Streothrips moundi, Ng & Eow, 2012

Ng, Y. F. & Eow, L. X., 2012, A new species of Streothrips (Thysanoptera: Aeolothripidae) from Malaysia, with description of male and key to species, Zootaxa 3181 (1), pp. 58-62 : 59-62

Streothrips moundi sp. n.

Female macroptera. Body bicolored ( Fig. 1 ), head, pro-, meso- and metanotum uniformly brown, abdomen bicolored, segments I–II, XI–X uniformly brown, III–VIII paler. Antennae segments I–IV pale, segment V brown slightly pale at extreme base, segments VI–IX brown; fore tarsi pale, mid and hind tarsi brown, all tibiae and femora brown except hind tibiae slightly paler at extreme base; forewing dark at extreme base, with two transverse dark bands. Head rounded ( Fig. 4 ), cheeks evenly convex, head wider than long with irregular transverse striations, posterior margin with transverse striations irregular and widely separated; pre-ocellar area with a few weak tuberculate striations and about 16 pre-ocellar setae, ocellar triangle smooth with one pair of setae slightly longer than an ocellus arising between hind ocelli, post-ocellar area with at least 30 setae; eyes prolonged ventrally with posterior facets large ( Fig. 3 ); maxillary palps 3-segmented. Holotype right antenna aberrant with 8 segments; left antenna 9-segmented, segments III–IV with linear sensorium ( Fig. 15 ), on segment IV not wider apically, about 0.4 times as long as length of segment. Pronotum with closely spaced transverse striations, with about 20 discal setae but no major setae ( Fig. 4 ); mesonotum sculpture similar to pronotum, with a pair of median setae widely separated; metanotum with sculpture on anterior half similar to pronotum but forming U-shaped pattern ( Fig. 5 ), posterior half with a few irregular striations medially; mesosternum and metasternum with well developed spinula. Abdominal tergites gradually wider towards posterior; tergite I with few striations on anterior, II–X with transverse striations, III–VII with paired campaniform sensilla anterior to median setae. Sternite II with 2 pairs of posteromarginal setae, III–VII with 3 pairs ( Fig. 8 ); sternite VII with 2 pairs of sub-median accessory setae ( Fig. 10 ); all abdominal sternites without discal setae, sternite VII with pair of small campaniform sensilla antero-laterally.

Measurements (holotype female in microns). Body length 1950. Head, length 143; width across eyes 214; width across cheeks 242. Pronotum, length 193; width across pronotum 270. Left antennal segments I–IX length (sensorium length), 29, 61, 120 (35), 90 (38), 65, 20, 17, 15, 13.

Male macroptera. Body bicolored ( Fig. 2 ), head, pro-, meso- and metanotum similar to female; abdominal segments bicolored, segments I–II and V–X uniformly brown, segments III–IV pale; antennae segments I–IV pale, IV slightly darker at apex, V–IX uniformly darker; fore tarsi pale, mid and hind tarsi brown; fore tibiae pale, mid tibiae brown, hind tibiae pale at basal one-third, all femora brown. Fore wing similar to female ( Fig. 7 ). Structure generally similar to female, antennal segment V relatively longer. Abdominal tergite I about 1.15 times longer than wide ( Fig. 11 ), with pair of longitudinal ridges; tergite II with U-shaped rows of striations medially; abdomen almost parallel-sided, smaller than female; tergite VIII with pair of tooth-like lobes posterolaterally ( Fig. 12 ); tergite IX setae S1, S2 and S3 arising laterally ( Fig. 12 ). Sternite VI with 3 pairs of posteromarginal setae, pairs I–II stout, sternite VIII with 4 pairs, pairs I–II stout and much longer than the others ( Fig. 13 ); all abdominal sternites without discal setae.

Measurements (paratype male in microns). Body length 1340. Head, length 112; width across eyes 190; width across cheeks 200. Pronotum, length 150; width 210. Left antennal segments I–IX length (sensorium length), 29, 60, 100 (20), 92 (25), 80, 14, 12, 8, 15.

Specimens studied. Holotype female. MALAYSIA, Selangor, Hutan Simpan Kota Damansara , 5-7.vi.2011 (Nicholas, S. & Idris, A.B.) (in Centre for Insect Systematics ( CIS), UKM, Malaysia) . Paratype: 1 male collected with holotype (in CIS) .

Comments. All three species of Streothrips have the basal antennal segments unusually pale, the first antennal segment of Aeolothripidae usually being as brown as the head. S. arorai is known only from the original brief description of a single female, and so comparisons with this new species are limited. However, Bhatti (1971) stated that the forewing pattern of S. arorai is similar to that of Aeolothrips fasciatus , whereas the dark bands are more extensive in the new species. Moreover, Bhatti (1967) provided for arorai the following measurements of antennal segments III–IV and their sensoria: 125 (45–46) and 112–113 (67–74); thus the sensoria are 0.36 as long as segment III, and more than 0.6 as long as segment IV. In contrast, the ratios for the new species are 0.2–0.3 on III and 0.3–0.4 on IV.

Figures

FIGURES 1–6. Streothrips moundi: (1) Female; (2) Male; (3) Female head and thorax (ventral); (4) Female head and pronotum; (5) Female meso- and metanotum; (6) Female right fore tarsus.

FIGURES 7–15. Streothrips moundi: (7) Male right forewing; (8) Female abdominal sternites IV–VII; (9) Female abdominal tergites VIII–X; (10) Female abdominal sternite VII; (11) Male abdominal tergites I–II; (12) Male abdominal tergites VII–X; (13) Male abdominal sternites VI–X; (14) Male left antenna; (15) Female right antennal segments III–IV.