Melanagromyza macilenta, Sasakawa, Mitsuhiro, 2013

Sasakawa, Mitsuhiro, 2013, Thailand Agromyzidae (Diptera) — 2, Zootaxa 3746 (4), pp. 501-528: 512-513

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Melanagromyza macilenta

sp. nov.

Melanagromyza macilenta  sp. nov.

( Figs 19–21View FIGURES 19 – 29)

Type material. Holotype male (QBSG), Loei, Phu Ruea National Park, 17 ˚ 30.735 ´N, 101 ˚ 20.601 ´E, 1352 m, a.s.l., 19–26 ix 2006, Malaise trap, Nukoonchai Jaroenchai. Paratype ♀, same data as holotype.

Diagnosis. Black species with wing length 1.9 –2.0 (1.9) mm; mesoscutum weakly shining coppery; calypter with fringe whitish; surstylus lobate, with about 23 spines in three rows, hypandrium with basal apodme slightly longer than sidearm, meso- and distiphallus thin.

Description. MALE. Black; ocellar triangle matt; lunule brown-tinged, slightly grayish pruinose; arista brown; mesoscutum weakly shining coppery when viewed from rear; abdomen brownish black, shining. Wing hyaline; calypter pale brownish yellow, with fringe yellowish white.

Frons 1.4 times as wide as eye, converging ventrally; parafrontalia slightly projecting above eye in profile; ors and ori each two; oh minute, reclinate, in row; ocellar triangle small, not extending ventrally to level of first ori; lunule higher than semicircle; eye 1.5 times as high as wide, bare; gena narrow, 1 / 9 as high as eye. First antennal flagellomere orbicular, wider than genal height; arista almost as long as eye width, microscopically pubescent.

Mesoscutum with 0+ 2 dc, eight rows of acr. Wing 1.9 mm long; costa extending to M 1, with three sections in proportion of 37: 10: 9; r-m beyond midpoint of discal cell (12: 9); M 1 ratio 3.6; ultimate section of CuA 1 about 2 / 3 as long as penultimate section. Mid tibia with two pd.

S 6 thrice as long as S 5, with emargination on posterior 1 / 4. Epandrium with surstylus narrowly lobate, incurved, bearing 22–24 spines in three irregular rows marginally and several setae; cercus 2 / 3 as high as epandrium, bearing a row of six stout setae anteroventrally. Hypandrium 250 µm long, with basal apodeme long (130 m). Phallapodeme 450 µm long; phallus 300 µm long, thin and ill-chitinized, basiphallus U-shaped in ventral view, with long membranous lobe distally (very weakly chitinized along dorsal margin), meso- and distiphallus each simple; ejaculatory apodeme 190 µm long, 90 µm wide.

Body length 2.0 mm.

FEMALE. Similar to male, but mesoscutum more weakly shining, without coppery sheen; wing length 2.0 mm.

Distribution. Thailand.

Remarks. This species somewhat resembles Melanagromyza alternata Spencer, 1961  a, known from Taiwan, and M. normalis Spencer, 1962  b, from New Ireland (both species were described from the females only), but is readily distinguishable by its mesoscutum with a trace of metallic coloration, and also by its smaller size from the former species (wing length 2.6 mm in M. alternata  female) and by its higher lunule from the latter (semicircular in M. normalis  ). Also, M. macilenta  is externally similar to M. yodai Sasakawa  , but the male genitalia are quite different from each other (Key: couplet 18).

Etymology. The specific name refers to the thin (Latin: macilentus) phallus.