Melanagromyza lunulata, Sasakawa, Mitsuhiro, 2013

Sasakawa, Mitsuhiro, 2013, Thailand Agromyzidae (Diptera) — 2, Zootaxa 3746 (4), pp. 501-528 : 511-512

Melanagromyza lunulata sp. nov.

( Figs 15–18 )

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

Diagnosis. Black; mesoscutum and abdomrn greenish-lusterless; wing 1.7 mm long, calypter with fringe brown; frons narrow; parafrontalia distinctly projecting above eye in profile; lunule high; gena broad, rounded ventrally; surstylus with about 40 spines; phallus with ventral membranous part swollen, distiphallus simple.

Description. MALE. Black; ocellar triangle and dorsal parafrontalia scarcely shining; lunule sparsely grayish pruinose; gena brown-tinged; mesoscutum shining, slightly grayish-dusted, pleura more densely dusted; mesopleural suture and wing base brownish white; abdomen shining. Wing with veins pale brown but M1 and crossveins yellowish; calypter whitish-gray, with margin and fringe brown.

Frons almost as wide as eye, very slightly converging ventrally; parafrontalia distinctly and parafacialia slightly projecting beyond eye margin in profile; ors two, first ors longer than second ors; ori two, subequal to second ors in length; oh reclinate, in row; ocellar triangle with ventral tip extending slightly beyond level of first ors; lunule high, with dorsal margin situated at midway between levels of two ori; eye almost as high as wide, bare; gena rounded ventrally, about 1/4 as high as eye; pm four, two setulae above vi. First antennal flagellomere as long as wide, narrower than genal height, rounded apically, minutely pilose; arista as long as eye height, microscopically pubescent.

Mesoscutum with 0+2 dc, six to seven irregular rows of acr but four rows behind level of first dc, ia 1/2 as long as second dc, ipa 1/3 as long as opa. Wing 1.7 mm long; costa extending to M1 but very weak between apices of R4+5 and M1, with three sections in proportion of 37: 10: 8; r-m distinctly beyond midpoint of discal cell (10: 5.5); M1 ratio 4.5; ultimate section of CuA1 1/2 as long as penultimate section. Mid tibia with three short pd.

S6 about four times as long as S5, slightly wider than long, with shallow emargination posteriorly. Epandrium with surstylus almost as wide as epandrium, incurved, bearing 37–42 spines and several setae; cercus 3/4 as high as epandrium. Hypandrium 800 µm long, curved ventrally, with basal apodeme nearly 1/3 as long as sidearm; pregonite with four sensillae. Phallapodeme 700 µm long; phallic hood long (240 µm). Phallus 360 µm long, with membranous swellings on ventral side; epiphallus rather long; basiphallus U-shaped, with ventral process on left sclerite, mesophallus and distiphallus ill-chitinized; ejaculatory apodeme 160 µm long, blade narrow, gradually expanded apically, 60 µm wide.

Body length 1.8 mm.

FEMALE. Unknown.

Distribution. Thailand.

Remarks. This species is similar to Melanagromyza catalexis sp. nov. in having a swollen membranous part on the ventral side of the phallus, but differs distinctly from that species in the composition of phallic sclerites and the spinous density on the surstylus. Also, this species closely resembles M. provecta (Meijere, 1910) in the body coloration, but the pilosity of the first antennal flagellomere and the phallic structures are quite different between them (Key couplet 24; phallus of provecta, Spencer 1961 b: fig.1, as Melanagromyza communis Spencer, 1959 , syn.).

Etymology. The specific name refers to the high lunule.

Figures

FIGURES 9 – 18. Male genitalia of Melanagromyza catalexis sp. nov. (9 – 11, holotype), M. cirrappendicula sp. nov. (12 – 14, holotype) and M. lunulata sp. nov. (15 – 18, holotype). 9, 12, 15, surstylus; 10, 13, 16, phallus, lateral view; 11, 14, 17, phallus, ventral view; 18, ejaculatory apodeme, lateral view. Scale 0.1 mm.