Melanagromyza ancyla , Sasakawa, Mitsuhiro, 2013

Sasakawa, Mitsuhiro, 2013, Thailand Agromyzidae (Diptera) — 2, Zootaxa 3746 (4), pp. 501-528: 506-508

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Melanagromyza ancyla

sp. nov.

Melanagromyza ancyla  sp. nov.

( Figs 3–8View FIGURES 1 – 8)

Type material. Holotype male (QBSG), Sakon Nakhon, Phu Phan National Park, 17 ˚03.488´N, 103 ˚ 58.497 ´E, 318 m a.s.l., 27 vii – 2 viii 2006, Malaise trap, Sailom Tongboonchai.

Diagnosis. Black; mesoscutum and abdomen shining, but without metallic luster; wing 2.0 mm long, ultimate section of CuA 1 slightly shorter than penultimate section,

calypter with brown fringe; surstylus with 40 long spines on inner anteroventral part; basiphallus and distiphallus each U-shaped in ventral view; ejaculatory apodeme cotyledonous in outline.

Description. MALE. Black; frons and ocellar triangle matt; lunule sparsely grayish pruinose; arista brown; thorax very sparsely gray-dusted, mesoscutum shining, mesopleural suture brownish white; abdomen strongly shining. Wing hyaline; veins whitish brown at bases; calypter brownish white, with margin and fringe brown.

Frons 1.4 times as wide as eye, converging ventrally; parafrontalia slightly and parafacialia linearly projecting beyond eye margin in profile; ors and ori each two; oh reclinate, in row; ocellar triangle with ventral tip extending beyond level of second ors; lunule lower than semicircle; face with carina low, only distinct between antennal bases and shortly ventrad of bases; eye 1.6 times as high as wide, bare; gena 1 / 6 as high as eye; vi shorter than second ori; pm five or six, setula-like, a setula above vi. First antennal flagellomere round, slightly shorter than wide, minutely pilose; arista shorter that eye height, microscopically pubescent.

Mesoscutum with 0+ 2 dc, eight rows of acr anteriorly but six rows behind level of anterior dc; scutellum with apical sc slightly shorter than basal sc. Wing 2.0 mm long; costa extending to M 1, with three sections in proportion of 30: 10: 9; r-m beyond midpoint of discal cell (9: 5); M 1 ratio 4.6; ultimate section of CuA 1 4 / 5 as long as penultimate section (12: 15). Mid tibia with one or two pd.

S 6 1.5 times as wide as long, with very shallow emargination posteriorly. Epandrium with surstylus ( Fig. 3View FIGURES 1 – 8) incurved, almost as wide as epandrial length at base, slightly projecting anteroventrally, bearing 40 long spines in three irregular rows along inner-ventral margin and on anteroventral projection, and two rows extending dorsally along anteroventral margin; cercus 1 / 2 as high as epandrium; proctiger ( Fig. 4View FIGURES 1 – 8) shield-like. Hypandrium ( Fig. 5View FIGURES 1 – 8) 310 µm long, with basal apodeme nearly 1 / 3 as long as sidearm; pregonite with several sensillae. Phallapodeme 550 µm long; phallic hood 100 µm long, well-chitinized on lateroproximal 2 / 3. Phallus ( Figs 6, 7View FIGURES 1 – 8) 310 µm long, basiphallus and distiphallus each U-shaped basally in ventral view, mesophallus with distal tube slightly swollen distally; ejaculatory apodeme ( Fig. 8View FIGURES 1 – 8) 190 µm long, weakly chitinized, expanded alula-like (70 µm wide).

FEMALE. Unknown.

Distribution. Thailand.

Remarks. This species distinctly differs from Melanagromyza pandiculata  sp. nov. in the characters stated in the key (couplet 22). The phallic structure of this species is similar to that of Melanagromyza pasiensis Spencer  (1986: figs 13, 14), but this species is easily recognized by its black mesoscutum and abdomen without greenish sheen, and dark fringe on the calypter. The distal tube of the mesophallus is also distinctive in having a bend at middle and a swelling on the tip, whereas in pasiensis  , it is almost straight and not swollen distally. Moreover, the coloration of pasiensis  is more similar to that of M. albisquama  described above.

Etymology. The specific name refers to the bend (Greek: ankyle) in the mesophallic tube.