs. 9, 44–45)................................................................................................................. 3

­. Abdominal sterna with posteromarginal setae only ( Fig. 124). ............................ 7

3 (2) Abdominal terga without ciliate microtrichia along lines of sculpture; sterna III– VII with one pair of discal setae ................................................................. auratus

­. Abdominal terga with numerous ciliate microtrichia along lines of sculpture laterally ( Figs. 5, 7, 43, 130); sterna usually with more than one pair of discal setae... 4

4 (3) Head distinctly smaller than pronotum; mouth­cone very long and slender, reaching to mesosternum ( Fig. 1); abdominal tergum IX with a few microtrichia on posterior margin at middle ( Fig. 7) .............................................................................. 5

­. Head not distinctly smaller than pronotum ( Fig. 126); mouth­cone not long and slender, not reaching to mesothorax; abdominal tergum IX without microtrichia on posterior margin...................................................................................................... 6

5 (4) Mesonotum with median pair of setae situated far from posterior margin ( Fig. 4); antennal segment II without microtrichial rows on dorsal surface; abdominal terga VII and VIII with B4 setae minute ( Fig. 6), sterna III–VII with six setae on posterior margin and many discal setae in a transverse row medially ( Fig. 9).... acaciae

­. Mesonotum with median pair of setae situated near posterior margin; antennal segment II with microtrichial rows on dorsal surface ( Fig. 95); abdominal tergum VII with B4 setae not minute ( Fig. 96), sterna III–VII with discal setae in irregular row medially and with some discal setae on posterior margin in addition to six posteromarginal setae ( Fig. 97) ................................................................ laticauda

6 (4) Fore wings pale with subapical and subbasal darker bands ( Fig. 129); abdominal sterna III–VII with 6 setae on posterior margin and more than 10 discal setae in irregular row medially ( Fig. 131) ......................................................... setiventris

­. Fore wings without darker bands, uniformly slightly shaded; abdominal sterna III– VI with 9–11 setae on posterior margin and a few discal setae near posterior margin ( Fig. 44) ....................................................................................... chaetogastra

7 (2) Abdominal terga II–VIII and laterotergites with numerous ciliate microtrichia along lines of sculpture laterally, microtrichia uniform and regular on all segments ( Figs. 81–82, 93, 112, 138–139)............................................................................. 8

­. Abdominal terga (and often laterotergites also) without ciliate microtrichia along lines of sculpture, when present microtrichia are either irregular or small dentate, or microtrichia ciliate but not uniform and usually on posterior segments only ( Figs. 28–30, 31, 37–38, 53, 150–151) ............................................................... 12

8 (7) Ocellar setae I, often also II, absent ( Fig. 92). [white species.]..... imbimbiachetae

­. Ocellar setae I and II present (cf. Fig. 78). ............................................................. 9

9 (8) Abdominal tergum II with three lateral marginal setae, tergum IX with posterior pair of CPS only ( Fig. 139); antennae usually 7­segmented, terminal style sometimes weakly or incompletely divided ( Fig. 135)......................... shihoae sp. nov.

­. Abdominal tergum II with four lateral marginal setae ( Figs. 81, 112), tergum IX with both anterior and posterior pairs of CPS ( Fig. 82); antennae 8­segmented, terminal style distinctly two segmented (cf. Fig. 79) ............................................... 10

10 (9) Antennal segment VI longer than IV ( Fig. 79), III sharply pale at basal third, IV often pale at base ....................................................................................... glycines

­. Antennal segment VI shorter than IV (cf. Figs. 58, 104–105), III not sharply pale at basal third, IV usually not pale at base ............................................................ 11

11 (10) Mouth­cone relatively slender, 1.3–1.5 times as long as dorsal length of head, straight at each side ( Figs. 110, 114–117); antennal segment I usually more or less shaded, often brown, III and VI with or without weak neck at distal third ( Figs. 104–105, 107–109); B4 setae on abdominal tergum VI usually minute ................. ............................................................................................................... nilgiriensis

­. Mouth­cone wider and shorter, almost as long as dorsal length of head, slightly rounded at each side ( Fig. 56); antennal segment I yellow, never shaded, III and VI with distinct neck at distal third ( Fig. 58); B4 setae on abdominal tergum VI not minute ( Fig. 57)............................................................................. desleyae sp. nov.

12 (7) Ocellar setae I or II absent (only one pair of anteocellar setae) ( Figs. 14, 87)..... 13

­. Ocellar seta I and II present (two pairs of anteocellar setae) (cf. Fig. 10). .......... 14

13 (12) Antennal segment II without mid­dorsal seta below CPS ( Fig. 88); ocellar setae I absent ( Fig. 87); abdominal tergum II with four lateral marginal setae ( Fig. 90). [large yellow species.] .................................................................... grandis sp. nov.

