Heteromeringia spinulifera, Sasakawa, Mitsuhiro, 2011

Sasakawa, Mitsuhiro, 2011, Oriental species of clusiid flies (Diptera: Clusiidae: Clusiinae), Zootaxa 3038, pp. 1-28 : 24

Heteromeringia spinulifera sp. nov

( Figs 39–41 )

Type material. Holotype male ( BPBM 17252), Philippines, Luzon, Nueva Vizcaya, Dalton Pass, 915 m, 9–10. IV. 1968, D. E. Hardy. Paratypes: 23,2Ƥ, same data as holotype, but coll. M. Delfinado, and D. E. Hardy and M. Delfinado; 3, Zamboanga del Norte, Manucan, 420 m, 12. X. 1959, L. W. Quate; 3, Camarines Sur, Mt. Isarog, 500– 600 m, 9. IV. 1963, H. M. Torrevillas, light trap.

Diagnosis. Largely black; face and gena yellow in male and blackish in female; palpus brown to black; postpronotal lobe and katepisternum yellow; arista distinctly pubescent; dc two; surstylus narrow; cerci united; mesophallus with dense microscopic spinules on membrane.

Description. MALE. Head black but vertical angle and dorsal orbit brown, face, gena, and ventral half of postgena yellow; frons shining; gena whitish tomentose. Antenna yellow, arista brown; palpus black but yellow on apical 1/3. Thorax black but postpronotal lobe and katepisternum yellow; mesoscutum weakly shining, pleura strongly shining. Wing hyaline, faintly tinged with yellowish brown anteroapically; calypter with margin brown, fringe pale brown; halter yellow. Legs yellow; mid coxa brownish at base, fore femur with brown ring on apical 1/5, fore tibia and tarsomeres 1–4 brown. Abdomen shining black; cercus yellowish brown. Bristles brown to black.

Frons almost as wide as eye, slightly diverging ventrally; first and second or equal in length, third or about 2/3 as long as second or, distance between first and second or 3–3.5 times as long as that between second and third or; oh minute; frontalia with sparse hairs ventrolaterally; oc minute; poc slightly shorter than third or; gena 1/6–1/7 as high as eye: pm three or four. First antennal flagellomere round, slightly broader than long, distinctly pilose; arista sparsely plumose (longest hair about 1/2 as long as width of flagellomere) except for base.

Mesoscutum with two dc, anterior dc far before level of sa, distance between two dc 2.5 times as long as that between transverse suture and anterior dc, eight rows of acr before transverse suture but six rows behind that; scutellum with bsc 1/4 as long as asc. Wing 2.5–3.1 (2.9) mm long; three costal sections in proportion of 38–40: 10: 4.5–5.0, r-m at distal 1/3 of cell dm, M1 ratio 5.0–5.8, ultimate section of CuA1 about 4/5 length of penultimate.

Epandrium ( Figs 39, 40 ) with surstylus and cercus long, surstylus bearing three inner apical spinules and one or two pale, minute spinules, cerci united with each other; proctiger small, strongly chitinized. Hypandrium with two setae; pregonite knob-like, with several short setae; postgonite conical, well chitinized, with three strong apical setae. Phallapodeme ( Fig. 41 ) 160 µm long; mesophallus 840 µm long and microscopically spinulose on membrane, paraphallus as long as hypophallus and right sclerite distinctly serrated at base, distiphallus curved at middle; ejaculatory apodeme 330–350 µm long, 120–140 µm broad.

Body length 3.1–3.7 (3.5) mm.

FEMALE. Similar to male, but face and gena dark brown to black; antenna brownish yellow to pale brown, with scape and pedicel distinctly darker; palpus entirely pale brown; fore tarsomeres 1 and 2 brown, 1–3 rather broad, almost as wide as distal width of tibia; wing with apical infuscation darker than that of male; wing length 3.2–3.6 mm, body length 3.8–4.2 mm.

Variation. A male, collected on Mt. Isarog, has brownish basal and apical rings on the hind tibia (each about 1/ 4 as long as whole tibial length), but the genitalia are typical of the species.

Distribution. Philippines.

Remarks. This new species is similar to New Guinean Heteromeringia stenygralis Sasakawa, 1966 , which also has a yellow postpronotal lobe and katepisternum, and H. papuensis Sasakawa, 1966 , which also has microscopic spinules on the membrane of the mesophallus. The new species differs from H. stenygralis in the coloration of the ventral pleura and hind tibia, and the structures of the male genitalia; in H. stenygralis , the katepisternum is only yellow on the posterior half, the meron is yellow, the hind tibia is brown excluding the extremities, the surstylus is lobate, and the left hypophallus is crescent-shaped ( Sasakawa 1966: fig. 11A, B). Also, it differs from H. papuensis in the coloration of the thorax and the structure of the phallus; in H. papuensis , the postpronotal lobe and katepisternum are brown, the paraphallus is longer, and the distiphallus is almost straight ( Sasakawa 1966: fig. 10B).

Etymology. The specific name refers to the spinulose membrane of the mesophallus.

Figures

FIGURES 36 – 41. Male genitalia of Heteromeringia pectinata sp. nov. (36 – 38, paratype) and H. spinulifera sp. nov. (39 – 41, paratype). 37, pre- and postgonite. Scale = 0.1 mm.