Melanagromyza catalexis, Sasakawa, Mitsuhiro, 2013

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

Melanagromyza catalexis sp. nov.

( Figs 9–11 )

Type material. Holotype male (QBSG), Sakon Nakhon, Phu Phan National Park, 16˚54.713´N, 103˚54.294´E, 289 m a.s.l., 13–19 xi 2006, Malaise trap, Winlon Khongnara.

Diagnosis. Black; mesoscutum subshining, without metallic luster; abdomen shining coppery; wing length 1.9 mm, calypter with fringe pale brown; frons and gena narrow; acr in ten dense rows; S6 with deep incision posteromesally; surstylus with 16 long spines; phallus with membranous part extensively swollen ventrally.

Description. MALE. Black; ocellar triangle matt; lunule brown-tinged, grayish pruinose; arista brown; mesoscutum almost metallic-lusterless, abdomen strongly shining metallic-coppery. Wing hyaline, calypter brownish white, with margin dark brown, fringe pale brown.

Frons slightly wider than eye, converging ventrally; parafrontalia not projecting above eye in profile; ors and ori each two; oh reclinate, in row; ocellar triangle small, with ventral tip not extending beyond level of second ors; lunule semicircular; eye almost 1.3 times as high as wide, bare; gena narrow, about 1/10 as high as eye. First antennal flagellomere almost twice as wide as gena, rounded apically, minutely pilose; arista slightly longer than eye width, microscopically pubescent.

Mesoscutum with 0+2 dc, ten rows of acr. Wing 1.9 mm long; costa extending to M1, with three sections in proportion of 36: 10: 9; r-m beyond middle level of discal cell (14: 9); M1 ratio 4.0; ultimate section of CuA1 3/4 as long as penultimate section. Mid tibia with two pd.

S6 2.8 times as long as S5, 1.4 times as long as wide, with median incision on posterior 1/2. Epandrium with surstylus broadly projected (almost as wide as epandrium), incurved anteroventrally, bearing 16 long spines; cercus long, 3/4 as high as epandrium. Hypandrium 320 µm long, with basal apodeme about 1/3 as long as sidearm. Phallapodeme 520 µm long; phallus 320 µm long, with ventral membranous part distinctly expanded ventrally; basiphallus short, distal tube of mesophallus+dsistiphallus elongated, ending in small bulb, distiphallus with dorsoproximal lobe distinctly spinose; ejaculatory apodeme 230 µm long, blade narrow, only 60 µm wide distally.

Body length 2.1 mm.

FEMALE. Unknown.

Distribution. Thailand.

Remarks. This species is similar to Melanagromyza oculata Sasakawa (1963c) , known from New Britain, in having a dark fringe on the calypter and a spinose distiphallus, but it is clearly distinguished by having a bare eye, a deeply incised S6, sparsely spinose surstylus, and a long distiphallic tube with small bulb apically. In M. oculata , the eye has a patch of white hairs anterodorsally, S6 is incised only on the posteromedian 1/5, the surstylus bears about 42 spines, and the distal tube of distiphallus is not swollen apically (Sasakawa 1963c: fig. 9).

Etymology. The specific name refers to the characteristic distal end (Greek: katalexis) of the meso+distiphallus.

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.