Melanagromyza pandiculata, Sasakawa, Mitsuhiro, 2013

Sasakawa, Mitsuhiro, 2013, Thailand Agromyzidae (Diptera) — 2, Zootaxa 3746 (4), pp. 501-528: 516

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Melanagromyza pandiculata

sp. nov.

Melanagromyza pandiculata  sp. nov.

( Figs 28–32View FIGURES 19 – 29View FIGURES 30 – 36)

Type material. Holotype male (QBSG), Chaiyaphum, Tat Tone National Park, 15 ˚ 59.037 ´N, 102 ˚02.103´E, 250 m a.s.l., 23–26 vi 2006, Litter sample, Bunjong Pakeaw. Paratype: ♂, same locality as holotype, 21–28 vi 2006, Malaise trap, Patikhom Thumtip.

Diagnosis. Black; ocellar triangle large, brilliantly shining; mesoscutum and abdomen without metallic luster; calypter with fringe black; gena broad; first antennal flagellomere distinctly whitish-pilose; epandrium with two long spines on inner anteroventral margin; surstylus broad, with about 30 spines in three irregular rows; phallus with distinct swellings on ventral and dorsal sides.

Description. MALE. Black; ocellar triangle strongly and parafrontalia scarcely shining; lunule slightly grayish pruinose; first antennal flagellomere faintly brown-tinged, arista brown to black; thorax shining, mesoscutum and pleuron very sparsely gray-pollinose, mesopleural suture and wing base brownish white, scutellum matt; abdomen strongly shining. Wing hyaline, base of veins brownish white or yellowish; calypter grayish white, with margin brown and fringe black.

Frons 1.3 times as wide as eye, parallel-sided; ocellar triangle distinctly narrowed ventrally, with tip extending to level of first ori; parafrontalia and parafacialia slightly projecting beyond eye in profile; ors two, first ors only a little longer than second ors, ori two, shorter than ors, first ori reclinate, second ori inclinate; oh minute, reclinate or erect, in row; lunule semicircular; face with carina narrow; eye 1.2 times as high as wide; gena 1 / 4 – 1 / 5 as high as eye; pm five. First antennal flagellomere small, slightly shorter than wide, as wide as genal height, rounded apically, with white pile distinct; arista shorter then eye height, appearing bare (microscopically pubescent).

Mesoscutum with 0+ 2 dc, eight to ten rows of acr before transverse suture but four to six rows behind level of anterior dc, ipa 1 / 3 – 1 / 4 as long as opa. Wing 1.7–2.2 (1.7) mm long; costa extending to M 1, with three sections in proportion of 36: 10: 9; r-m beyond midpoint of discal cell (8–11: 5); M 1 ratio 3.3 –4.0; ultimate section of CuA 1 1 / 2–3 / 4 as long as penultimate section. Mid tibia with two pd.

S 6 1.5 times as long as S 5, twice as wide as long, with shallow emargination posteriorly. Epandrium with two long spines on inner anteroventral margin; surstylus almost as wide as epandrium, bearing 28–30 spines in three to four irregular rows; cercus narrow, slightly shorter than epandrial height; proctiger trapezoidal, membranous except for narrowly chitinized lateral margins. Hyapandrium 390 µm long, with basal apodeme long (about 3 / 4 as long as sidearm); pregonite narrow, postgonite serrated on tip ( Fig. 29View FIGURES 19 – 29). Phallapodeme 650 µm long; phallus 350 µm long, basiphallus V-shaped in ventral view and with membranous swelling which is spinulose on distal half, distiphallus narrowed basally but bifurcated distally and surrounded laterally by membranous lobes covered with many microscopic scales or granules; dorsal membranous swelling between basi- and distiphallus distinctive, containing weakly chitinized hypophallic sclerites; ejaculatory apodeme 220 µm long, 80 µm wide.

Body length 1.8–2.3 mm.

FEMALE. Unknown.

Distribution. Thailand.

Remarks. This species resembles the Australian Melanagromyza anceps Spencer  and M. avicenniae Spencer  in the body coloration and the characteristic form of the phallus, but its frons is narrower, the gena is broader, and acr are arranged in denser rows than those of both species. It is more closely related to the former species than the latter in size and chaetotaxy: in M. anceps  , wing is 1.9 mm long, dc is two, and the distiphallus is distinctly bifurcated before end (Spencer 1977 b: fig. 6), while in M. avicenniae  , the wing is 3.2 mm long and there are three dc (distal part of distiphallus is illustrated indistinctly, fig. 11).

Etymology. The specific name refers to the expanded (Latin: pandiculatus) phallus.