Scirtothrips

Hoddle, Mark S. & Mound, Laurence A., 2003, The genus Scirtothrips in Australia (Insecta, Thysanoptera, Thripidae), Zootaxa 268, pp. 1-40 : 8-10

Key to Australian Scirtothrips species

1. Abdominal sternites IV – VI with microtrichia extending fully across ( Figs 52, 54 )... 2

­. Abdominal sternites IV – VI with microtrichia not extending across median area ( Figs 51, 55, 56 ) ..................................................................................................................... 3

2. Forewing posteromarginal cilia straight; ocellar setae III arising between midpoint of posterior ocelli ( Figs 6, 7 ); metanotal median setae arise well behind anterior margin; tergite IX of female with many discal microtrichia medially; male hind femora without comb of stout setae, and tergite IX without drepanae ............................. dorsalis Hood

­. Forewing posteromarginal cilia undulating; ocellar setae III arising between anterior margins of posterior ocelli ( Fig. 3 ); metanotal median setae arise close to anterior margin; tergite IX of female without discal microtrichia medially; male hind femora with comb of stout setae ( Fig. 37 ), and tergite IX with drepanae .................. aurantii Faure

3. Postocular setal row with 3 or 4 pairs of setae each as long as ocellar setae III ( Figs 2, 9 , 17 ); males where known without drepanae on tergite IX ......................................... 4

­. Postocular setal row with 2 (or 1) pairs of setae as long as ocellar setae III ( Figs 1, 5 , 14 ); males usually with drepanae on tergite IX ............................................................ 8

4. Metanotal sculpture transversely striate or reticulate on posterior as well as anterior ( Fig. 35 ); pronotal posterior margin with 4 pairs of setae; tergites IV – VI with discal setae S1 half as long as S2, distance between bases of S1setae more than twice their length ................................................................................................ helenae Palmer & Mound

­. Metanotal sculpture transverse on anterior but longitudinal on posterior half ( Figs 21 , 32 ); pronotum with 5 pairs of posteromarginal setae; tergites IV – VI with discal setae S1 as long as S2, distance between bases of S1 setae about twice the diameter of their basal pores ..................................................................................................................... 5

5. Pronotal posteromarginal setae all equally short, or at least S2 no more than 1.3 as long as S1 ................................................................................................. eremicus sp.n.

­. Pronotal posteromarginal setae S2 longer, at least 1.5 as long as S1........................... 6

6. Sternites IV – VI with median marginal setae arising in front of sternal margin ( Fig. 55 ); tergite VIII marginal comb complete medially .................. albomaculatus Bianchi

­. Sternal marginal setae all arise at margin ( Figs 53, 56 ); tergite VIII marginal comb often interrupted medially ( Fig. 45 ) .............................................................................. 7

7. Pronotal discal setae short, stout and blunt ................................................ astibos sp.n.

­. Pronotal setae all slender, tapering to apex ................................................. pilbara sp.n

8. Antennae 7­segmented, suture between VII – VIII not developed ............................... 9

­. Antennae8­segmented,suturebetween VII–VIIIusually well­developedbutrarely weak ..................................................................................................................................... 10

9. Body dark brown, head very dark ( Fig. 20 ); pronotal posteromarginal setae S2 about 30 microns long, scarcely longer than width of antennal segment II ............ solus sp.n.

­. Body yellow with brown markings ( Fig. 5 ); pronotal posteromarginal setae S2 about 50 microns long, twice as long as width of antennal segment II ...................................

.......................................................................................... casuarinae Palmer & Mound 10. Abdominal tergite VII with posteromarginal fringe of microtrichia extending mesad of discal setae II, usually complete medially ( Fig. 48 ) ...................................... litotes sp.n.

­. Abdominal tergite VII with posteromarginal fringe of microtrichia not extending mesad of discal setae II ( Figs 45­47 ) .......................................................................... 11

11. Occipital ridge close to posterior margin of eye ( Fig. 18 ), postocular region shorter than diameter of one ommatidium in female, about equal to one ommatidium in male; mouth cone unusually long and slender ...................................... tenor Bhatti & Mound

­. Occipital ridge not close to posterior margin of eye, postocular region longer, equal to diameter of two ommatidia; mouth cone usually not extending beyond fore coxae... 12

12. Ocellar triangle without any regular lines of sculpture between posterior ocelli ( Figs 1 , 13, 19 ) ......................................................................................................................... 13

­. Ocellar triangle with regular lines of sculpture between posterior ocelli, either transversely striate or transversely reticulate ( Figs 6 , 11, 14 )............................................. 17

13. Postocular setal row with only 1 pair of setae as long as ocellar setae III; major setae on head, thorax and forewings bluntly thickened ( Fig. 16 ) ...................... moneres sp.n.

­. Postocular setal row with 2 pairs of setae as long as ocellar setae III; major setae all slender and setiform ( Figs 13, 19 )............................................................................... 14

14. Abdominal tergite I with pair of setae (figs 36, 41); mouth cone extending to mesosternum; male with drepanae on tergite IX 1.5 times as long as median length of this tergite (Fig. 57)....................................................................................... drepanofortis sp.n.

