Dahliphora chaetocauda, Liu, Guang-Chun, 2017

Liu, Guang-Chun, 2017, The little-known genus Dahliphora Schmitz, 1923 of China (Diptera, Phoridae), ZooKeys 714, pp. 141-147 : 143

Dahliphora chaetocauda sp. n. Figs 1-6, 9-10, 13-14

Diagnosis.

Male. Frons without pre-ocellar bristles; postpedicel onion-form, with a long thick and unsegmented arista; notopleura with three bristles; scutellum with four subequal bristles; costa with 19-21 dorsal cilia; wing hyaline, thin veins very obscure. Female. Frons with two supra-antennal bristles.

Description.

Male. Body (Fig. 1) brown, 0.81-0.82 mm long. Frons brown, covered with dense microtrichia and about 70-80 hairs. Frons (Fig. 3) bristles reduced, only two ocellar bristles and two convergent postero-lateral bristles present. Postpedicel (Fig. 4) brown and onion-shaped, with a long, thick and unsegmented arista, bearing sparsely long hairs. Palpus yellow, 0.1 mm long and 0.02 mm wide, with four long and thin bristles on apex and some short hairs along lower margin. Thorax brown. Mesopleuron bare. Notopleura with three bristles. Scutellum with four subequal bristles. Legs yellow, only hind femur light brown. Front tarsus with postero-dorsal hair palisade on tarsomeres 1-4, tarsomere 5 longer than tarsomere 4. Mid and hind tibiae without dorsal longitudinal hair palisades. Hind metatarsus (Fig. 6) with five transverse hair combs. Wing (Fig. 9) 0.66-0.68 mm long. Membrane hyaline, thin veins very obscure and almost inconspicuous. Costal index 0.47-0.48. Costal ratio 1.08-1.10:1. Costa with 19-21 dorsal cilia and each of them approx. 0.03 mm long. Vein sc free. No hair at base of Rs. Vein M2 strongly curved near base, distal half nearly straight. Vein CuA1 slightly S-form. No axillary bristles. Halter brown. Abdominal tergites brown, wider than long, with sparse short hairs along rear margin. Venter yellow, with tiny sparse microtrichia. Hypopygium (Fig. 2) yellowish brown, asymmetrical. Epandrium with short hairs and five to six bristles. Hypandrium (Figs 13, 14) bifurcated. Left hypandrial lobe with a large and long-hairy process, which strongly excavated ventrally. Aedeagus complex drawn out in a long curved process. Anal tube short.

Female. Body (Fig. 5) 0.83-0.88 mm long. Similar to the male, but differs as follows: frons with a pair of supra-antennal bristles. Postpedicel rounded, with 3-segmented apical arista. Palpus 0.08 mm long, 0.02 mm wide. Wing (Fig. 10) 0.66-0.68mm long. Costal index 0.48. Costal ratio 0.94:1. Costa with 15-16 dorsal cilia and each of them about 0.03 mm long. No Dufour’s crop mechanism and abdominal glands discharge.

Etymology.

The species name refers to the character of left hypopygial lobe. To be treated as an adjective.

Material examined.

Holotype, ♂, China, Yunnan, Ruili (24°6′36.55″N, 97°19′12.53″E; 960 m), 04 –Aug– 2009, Jian-Feng Wang. Paratypes, 84 ♂ and 26 ♀, same data as holotype.

Remarks.

In the key to world species ( Borgmeier and do Prado 1975), this new species runs to couplet 2 to D. dispar (described from Brazil and Dominica). It can be differentiated from the latter by the frons without pre-ocellar bristles, wing costa with 19-21 dorsal cilia, vein sc shorter and longer setation on hypopygial lobe.