Ecacanthothrips brevicornis 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 : 28

Ecacanthothrips brevicornis sp. n.

( Figs 3–4 , 65–74 )

Female (macroptera). Distended body length: 2.0– 2.1mm. Body brown. Antennal segments IV–VI scarcely paled basally. All femora brown; fore tibia tinged basally with pale brown, mid and hind tibiae brownish at middle, yellowish at base and apex, all tarsi yellow. Fore wings almost clear, scarcely shaded medially. Prominent setae pale. Head ( Fig. 65 ) about 1.1 times as long as wide; cheeks rounded, swollen laterally, weakly tuberculated, with minute one or two setae; dorsal surface distinctly sculptured with polygonal reticulation, the reticles finer at ocellar region. Postocular setae dilated, shorter than eye, 8–10μm apart from eyes, 130μm apart from each other. Eyes 0.38 times as long as head in holotype. Posterior ocelli 22μm apart from each other. Antenna ( Figs 67 & 68 ) comparatively short, about 1.64 times as long as head; segment VIII short, slightly constricted basally; segment III short, swollen laterally, 1.34–1.37 times as long as wide, a little shorter than segment IV, with at least 7 sense cones mostly on ventral apex; segment IV almost as wide as III, about 1.5 times as long as wide. Mouth cone comparatively short, not reaching prosternal ferna; maxillary stylets reaching eyes. Pronotum weakly reticulate laterally and posteriorly, 0.55 times as long as head, 1.95 times as wide as long; prothoracic five pairs of major setae dilated, am a little shorter than aa, aa and pa subequal in length. Fore tarsal tooth ( Fig. 71 ) short, directed antero-laterally. Metanotum ( Fig. 70 ) sculptured with polygonal reticulation; metanotal median setae situated 25–28μm from anterior margin, 78μm apart from each other. Mesopresternum ( Fig. 69 ) weakly developed. Fore wings with 10–11 duplicated cilia; three sub-basal setae ( Fig. 73 ) dilated, subequal in length. Pelta ( Fig. 70 ) broadly bell-shaped, much wider than long. Tergite IX posteromarginal setae S1 and S2 shorter than tube, blunt or weakly dilated, S1 shorter than S2. Tube ( Fig. 74 ) 0.52 times as long as head, about 2.1 times as long as wide, tapering; terminal setae longer than tube.

Measurements (holotype female in μm). Body length 2050 (distended). Head length 235, from anterior margin of eyes 210, width across eyes 183, maximum width across cheeks 210; eyes length 90, width 60; diameter of posterior ocelli 17–18; postocular setae 65–70. Antenna total length 385, segments I–VIII length (width) as follows: 38 (36), 45 (33), 55 (41), 60 (40), 50 (28), 44 (23), 37 (21), 27 (13). Pronotum length 130, width 253. Setae on prothorax: am 45–47, aa 50–55, ml 40–43, pa 55, epim 50, cox 35–48. Fore wing length 730. Sub-basal wing setae: S1 46 –48, S2 50, S3 46 –50. Tergite IX setae: S1 85, S2 97–100. Tube length 122, maximum width 58; terminal setae 170.

Male (macroptera). Colour very similar to female. Three or four cheek setae stouter; postocular setae a little longer than eyes ( Fig. 66 ). Prothoracic aa elongate, much longer than pa, am short. Fore coxa not extruded; femur ( Fig. 72 ) enlarged, with a pair of apical inner tubercles, fore tibia with a distinct inner tubercle placed basal 1/3, with small inner apical tubercle directed forwardly, fore tarsal tooth stout, directed laterally. Fore wing with 9–11 duplicated cilia. Abdominal sternite VIII with no pore plate; tergite IX S1 setae dilated.

Measurements (paratype male in μm). Body length 1850 (distended). Head length 215, from anterior margin of eyes 193, width across eyes 175, maximum width across cheeks 195; eyes length 80, width 57; diameter of posterior ocelli 20; postocular setae 82–88. Antenna total length 405, segments I–VIII length (width) as follows: 43 (36), 46 (30), 55 (39), 62 (39), 57 (28), 50 (25), 40 (20), 30 (13). Pronotum length 138, width 250. Setae on prothorax: am 35–38, aa 90, ml 61–64, pa 67–70, epim 60–63, cox 40–50. Fore wing length 760. Sub-basal wing setae: S1 53 –55, S2 52 –62, S3 52 –53. Tergite IX setae: S1 85–86, S2 40. Tube length 110, maximum width 58; terminal setae 175.

Type series. Holotype: macropterous female, Indonesia, Bali Is., Buleleng, Desa Melanting , ca 135m alt., 30.viii.2005, SO . Paratypes: Indonesia, 1 male, collected together with holotype ; 1 female, same locality as holotype, but ca 150m alt., on dead branches, 16.viii.2006, SO.

Remarks. E. brevicornis is presumably related to the inarmatus -group together with tenuicornis , but it has the body smaller and the head shorter. It is very similar to tenuicornis from the Philippines, but these two species can easily be distinguished from each other by the antennal structures mentioned in the key above.

Figures

FIGURES 1–14. Ecacanthothrips species. E. andrei 1–2: (1) female; (2) large male. E. brevicornis sp. n. 3–4: (3) female; (4) male. E. claricornis 5–6: (5) female; (6) large male. E. coniger 7–8: (7) female; (8) large male. E. leai 9–11: (9) female; (10) large male; (11) small male. E. moundi 12–13: (12) fmale; (13) large male. E. nigellus: (14) female.

FIGURES 65–74. Ecacanthothrips brevicornis sp. n. (65) Head and prothorax, female; (66) head and prothorax, male; (67) antennal segments II–VIII, female; (68) antennal segments III–IV, female; (69) prosternum and mesopresternum, female; (70) metanotum and pelta, female; (71) fore tibia and tarsus, female; (72) fore tibia and tarsus, male; (73) sub-basal wing setae, female; (74) tube, female.