Dolichothrips chikakoae, Mound & Okajima, 2015

Mound, Laurence A. & Okajima, Shûji, 2015, Taxonomic studies on Dolichothrips (Thysanoptera: Phlaeothripinae), pollinators of Macaranga trees in Southeast Asia (Euphorbiaceae), Zootaxa 3956 (1), pp. 79-96 : 82-83

Dolichothrips chikakoae sp.n.

( Figs 1 , 10 , 18 )

Female macroptera: Body and legs dark brown, fore tibiae and all tarsi yellow; antennal segments III–VII yellow, VIII light brown; postocular and pronotal posteroangular setae light brown and finely acute, remaining major setae on pronotum dark brown with broadly blunt apices; fore wing sub-basal setae, and lateral abdominal setae dark brown, tergite IX setae light brown; fore wing clear, weakly shaded on clavus and around sub-basal setae. Head longer than wide, sharply narrowed to base; without sculpture between ocelli, but rest of vertex transversely striate ( Fig. 1 ); po setae finely acute, longer than dorsal eye length, arising laterally; maxillary stylets retracted almost to postocular setae, weakly V-shaped in position, about one third of head width apart medially with prominent maxillary bridge; mouth cone long and pointed, extending between prosternal basantra; maxillary palps about 7 times as long as wide. Antennae 8-segmented; segment III with 3 slender sense cones about as long as segment width, IV with 4 sense cones; VIII narrowed to base.

Pronotum sculptured across entire surface, with longitudinal, darker median ridge; major setae relatively short and bluntly capitate, but pa setae long and finely acute; notopleural sutures complete. Fore femora swollen, inner margin slightly rugose without clearly-defined tubercles; fore tarsal tooth stout, more than half as long as tarsal width. Prosternal basantra long and well-developed; ferna large; mesopresternum of two triangles weakly joined medially, mesoeusternal anterior margin broadly rounded; metathoracic sternopleural sutures not developed. Mesonotum with median longitudinal division scarcely one third as long as this sclerite, lateral setae minute and acute. Metanotum medially with sculpture forming narrow longitudinal parallel reticulation, median setae acute ( Fig. 10 ). Fore wings almost parallel sided, sub-basal setae S1 and S2 with blunt to weakly capitate apices, S3 pointed; with about 10 duplicated cilia.

Pelta broadly triangular with weak sculpture, campaniform sensilla present; tergites II–VII each with an additional pair of curved or weakly sigmoid setae present or absent anterolateral to wing retaining setae ( Fig. 18 ); tergite IX setae pointed, longer than tube; anal setae longer than tube. Sternites with median pair of marginal setae long and slender, arising sub-marginally; about 12 small discal setae in irregular transverse row across each sternite.

Measurements (holotype female in microns). Body length 2500. Head, length 250; width across cheeks 180; po setae 135. Pronotum, length 225; median width 280; major setae, am 45, aa 40, ml 45, epim 50, pa 115. Mesonotal lateral setae 12. Fore wing, length 1000; sub-basal setae 70, 70, 90. Tergite IV lateral setae 100, 55. Tergite IX setae S1 260, S2 230. Tube length 190; longest anal setae 350. Antennal segments III–VIII length 75, 70, 60, 55, 55, 35.

Male macroptera: Similar to female but smaller; tergite IX setae S2 short and stout, longer than iS setae; sternite VIII with no pore plate.

Measurements (paratype male in microns). Body length 2000. Head, length 220; width across cheeks 160; po setae 95. Pronotum, length 175; median width 225; major setae, am 30, aa 35 ml?, epim 50, pa 85. Mesonotal lateral setae 12. Fore wing length 820. Tergite IX setae S1 220, S2 35. Tube length 160. Antennal segments III– VIII length 70, 65, 55, 50, 45, 30.

Specimens examined. EAST MALAYSIA, SARAWAK, Lambir Hills National Park , holotype female. from Macaranga gigantea flowering male bud, 2.vi.2006 (Chikako Ishida), in BMNH .

Paratypes: 1 male taken with holotype; same locality and collector, 1 female from female flower of Macaranga hosei (= pseudopruinosa), 4.vii.2006. SABAH, from Macaranga tanarius: Kota Kinabalu , 1 female, 2.vi.2008, 2 females, 22.ix.2008; Pulau Mamutik, 3 females, 2 males.

Non-paratype : WEST MALAYSIA, Frasers Hill, 1 female from Macaranga gigantea , 30.vi.1999 (Ute Moog 99/150) .

Comments. The holotype female and paratype female are mounted very cleanly in a dorso-ventral position, such that the inner, ventral margins of the fore femora are not easily seen. However, these margins appear to have a row of weakly defined rugosities, although these are not clear enough to be illustrated and are not present either on the male paratype or on the paratypes from Sabah. In contrast, the non-paratype female has the single available fore leg slightly rotated, such that the inner, lower margin of the fore femur is exposed and clearly bears a row of rugosities or indistinct tubercles. It differs from the three specimens of the type series in being larger, the postocular setae 150 microns long, and the posteroangular setae on the pronotum short and dark and similar to the epimeral setae. As indicated in the key above, chikakoae differs from the others in this genus in the unusually long postocular setae, but like eriae and the species related to indicus it has unusually short, pointed mesonotal lateral setae.

Figures

FIGURES 1 – 6. Dolichothrips species, head & pronotum. (1) chikakoae sp. n.; (2) crassusensus; (3) eriae sp. n.; (4) reuteri; (5) longicollis; (6) franae sp. n.

FIGURES 7 – 16. Dolichothrips species. Head & pronotum 7 – 9: (7) macarangai; (8) fialae sp. n.; (9) utae sp. n. Mesonotum and metanotum 10 – 15: (10) chikakoae sp. n.; (11) eriae sp. n.; (12) fialae sp. n.; (13) utae sp. n.; (14) franae sp. n.; (15) reuteri; (16) indicus mesonotum and pelta.

FIGURES 17 – 33. Dolichothrips species. (17) eriae sp. n. fore leg; (18) chikakoae sp. n. pelta, tergites II – III; (19) crassusensus tergites II – IV; (20) fialae sp. n. pelta, tergites II – III; (21) indicus (nesius holotype) tergites II – III; (22) indicus Syntype tergites II – IV; (23) indicus from Mo’orea, pelta, tergites II – III; (24) franae sp. n. tergites II – III. Pelta and tergites II – III 25 – 29: (25) eriae sp. n.; (26) longicollis; (27) macarangai; (28) utae sp. n.; (29) reuteri. Male pseudovirga 30 – 33: (30) fialae sp. n.; (31) longicollis; (32) macarangai; (33) reuteri.