Ophiomyia quadrifida , Sasakawa, Mitsuhiro, 2013

Sasakawa, Mitsuhiro, 2013, Thailand Agromyzidae (Diptera) — 2, Zootaxa 3746 (4), pp. 501-528: 525-526

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Ophiomyia quadrifida

sp. nov.

Ophiomyia quadrifida  sp. nov.

( Figs 49–53View FIGURES 46 – 56)

Type material. Holotype male (QSBG), Khonkaen, Phu Pha Man National Park, 16 ˚ 43.680 ´N, 101 ˚ 59.772 ´E, 268 m a.s.l., 18–19 vi 2006, pan trap, Prayoon C.G.

Diagnosis. Black; calypter with fringe black; face with carina narrowly raised; vibrissal fasciculus absent; ultimate section of CuA 1 3 / 4 length of penultimate; surstylus with 32 or 33 spines; basiphallic sclerites asymmetric, right sclerite Y-shaped and left one almost straight, distiphallus quadrilobate.

Description. MALE. Black; ocellar triangle shining, parafrontalia scarcely shining; lunule slightly grayish pruinose; arista brown; thorax shining, sparsely gray-dusted; abdomen strongly shining. Wing hyaline; calypter whitish-gray, with margin and fringe black.

Frons nearly 1.5 times as wide as eye, slightly converging ventrally; parafrontalia with ventral part and parafacialia slightly projecting beyond eye margin in profile; ocellar triangle with ventral tip extending to level of second ors; ors and ori each two; oh in rather dense row; lunule lower than semicircle; facial carina narrow but distinct; eye 1.3 times as high as wide; gena 1 / 8 as high as eye, without vibrissal fasciculus. First antennal flagellomere small, rounded apically, as long as wide, moderately pilose; arista as long as eye height, appearing bare (microscopically pubescent).

Mesoscutum with 0+ 2 dc, eight rows of acr anteriorly but four rows behind level of anterior dc. Wing 2.0 mm long; costa extending to M 1, with three sections in proportion of 38: 10: 9; r-m at distal 2 / 5 of discal cell (13: 5); M 1 ratio 6.0; ultimate section of CuA 1 3 / 4 as long as penultimate section.

S 6 twice as long as S 5, 1.5 times as wide as long, with shallow emargiantion posteriorly. Epandrium with surstylus slightly projected, bearing 32 or 33 spines in four to five irregular rows along margin; cercus 1 / 2 as high as epandrium. Hypandrium 380 µm long, with bsal apodeme nearly 1 / 4 as long as sidearm; pregonite with several sensillae, postgonite crescent-shaped. Phallapodeme 660 µm long, slighyly sinuate in basal 1 / 3. Phallus 470 µm long; epiphallus swollen distally; basiphallus with asymmetric sclerites narrow, of which right one Y-forked, with lateral fork joined with left sclerite; distiphallus quadrilobate dorsally and ventrally, with spinules internally in ventral lobes; ejaculatory apodeme 220 µm long, 100 µm wide.

FEMALE. Unknown.

Distribution. Thailand.

Remarks. This species is similar to Ophiomyia centrosematis  and O. rotata (Spencer, 1965)  in having the characteristic sclerites of basiphallus, but is easily distinguished from them by its densely spinose surstylus, crescent-shaped postgonite, and four-lobed distiphallus. The distiphallus of O. rotata  (Spencer 1965: fig. 1, as Melanagromyza  ) has 12 strong spines on a bowl-shaped dorsal process and two distal processes.

Etymology. The specific name refers to the distiphallus split into four parts (Latin: quadrifidus).