Hoplandrothrips flavicornis sp. n., 2024

Okajima, Shûji & Masumoto, Masami, 2024, The genus Hoplandrothrips and its relatives (Thysanoptera: Phlaeothripidae) from Southeast Asia and Taiwan, Zootaxa 5489 (1), pp. 22-91 : 43-44

Hoplandrothrips flavicornis sp. n.

(Figs, 28, 170–176)

Female (macroptera). Distended body length: 2.6–2.7mm. Body uniformly brown, with red hypodermal pigments. Antennal segments I– II dark brown, slightly darker than head, segment III yellow, segments IV – VI pale brown with basal 1/2 yellowish, segment VII pale brown with basal 1/3 yellowish, segment VIII brown. Femora brown; tibiae and tarsi yellow. Fore wings almost clear. All prominent setae pale. Head ( Fig. 170 ) elongate, 1.43 times as long as wide, dorsal surface probably smooth, sculptured laterally. Cheeks weakly rounded, constricted behind eyes, serrated, each with a few setae. Postocular setae well-developed, almost as long as eyes, expanded. Eyes about 1/3 as long as head, with at least one somewhat large ommatidium postero-laterally. Antennae ( Figs 171 & 172 ) about 1.9 times as long as head; segment VIII long, distinctly constricted at base, pedicellate; segment III about 2.0 times as long as wide, almost as long as segment IV, with three sense cones. Maxillary stylets rather short, not reaching middle of head, close together, 7–8μm apart at middle. Pronotum 0.67 times as long as head, 1.56 times as wide as long; am setae reduced, about 0.5 times as long as aa, but expanded, remaining four pairs of prominent setae elongate, expanded. Metanotal median pair of setae acute, 43–45μm apart from anterior margin, 70μm apart from one another. Fore tarsal tooth distinct. Fore wings each with 5–8 duplicated cilia, 6–8 in holotype; three sub-basal setae ( Fig. 175 ) expanded, S2 the longest. Tergite IX posteromarginal setae longer than tube, sharply pointed, S2 longer than S1, intermediate setae shorter than 1/2 of S1. Tube ( Fig. 176 ) about 0.6 times as long as head, 1.92 times as long as wide in holotype. Terminal setae much longer than tube.

Measurements (holotype female in μm). Body length about 2700 (distended). Head length 265, from anterior margin of eyes 240, width across eyes 175, maximum width across cheeks 185; eyes length 88, width 55–58; postocular setae 88–90. Antenna total length about 500, segments I–VIII length (width) as follows: 50 (48), 53 (35), 73 (37), 72 (37), 65 (31), 62 (27), 55 (22), 43 (12). Pronotum length 179, width 280. Setae on prothorax: am 28, aa 60, ml 70, pa 70, epim 65–67, cox 50. Fore wing length 940. Sub-basal wing setae: S1 50, S2 58 –60, S3 50. Tergite IX setae: S1 160–170, S2 180–185. Tube length 160, maximum width 83; terminal setae 230.

Male. Unknown.

Type series. Holotype: macropterous female, Peninsular Malaysia, Tapah, on dead leaves, 26.vii.1976, SO . Paratype: Peninsular Malaysia, NE 13km from Tapah, 1 female, on dead leaves, 27.vii.1976, SO .

Remarks. H. flavicornis is somewhat similar to H. graminicola sp. n. described below from Thailand in having the posteromarginal setae on abdominal tergite IX long and pointed and the head elongated with rather short maxillary stylets. However, it can easily be distinguished from the latter by the paler antennal segment III, pedicellate antennal segment VIII, and the sub-basal wing setae S3 expanded. Unfortunately, the prosternal sclerites of this species could not be observed, because both the holotype and paratype females were not macerated in KOH solution.

Figures

FIGURES 170–176. Hoplandrothrips flavicornis sp. n., female. (170) Head and prothorax; (171) antenna; (172) antennal segments III–IV; (173) metanotum; (174) pelta; (175) sub-basal wing setae; (176) tube.