Habrandrothrips, Okajima & Masumoto, 2025

Habrandrothrips gen. nov.

Generic definition. Macroptera or microptera. Head almost as long as wide, or a little longer, with a pair of postocular setae. Eyes moderately developed; ocelli rather small; interocellar and postocellar setae minute. Antenna 8-segmented; segment VIII not constricted at base, widely and closely joined to segment VII, these two segments forming a single segment; segments III with two (1+1), segment IV with two (1+1) or four (2+2) sense cones. Mouth cone rather long and pointed ( Figs 12 View FIGURES 6–17 & 20 View FIGURES 18–24 ); maxillary stylets rather wide apart, almost V-shaped, reaching postocular setae; maxillary bridge weak, situated a level of basal collar of head, about 0.3 times as wide as head. Prothoracic five pairs of major setae developed, but relatively short; notopleural suture complete. Prosternal basantra and ferna moderately developed; prospinasternum transverse, but reduced; mesopresternum reduced medially, with lateral small plates. Metathoracic sternopleural sutures absent. Fore legs stout; fore tarsus with a stout tooth ( Figs 15 View FIGURES 6–17 & 22 View FIGURES 18–24 ). Fore wings, if present, scarcely narrowed medially, with duplicated cilia. Abdominal tergites II–VII each with two pairs of sigmoid wing-retaining setae at least in macroptera. Tube about 0.5 times as long as head, tapering and straight-sided. Terminal setae longer than tube. Male structures unknown.

Type-species. Habrandrothrips phuketanus sp. nov.

Comments. This genus is established for two bicolored species ( Figs 6 & 7 View FIGURES 6–17 ), H. phuketanus sp. nov. from southern Thailand and H. sulawesianus sp. nov. from Sulawesi, Indonesia. Both species are known only from females. The genus may be closely related to Neandrothrips gen. nov., but can be distinguished in having antennal segments VII and VIII closely joined into a single segment outline ( Figs 17 View FIGURES 6–17 & 24 View FIGURES 18–24 ), the mouth cone slightly pointed ( Figs 12 View FIGURES 6–17 & 20 View FIGURES 18–24 ), and the mesopresternum strongly reduced medially (cf. Fig. 20 View FIGURES 18–24 ) with a pair of lateral small triangles. Leptandrothrips gen. nov. and Xyphandrothrips gen. nov. also have the terminal two antennal segments closely joined (cf. Figs 30 View FIGURES 25–32 & 373 View FIGURES 366–373 ), but have the mouth cone broadly rounded, the maxillary stylets long and rather close together (cf. Figs 25 View FIGURES 25–32 & 359 View FIGURES 359–365 ), and the mesopresternum not so strongly reduced medially (cf. Figs 43 View FIGURES 41–48 & 393 View FIGURES 390–399 ). Moreover, Leptandrothrips has the fore tarsus unarmed (cf. Fig. 29 View FIGURES 25–32 ). Interestingly, although the type-species, phuketanus , has four major sense cones (2+2 +1) on the antennal segment IV, the other congener, sulawesianus , has only two (1+1) sense cones on that segment ( Table 2). This indicates that the sense cone formula can easily change in this group of phlaeothripine thrips. These two species were taken from dead leafy branches, but their feeding habits are uncertain. Moreover, this genus is not so closely related to Mesandrothrips and Xylaplothrips .

Key to Habrandrothrips species

1. Antennal segment IV with four (2+2 +1) sense cones; tube largely brown, with extreme base somewhat paler ( Fig. 16 View FIGURES 6–17 ); S2 setae on tergite VIII expanded................................................................. phuketanus sp. nov.

-. Antennal segment IV with two (1+1) sense cones; tube brownish at apical half, yellowish at basal half ( Fig. 23 View FIGURES 18–24 ); S2 setae on tergite VIII blunt or very weakly expanded, at least not distinctly expanded...................... sulawesianus sp. nov.