Scirtothrips convexum, NG & AIN & RAFTI & LAU, 2023

NG, Y. F., AIN, N., RAFTI, N. S. & LAU, K. H., 2023, A new genus and species of Scirtothrips genus-group (Thysanoptera, Thripidae), with two new species of Scirtothrips, from Dipterocarp Forest canopy in Malaysia, Zootaxa 5306 (5), pp. 586-594 : 589-593

Scirtothrips convexum sp.n.

( Figs 11–18 )

Female macroptera. Body brown ( Fig. 13 ); pronotum, femora, tibiae and tarsi brown; antennal segments I–VIII uniformly brown, fore wings with longitudinal area shaded ( Fig. 18 ); abdominal tergites II–VIII brown, anterocostal ridges dark brown; sternites IV–VII brown. Antennae 8-segmented, segment III–IV with forked sense cone short, not reaching more than one-third the length of succeeding segment ( Fig. 16 ); Head about 2.5x wider than long, postocular and ocellar region closely striate with tiny internal markings; ocellar setae I present and ocellar setae III arise between hind ocelli ( Fig. 11 ); Pronotum about 2.5x wider than long, with closely spaced striae with tiny internal markings, 4 pairs of posteromarginal setae, all setae short without prominent pair ( Fig. 11 ); Metanotum with a few convex lines anteriorly, longitudinally striate medially, transversely striate near posterior margin, setae far behind anterior margin ( Fig. 12 ). Fore wing first vein with 4+1+2 setae. second vein with 1 seta; fore wing clavus with 2 marginal setae and one discal seta. Abdominal tergites II–VI with setae S1 close together, the distance between bases less than the setal length; lateral striae lines covered with dense rows of minute microtrichia, lateral posteromargin with comb ( Fig. 13 ), VIII with posteromarginal comb complete, without any rows of microtrichia anteromedially ( Fig. 17 ). Sternites fully covered by rows of microtrichia across segment; II–VI with 6 posteromarginal setae, complete comb of short microtrichia on posterior margin; sternite VII anterior margin convex with paired flange projection ( Fig. 15 ).

Measurements (female in microns). Distended body length 734. Head width across eyes 142. Pronotum, length 60, width 156; posteromarginal setae length 11–11. Metanotum median setae 14, submedian setae 23. Fore wing, length 492; setae length on first vein 7–11. Antennae segments III–VIII length 36, 35, 23, 31, 6, 10. Tergites IV–VII S1 length 7–15, distance between bases 7–17.

Male macroptera. Pale colour, abdominal segment bicoloured, tergites IV–VI with darker markings laterally. Sculpture on the metanotum with spacer striae and fewer transverse striate on the posterior area. tergite IX with drepanae.

Material studied. Holotype female: MALAYSIA, Pasoh Research Station, Negeri Sembilan, Yellow Pan Trap at Canopy Tower , 2.vii.2020 (Ain N. & Ng, Y.F.) (in CISUKM). Paratypes: Total 10 females and 3 males were collected at same canopy tower – 4 females collected with the holotype, 5 females collected 19–20.viii.2012, 1 female 12.iii.2020; 2 males collected 19.viii.2019, 1 male 2.xii.2019 (in CISUKM and ANIC) .

Comments

This new species is similar to Scirtothrips aurantiae and S. hitam in having complete rows of microtrichia across the sternites. It can be distinguished by the following character states: 1. Pronotum without prominent posteromarginal setae; 2. Metanotum with irregular longitudinal striate but a few transverse striae near posterior margin; 3. Abdominal sternite VII anterior margin convex with a paired flange projection.

Figures

FIGURES 11–18. Scirtothrips convexum sp. n. (11) Head and Pronotum; (12) Meso- and metanotum; (13) Female abdominal tergites V–IX; (14) Meso- and metasternum; (15) Sternites II–VII, female; (16) Antennal segments I–VIII, female; (17) Female abdominal tergites VII–X; (18) Fore wing;