­. Antennal segment II with a mid­dorsal seta below CPS ( Fig. 15); ocellar setae II absent ( Fig. 14); abdominal tergum II with three lateral marginal setae. [medium sized brown to dark brown species.] ................................................... annulicornis

14 (12) Postocular setae III distinctly stouter and longer than other setae, more than half length of ocellar setae III ( Fig. 98); metathoracic spinula weakly developed or reduced............................................................................................................. latus

­. Postocular setae III not as above, not distinctly stouter and longer than other setae (cf. Figs. 21–22); metathoracic spinula well developed ....................................... 15

15 (14) Fore wings banded, not uniformly shaded in distal three­quarters....................... 16

­. Fore wings not banded, uniformly shaded or pale in distal three­quarters........... 17

16 (15) Fore wings dark at middle and apex, pale at subbasal and subdistal areas ( Fig. 73); pronotum with one pair of anteromarginal setae much longer than discal setae ( Fig. 70); mesonotum with narrow­spaced lines of sculpture ( Fig. 72) ................... ...................................................................................................... fasciatus sp. nov.

­. Fore wings pale at basal fourth and extreme apex, with a wide shaded area between these two pale areas; pronotum without anteromarginal setae longer than discal setae; mesonotum without narrow­spaced lines of sculpture......................... ........................................................................................................ caudibrunneus

17 (15) Abdominal tergum II with three lateral marginal setae ........................................ 18

­. Abdominal tergum II with four lateral marginal setae.......................................... 21

18 (17) Mesonotum with a pair of CPS anteromedially. ................................................... 19

­. Mesonotum without a pair of CPS anteromedially ( Figs. 12, 145). ..................... 20

19 (18) Body yellowish brown or brownish yellow; antennal segment I pale, II–VIII pale brown to brown although III slightly paler................................................... aureus

­. Body uniformly yellowish white; antennal segments I–II pale, III and IV pale in basal half......................................................................................................... albus

20 (18) Forked sense­cones of antennal segments III and IV about 1.4 times as long as length of V, III 2.8–3.0 as long as width and slightly shaded at apex, V about twice as long as width, VI with 12–16 setae ( Fig. 143) ................................. tschirkunae

­. Forked sense­cones of antennal segments III and IV almost as long as length of V, III 2.1–2.3 as long as width and uniformly pale, V 1.5–1.6 times as long as width, VI with 9–10 setae ( Fig. 11) ................................................................. albidicornis

21 (17) Abdominal tergum IX without CPS; body uniformly yellowish white.......... ricini

­. Abdominal tergum IX with CPS; body yellowish brown to dark brown, at least not uniformly yellowish white.................................................................................... 22

22 (21) Antennal segments I –VIII uniformly dark brown. .............................................. 23

­. Antennal segments I–VIII not uniformly dark brown, at least III yellow or sharply bicoloured ............................................................................................................. 24

23 (22) Abdominal tergum IX with posterior pair of CPS only ( Fig. 64). egonoki sp. nov.

­. Abdominal tergum IX with both anterior and posterior pairs of CPS ( Fig. 53)....... ............................................................................................................. consociatus

24 (22) Abdominal sternum VII with all setae situated at posterior margin ( Fig. 124) ........ ....................................................................................................................... salicis

­. Abdominal sternum VII with median pair of setae in front of posterior margin.. 25

25 (24) Abdominal terga IV–VII with some lines of sculpture medially ( Fig. 38).. betulae

­. Abdominal terga III–VII without lines of sculpture medially (cf. Fig. 28). ......... 26

26 (25) Pronotum with a pair of elongate anteromarginal setae subequal in length to posteromarginal setae I of pronotum, with about 20 discal setae ( Fig. 94); antennal segment III uniformly yellow and without apical neck ........................... japonicus

­. Pronotum without such anteromarginal setae, with more than 40 discal setae ( Figs. 21–22, 147); antennal segment III brown with apex and base yellow, and tapering to apical neck ........................................................................................................ 27

27 (26) Abdominal tergum IX with B2 and B3 setae elongate, each more than 1.7 and 1.5 times as long as tergum IX median length ( Fig. 151) ............... yamagishii sp. nov.

­. Abdominal tergum IX with B2 and B3 setae less than 1.5 and 1.3 times as long as tergum IX median length ( Fig. 31) ............................................................... araliae

28 (1) Apterous; antennae 6­segmented ( Fig. 18)......................................... annulicornis

­. Macropterous; antennae 7­ or 8­segmented.......................................................... 29

29 (28) Antennal segment VI more than 1.0 times as long as combined length of segments I–V, and with numerous long setae and no microtrichia (cf. Figs. 47); abdominal sterna with discal setae in addition to posteromarginal setae (cf. Figs. 65) ......... 30

­. Antennal segment VI less than 0.7 times as long as combined length of segments I–V (cf. Fig. 3, 39, 59); other character states variable ........................................ 31

