Paraclius polychaetus, Zhang & Yang & Grootaert, 2007

Zhang, Lili, Yang, Ding & Grootaert, Patrick, 2007, Paraclius (Diptera: Dolichopodidae: Dolichopodinae) Of Singapore, With New Species From Mangroves, Raffles Bulletin of Zoology 55 (1), pp. 49-62 : 57

Paraclius polychaetus , new species

( Figs. 22–25 )

Material examined. – Holotype: male, Sungei Buloh, 11 May.2005, Mal. 1, (25159, coll. P. Grootaert, Si 816, ZRC).

Paratypes: 1 male, same data as holotype ; 2 males, Si830 (deposited in IOZ); 2 males, Sungei Buloh, 11 May.2005, Mal. 1, (25159, coll. PG, det. LZ, Si816) ; 1 male, Sungei Buloh, 10 Jun.2005, Mal. 2, (25168, coll. PG, det. PG, Si1229) ; 1 male, Sungei Buloh, 27 Jul.2005, Mal. 2, (25273, coll. PG, det. PG, Si1282) ; 1 male, Sungei Buloh, 16 Sep.2005, Mal. 1, (25354, coll. PG, det. PG, Si1186) ; 1 male, Sungei Buloh, 16 Sep.2005, Mal. 1, (25163, coll. PG, det. PG, Si1209) ; 1 male, Sungei Buloh, 28 Oct.2005, Mal. 1, (25406, coll. PG, det. PG, Si1219) ; 1 male, Sungei Buloh, 18 Nov.2005, Mal. 1, (25425, coll. PG, det. PG, Si1276) .

Diagnosis. – Antenna brownish; first flagellomere black, 2.2 times as long as wide. Mid femur with 1 black v at basal third (longer than femur is wide), hind femur with 5 black v (slightly shorter than femur is wide) on basal half.

Description. – Male: Body length 5.4–5.5 mm, wing length 4.3–4.5 mm.

Head metallic green with pale grey pollen. Face narrowing downward, distinctly narrower than first flagellomere. Hairs and bristles black. Mid and lower postocular bristles (including the posteroventral hairs) pale. Antenna ( Fig. 23 ) brownish, first flagellomere black, 2.2 times as long as wide; arista black, apicodorsal, minutely pubescent with very short basal segment. Proboscis brown with black hairs, palpus dark yellow with black hairs and black apical bristles.

Thorax metallic green with pale grey pollen. Six strong dc, 6 pairs of acr; scutellum with 6 bristles (lateral pair longest). Propleuron with 1 black bristle at lower part. Legs yellow, all coxae black with yellow apex. Hind femur with extreme tip black. Fore tarsomeres 3–5 brownish; mid tarsus from tip of tarsomere 1 onward black; hind tarsus black. Hairs and bristles black. Mid and hind coxae each with 1 exterior bristle. Mid and hind femora each with 1 preapical bristle. Mid femur with 1 v at basal third (longer than femur is wide), hind femur with 5 black v (slightly shorter than thickness of femur) on basal half. Fore tibia with 4 ad and 2 pd, apically with 2 bristles; mid tibia with 5 ad, 4 pd and 1 av, apically with 4 bristles; hind tibia with 6 ad and 4 pd, apically with 3 bristles. Hind tarsomere 1 with 3 v. Relative lengths of tibia and 5 tarsomeres LI 1.9: 1.1: 0.4: 0.25: 0.24: 0.26; LII 3.0: 1.3: 0.85: 0.65: 0.4: 0.25; LIII 3.25: 1.0: 1.5: 1.0: 0.5: 0.25. Wing ( Fig. 22 ) hyaline, tinged with greyish, veins black; R 4+5 and M distinctly convergent apically, CuAx ratio 0.6. Squama yellow with black hairs. Halter yellow.

Abdomen metallic green with pale grey pollen. Hairs and bristles black. Male genitalia ( Figs. 24–25 ): Epandrium longer than wide, lateral lobe with 3 bristles; cercus with dark brown tip, base yellowish brown; triangular with long bristles; hypandrium with small denticles near base; aedeagus with denticles near apex.

Female: Unknown.

Distribution. – Singapore.

Etymology. – The specific name refers to the hind femur with numerous ventral bristles.

Remarks. – Paraclius polychaetus is similar to P. obtus , new species, by the elongated first antennal flagellomere and the aedeagus with denticles. It may be separated from the latter by the triangular cercus and the hind femur bearing 5 ventral bristles on basal half. In P. obtus , the cercus is rounded with an obtuse ventral apex, and the hind femur bears no ventral bristles.

Figures

Figs. 22–25. Paraclius polychaetus, new species: 22, wing; 23, antenna; 24, cercus; 25, male genitalia.