Paraclius obtus, 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 : 56-57

Paraclius obtus , new species

( Figs. 17–21 )

Material examined. – Holotype: male, Sungei Buloh, 11 May.2005, Mal. 1, (25159, coll. P. Grootaert, Si 814, ZRC).

Paratypes: 1 male, Sungei Buloh, 22 Apr.2005, Mal. 2, (25078, coll. PG, det. PG, Si772) ; 2 males, Sungei Buloh, 11 May.2005, Mal. 1, (25159, coll. PG, Si819) ; 1 male, Sungei Buloh, 11 May.2005, Mal. 1, (25159, coll. PG, det. LZ, Si814) ; 1 male, Sungei Buloh, 11 May.2005, Mal. 2, (25160, coll. PG, det. PG, Si1239, deposited in IOZ) ; 3 males, Sungei Buloh, 22 Apr.2005, Mal. 2, (25078, coll. PG, det. PG, Si775) ; 1 male, Sungei Buloh, 22 Apr.2005, Mal. 2, (25078, coll. PG, det. PG, Si1216) .

Diagnosis. – Antenna dark yellow, first flagellomere with narrow dark dorsal margin, ventral margin yellowish, 2.3 times as long as wide. Mid femur at its base with 3–4 black v (slightly longer than femur is wide) and with a row of 14 spinules on posterior ventral margin.

Description. – Male: Body length 4.7–4.8 mm, wing length 3.9–4.0 mm.

Head metallic green with pale grey pollen. Face narrowing downward, almost touching just below middle, distinctly narrower than first flagellomere. Hairs and bristles black. Mid and lower postocular bristles (including posteroventral hairs) pale. Antenna ( Fig. 18 ) dark yellow, first flagellomere with dark brown dorsal margin, 2.3 times as long as wide; arista black, minutely pubescent with very short basal segment. Proboscis black with black hairs, palpus black with black hairs and black apical bristle.

Thorax metallic green with pale grey pollen. Six strong dc, 5 pairs of acr; scutellum with 6 bristles (lateral pair longest). Propleuron with 1 black bristle at lower part. Legs yellow, fore coxa yellow, mid coxa black with yellow apex, hind coxa mainly dark yellow with black spot. Fore tarsomeres 3–5 black, mid and hind tarsi from tip of tarsomere 1 onward blackish to 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 ( Fig. 19 ) with 3–4 v (slightly longer than femur is wide) basally and Mid femur at its base with 3-4 black v (slightly longer than femur is wide) and with a row of 14 spinules on posterior ventral margin. Fore tibia with 3 ad and 2 pd, apically with 2 short bristles; mid tibia with 4 ad, 3 pd and 1 av, apically with 5 bristles; hind tibia with 4 ad, 4 pd and one row of thin v, apically with 4 bristles. Relative lengths of tibia and 5 tarsomeres LI 1.75: 1.0: 0.5: 0.3: 0.17: 0.2; LII 2.5: 1.2: 0.8: 0.6: 0.4: 0.23; LIII 2.75: 0.9: 1.5: 1.0: 0.5: 0.25. Wing ( Fig. 17 ) hyaline, veins black; R 4+5 and M distinctly convergent apically, CuAx ratio 0.8. Squama yellow with black hairs. Halter yellow.

Abdomen metallic green with pale grey pollen. Hairs and bristles black. Male genitalia ( Figs. 20-21 ): Epandrium longer than wide, lateral lobe short with 3 bristles; cercus black, obtuse apically, with long bristles; hypandrium obtuse apically; aedeagus with small denticles at middle.

Female: Unknown.

Distribution. – Singapore.

Etymology. – The specific name refers to the obtuse ventral apex of cercus.

Remarks. – Paraclius obtus is similar to P. polychaetus , new species, in having the first flagellomere elongated, more than two times as long as wide, and the aedeagus with denticles, but may be separated from the latter by the cercus with the obtuse ventral apex, the mid femur with a row of spinules at its base, and the hind femur without the ventral bristles. In P. polychaetus , the antenna is completely black, mid femur has no denticle-like spines on the posterior ventral margin, but the hind femur has 5 v in the basal half.

Figures

Figs. 17–21. Paraclius obtus, new species: 17, wing; 18, antenna; 19, apex of mid femur, posterior view; 20, cercus; 21, male genitalia.