30 (29) Abdominal terga VII and VIII with B4 setae minute, but tergum VI with B4 setae not minute ( Fig. 49); antennal segment VI more than 2.0 times as long as the combined length of segments I–V ( Fig. 47).............................................. chaetogastra

­. Abdominal terga VI–VIII with B4 setae minute; antennal segment VI usually less than 1.5 times as long as the combined length of segments I–V ( Figs. 54, 68–69). ............................................................. auratus , consociatus , egonoki , nilgiriensis

31 (29) At least abdominal sternum VIII with discal setae in addition to posteromarginal setae (cf. Figs. 65, 85–86)..................................................................................... 32

­. Abdominal sterna with posteromarginal setae only.............................................. 38

32 (31) Abdominal tergum II with four lateral marginal setae.......................................... 33

­. Abdominal tergum II with three lateral marginal setae ........................................ 36

33 (32) Fore wings banded (cf. Fig. 129); abdominal segments bicoloured, tergum VIII and segments IX–X dark brown, terga III–VII with median brown markings; antennal segment VI not elongate and distinctly tapering to apex ( Fig. 132) .......... ............................................................................................................... setiventris

­. Fore wings not banded; abdominal segments uniformly yellowish brown although often with pale brown patches, never bicoloured; antennal segment VI truncate, not distinctly tapering, often distinctly elongate ( Figs. 39, 59, 83)...................... 34

34 (33) Antennal segment VI with microtrichia on both dorsal and ventral surfaces, about 0.3 times as long as combined length of I–V ( Fig. 39) ............................... betulae

­. Antennal segment VI without microtrichia, more than 0.4 times as long as combined length of I–V ( Fig. 59, 83).......................................................................... 35

35 (34) Antennal segment V about 1.3 times as long as wide, more than 0.6 times as long as IV ( Fig. 83), III pale in basal third; abdominal tergum IX with SB1 setae near posterior margin ( Fig. 84–85)..................................................................... glycines

­. Antennal segment V about as long as wide, less than 0.5 times as long as IV( Fig. 59), III uniformly pale brown; abdominal tergum IX without SB1 setae near posterior margin .................................................................................... desleyae sp. nov.

36 (32) Antenna 7­segmented, segment VI about 0.3 times as long as combined length of segments I to V ( Fig. 3) ............................................................................... acaciae

­. Antenna 8­segmented, segment VI more than 0.5 times as long as combined length of segments I to V (cf. Fig. 144)................................................................ 37

37 (36) Forked sense­cones of antennal segments III and IV almost as long as length of V, III brown; mesonotum with median pair of setae not far from posterior margin; tergum IX with SB1 setae half length of B1 setae ( Fig. 13)........................... albus

­. Forked sense­cones of antennal segments III and IV about 1.5 times as long as length of V ( Fig. 144), III pale; mesonotum with median pair of setae far from posterior margin (cf. Fig. 145); tergum IX with SB1 setae subequal length to B1 setae ( Fig. 146) ..................................................................................... tschirkunae

38 (31) Postocular setae III distinctly stouter and longer than other setae, more than half length of ocellar setae III (cf. Fig. 98)............................................................. latus

­. Postocular setae III not as above, not distinctly stouter and longer than other setae .............................................................................................................................. 39

39 (38) Antennal segment VI not elongate and distinctly tapering in distal half, and with 9 setae as in female, less than 0.2 times as long as combined length I–V, with microtrichia on both dorsal and ventral surfaces ( Figs. 24, 26, 76) ..................... 40

­. Antennal segment VI more or less elongate and truncate, and with more than 20 setae, more than 0.3 times as long as combined length I–V, without microtrichia at least on dorsal surface (cf. 121, 140).................................................................... 41

40 (39) Fore wings banded (cf. Fig. 73)................................................... fasciatus sp. nov.

­. Fore wings not banded.................................................................................. araliae

41 (39) Abdominal tergum II with three lateral marginal setae. [antennal segment VI about 0.4 times as long as combined length of segments I–V.].............. shihoae sp. nov.

­. Abdominal tergum II with four lateral marginal setae.......................................... 42

42 (41) Antennal segment VI without microtrichia, 0.5–0.6 times as long as combined length of segments I–V ( Fig. 121).................................................................. ricini

­. Antennal segment VI with microtrichia on ventral surface, less than 0.4 times as long as combined length of segments I–V............................................................ 43

43 (42) Pronotum with one pair of elongate anteromarginal setae, subequal in length to ocellar setae III (cf. Fig. 94); mesonotum with a pair of CPS anteromedially; antennal segment VI about 0.4 times as long as combined length of segments I–V ................................................................................................................. japonicus

­. Pronotum with anteromarginal setae, shorter than ocellar setae III; mesonotum without CPS anteromedially; antennal segment VI about 0.3 times as long as combined length of segments I–V........................................................................ salicis