Lichtwardtia cambodiensis Tang & Grootaert

Tang, Chufei, Yang, Ding & Grootaert, Patrick, 2018, Revision of the genus Lichtwardtia Enderlein in Southeast Asia, a tale of highly diverse male terminalia (Diptera, Dolichopodidae), ZooKeys 798, pp. 63-107 : 63

Lichtwardtia cambodiensis Tang & Grootaert sp. n. Figs 2, 3

Material.

Holotype male (coll. RBINS): CAMBODIA: Siem Reap prov., Angkhor, Preah Khan Temple, 24 January– 21 February 2006, Malaise trap in secondary forest (leg. Oul Yothin). Paratypes (all coll. RBINS): CAMBODIA: Same provenance as holotype, 13 males, 2 females, 24 January– 21 February 2006; 3 males, 4-11 April 2006; 6 males, 8 February– 7 March 2006; 8 males, 28 November– 7 December 2005; 9 males, 8 March– 5 April 2005; 46 males, 17-24 February 2005; 1 male, 1 female, Siem Reap prov., Bakheng, 23-31 October 2005, Malaise trap in secondary forest (leg. Oul Yothin).

Diagnosis.

Wing entirely hyaline; with a slight swelling of the costa where R1 merges with costa. Postpedicel mainly dark yellow but blackish on apically half, nearly as long as wide. Mid coxa with a dark brown stripe anteriorly, a paler brown band posteriorly. Hind coxa entirely yellow. Cercus rounded, marginal bristles black, not flattened nor on tubercles. Hypandrium simple and smooth, with no denticle; phallus with double rows of spinules on ventral half.

Description.

Male.Body length 3.4-3.7 mm, wing 3.4-3.5 × 1.0 mm.

Head dark metallic green, with thick pale pollinosity; face slightly raised, frons and face both with thick pale pollinosity, gradually narrowed downward. Hairs and bristles on head black but lower postocular bristles pale. Antenna dark yellow; postpedicel blackish on apical half, blunt apically, nearly as long as wide arista-like stylus dark brown, nearly as long as width of head, feather-like, with long pubescence, basal portion 0.2 times as long as apical portion. Proboscis dark yellow, with black hairs; palpus dark yellow, with1 short black apical bristle.

Thorax dark green, with pale grey pollinosity. Hairs and bristles on thorax black; five strong dc, ten pairs of long acr. Scutellum with two pairs sc, apical pair long and strong, basal pair short and weak. Legs mainly yellow; but mid coxa with two large brown square spots laterally: a dark brown stripe anteriorly, a paler brown band posteriorly; mid and hind tarsomeres I–II blackish on tip, mid and hind tarsomere III blackish at apical half, mid and hind tarsomeres IV–V wholly black. Fore and mid coxae anteriorly with rows of bristle-like hairs, fore coxa anteriorly with three long strong marginal bristles, mid coxa with two outer bristles and two marginal bristles, hind coxa with two outer bristles, basal one strong, apical one smaller. Mid trochanter with three short ap, all dorsal. Hind trochanter with two weak ap, one dorsal, one posteroventer. Fore femur with one short weak av. Mid femur with one strong pd and one preapical pv in normal strength. Hind femur with one strong pd at apical quarter. Fore tibia with four ad (of which one strong and preapical), one av and three ap. Mid tibia with two ad, three pd, one pv, and four ap. Hind tibia with four ad, four pd, two pv and three ap. Fore tarsomere I with one short av at base. Hind tarsomere I with one strong ad and two short av. Relative lengths of tibia and five tarsomeres of legs LI: 7.0: 5.0: 2.5: 2.0: 1.2: 1.0; LII: 15.0: 7.5: 3.8: 3.0: 2.0: 1.5; LIII: 16.2: 7.0: 7.5: 5.0: 2.2: 1.5. Wing nearly hyaline, veins brown. Costa slightly widened at the joint with R1. M with fading M2, M1 with one short subvein. Crossvein dm-cu straight. CuAx ratio 1.0. Lower calypter pale with black hairs. Haltere pale.

Abdomen metallic green, with pale pollinosity. Hairs and bristles on abdomen black.

Male terminalia (Figure 3): Epandrium 1.6 times longer than wide; epandrial lobe with three long pale bristles. Ventral surstylus and dorsal surstylus both with five short nail-like ap (Figure 3A). Cercus nearly triangular, margin rounded, pale with broad black outer margin, with weak digitations around outer margin, with black simple marginal bristles on digitations, with two relatively strong bristles on lateral digitations at apical half. Hypandrium simple and smooth, with no denticle. Phallus with double rows of spinules on ventral half.

Female. Similar to male in size and morphology except for the male terminalia.

Etymology.

This new species is named after the country (Cambodia) where it was found.

Comments.

Lichtwardtia cambodiensis sp. n. belongs to the L. nodulata group and thus is related to L. dentalis and L. semakau sp. n. The latter two species both have distinctly darkened and flattened marginal bristles on the cercus while L. cambodiensis sp. n. only has thin, and weak marginal bristles on the cercus. Further, L. cambodiensis has a weak swelling on the joint point of wing vein R1 and costa, whereas the swelling is distinct in L. dentalis , and absent in L. semakau .

Distribution.

Cambodia.