Melanagromyza spinuliloba, Sasakawa, Mitsuhiro, 2013

Sasakawa, Mitsuhiro, 2013, Thailand Agromyzidae (Diptera) — 2, Zootaxa 3746 (4), pp. 501-528 : 518-520

Malanagromyza spinuliloba sp. nov.

( Figs 37–39 )

Type material. Holotype male (QBSG), Ubon Ratchathani, Pha Taem National Park, 15˚27.435´N, 105˚34.838´E, 238 m a.s.l., 11–18 xi 2006, Malaise trap, Sorawit & Thongdee. Paratypes: 2♂, 3♀, Phetchabun, Khao Kho National Park, 16˚39.120´N, 101˚07.810´E, 246 m a.s.l., 12–19 ix 2006 & 16˚32.539´N, 102˚02.483´E, 242 m, 26 xi–2 xii 2006, Malaise trap, Somchai Chachumnan & Saink Singtong; 3♂, 5♀, Chaiyaphu, Pa Hin Ngam National Park, 15˚34.802´N, 101˚25.990´E, 430 m, 16–22 xi 2006, Malaise trap, Katae Sa-nog & Buakaw Adnafai; 2♂, same locality and collectors as holotype, 15˚27.336´N, 105˚34.870´E, 232 m, 4–11 xi 2006, Malaise trap; 1♂, 2♀, same data as holotype.

Diagnosis. Black; mesoscutum weakly and abdomen strongly shining coppery-greenish (abdomen sometimes bluish); calypter with fringe white; frons and gena narrow; surstylus with 11–14 spines on basal part of setose posteroventral projection; distiphallus with spinulose lobes at middle and membranous process dorsally before apex.

Description. MALE. Black; ocellar triangle and parafrontalia weakly shining; lunule brown-tinged, sparsely grayish pruinose; arista brown; mesoscutum slightly and abdomen strongly shining coppery. Wing with calypter white to pale yellow and fringe whitish.

Frons almost as wide as eye, slightly converging ventrally; parafrontalia not projecting above eye in profile; ors and ori each two; oh reclinate, in row; ocellar triangle with ventral tip extending beyond level of second ors or to first o r i; lunule slightly higher than semicircle; eye 1.5 times as high as wide, bare; gena 1/9 as high as eye; pm five. First antennal flagellomere small, rounded apically, rather distinctly pilose; arista slightly shorter than eye height, microscopically pubescent.

Mesoscutum with 0+2 dc, eight rows of acr. Wing 1.6–1.9 (1.7) mm long; costa extending to M1, with three sections in proportion of 30–35: 10: 8; r-m slightly beyond midpoint of discal cell (10–12: 8–10); M1 ratio 3.0– 3.9; ultimate section of CuA1 2/3–3/4 (rarely 1/2) as long as penultimate section (13–15: 20). Mid tibia with two pd.

S6 3.5 –5 times as long as S5, slightly wider than long, with median emargination on posterior 1/5. Epandrium with surstylus slightly projected posteroventrally, bearing 11–14 spines in two to three curved rows above a cluster of 15–20 setae on projection; cercus 1/2–2/3 as high as epandrium, with a row of two or three stout setae anteroventrally. Hypandrium 350–440 µm long, with sidearms broadly fused at base, apodeme 1/3–1/2 as long as sidearm. Phallapodeme 430-500 µm long; phallus 250–300 µm long, basiphallus variable in length, distiphallus with slender distal tube, a pair of small membranous lobes, which are densely covered with microscopic spinules, at middle of dorsolateral sides, and a long membranous process before dorsal apex; ejaculatory apodeme 150–170 µm long, blade slightly broadened asymmetrically, 5–100 µm wide.

Body length 1.8–1.9 (1.9) mm.

FEMALE. Similar to male, but mesoscutum and abdomen shining bluish, wing length 1.7–1.9 mm, body length 2.0– 2.2 mm.

Distribution. Thailand.

Remarks. This species belongs to the albisquama -group externally, and has a rather simple structure of the phallus as seen in Melanagromyza erawanensis Spencer. However , this species is smaller (2.1 mm in male wing length of M. erawanensis ), and its phallic structure is highly distinctive, as described above (phallus of erawanensis: Spencer 1986 : figs 5, 6). The male genitalia of M. spinuliloba also differs distinctly from that of M. turgida sp. nov. (as shown in key, couplet 12).

Etymology. The specific name refers to the spinulose lobe (Latin: spinulosus + lobus) on the distiphallus.

Figures

FIGURES 37 – 45. Male genitalia of Melanagromyza spinuliloba sp. nov. (37 – 39, paratype), M. turgida sp. nov. (40 – 42, holotype) and M. yodai Sasakawa (43 – 45).