­. Abdominal tergite I with no setae ( Fig. 33 ); mouth cone scarcely extending beyond fore coxae; male drepanae (where known) 0.6 as long as tergite .............................. 15

15. Body uniformly brown; pronotal posteromarginal setae S2 scarcely 0.5 as long as median width of antennal segment II; sternites III – V commonly with 4 pairs of marginal setae ( Fig. 56 ) ............................................................................... quadriseta sp.n.

­. Body yellow with extensive and variable brown markings on head, thorax and abdomen; pronotal posteromarginal setae S2 at least 0.8 as long as median width of antennal segment II ( Fig. 13 ); sternites III – V with 3 pairs of marginal setae ................... 16

16. Abdominal tergites III – V with distance between basal pores of median setae less than 1.5 times the length of these setae ( Fig. 33 ); female tergite IX with three pairs of equally stout posteromarginal setae ( Fig. 38 ); tergite IX dark brown, darker than tergite VIII ......................................................................................................... akakia sp.n.

­. Abdominal tergites III – V with distance between basal pores of median setae at least 2.5 times the length of these setae ( Fig. 38 ); female tergite IX with two pairs of equally stout posteromarginal setae with a small slender pair of setae between them; tergite IX yellowish, paler than VIII ............................................................................ kirrhos sp.n.

17. Forewing posterior margin with all cilia straight without any undulations ................ 18

­. Forewing posterior margin with at least one or two cilia near basal half of wing not straight, sometimes with all cilia weakly to strongly undulating................................ 19

18. Ocellar setae III long, about twice as long as median length of one posterior ocellus ( Fig. 12 ); abdominal tergites with 4 to 6 setae on each lateral microtrichial field ( Fig. 44 ); tergite VIII with microtrichia medially near anterior margin; male tergite IX without paired drepanae .............................................................................. inermis Priesner

­. Ocellar setae III scarcely longer than median length of a posterior ocellus ( Fig. 10 ); abdominal tergites with 3 setae on each lateral microtrichial field; tergite VIII without microtrichia medially near anterior margin; male tergite IX with pair of curved drepanae ........................................................................................................... dobroskyi Moulton

19. Ocellar setae III wide apart, arising on or outside anterior margins of ocellar triangle ( Fig. 14 ) ........................................................................................... longipennis Bagnall

­. Ocellar setae III arising within ocellar triangle, usually closer together than diameter of first ocellus ( Figs 4 , 11 ) .......................................................................................... 20

20. Pronotum with transverse striae widely separated, anterior half of pronotum with several striae further apart than diameter of a discal seta basal pore ( Fig. 11 ); ocellar setae III arising between midpoints of posterior ocelli, posterior to tangent between anterior margins of these ocelli; pronotal posterior margin with more than one pair of setae longer than maximum diameter of antennal segment III ........................... frondis sp.n.

­. Pronotum with transverse striae closely spaced, anterior half of pronotum with striae closer together than diameter of a discal seta basal pore; ocellar setae III arising on or anterior to tangent between anterior margins of posterior ocelli ( Fig. 4 ); pronotal posterior margin with only setae S2 longer than maximum diameter of antennal segment III ............................................................................................................... australiae Hood

Figures

FIGURES 51 ­ 56. Scirtothrips abdominal sternites. 51, australiae V­VII; 52, dorsalis IV­VII; 53, frondis V­VII; 54, aurantii sternites V­VII; 55, albomaculatus sternites IV­VI; 56, quadriseta IV­ VII; 57, drepanofortis male tergites VIII­IX.

FIGURES 1 ­ 10. Scirtothrips heads and pronota. 1, akakia; 2, albomaculatus; 3, aurantii; 4, australiae; 5, casuarinae; 6, dorsalis; 7, dorsalis; 8, drepanofortis; 9, eremicus; 10, dobroskyi.

FIGURES 32 ­ 37. Scirtothrips pro­ meso­ and metanota. 32, pilbara; 33, akakia; 34, solus; 35, helenae; 36, drepanofortis; 37, aurantii male hind leg.

FIGURES 11 ­ 20. Scirtothrips heads and pronota. 11, frondis; 12, inermis; 13, kirrhos; 14, longipennis; 15, litotes; 16, moneres; 17, pilbara; 18, tenor; 19, quadriseta; 20, solus.

FIGURES 21 ­ 31. Scirtothrips pro­ meso­ and metanota. 21, astibos; 22, aurantii; 23, aurantii; 24, eremicus; 25, australiae; 26, dorsalis; 27, dorsalis; 28, aurantii; 29, quadriseta; 30, moneres; 31, dobroskyi.

FIGURES 45 ­ 50. Scirtothrips abdominal tergites. 45, pilbara VI­VIII; 46, quadriseta VI­IX; 47, solus VI­IX; 48, litotes VI­IX; 49, tenor IV­VI; 50, frondis IV­VII.

FIGURES 38 ­ 44. Scirtothrips abdominal tergites. 38, akakia; 39, albomaculatus VI­IX; 40, australiae VI­IX; 41, drepanofortis I­IV; 42, kirrhos IV­VI; 43, moneres IV­VI; 44, inermis IV­VIII.