Melanagromyza catalexis Sasakawa, 2013, sp. nov.
Creators: name: Sasakawa, Mitsuhiro
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Agromyzidae
Melanagromyza
Melanagromyza catalexis

description: 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.
description: Published as part of Sasakawa, Mitsuhiro, 2013, Thailand Agromyzidae (Diptera) — 2, pp. 501-528 in Zootaxa 3746 (4) on page 508, DOI: 10.11646/zootaxa.3746.4.1, http://zenodo.org/record/216905