Japanagromyza hymenoedemia, Sasakawa, Mitsuhiro, 2010

Sasakawa, Mitsuhiro, 2010, A review of the Oriental Japanagromyza Sasakawa (Diptera: Agromyzidae), with descriptions of four new species, Zootaxa 2485, pp. 16-32 : 25

Japanagromyza hymenoedemia sp. nov.

( Figs. 14–16 )

Diagnosis. This species is characterized by a yellow halter, densely spinose surstylus, short hypophallus and two tubules of the distiphallus surrounded with large membranous lobes.

Description. MALE. Black; parafrontalia weakly shiny; antenna brownish black; thorax very slightly grayish pollinose, mesoscutum shiny; abdomen strongly shiny. Wing with calypter brownish gray, black along margin, and fringe brown; halter yellow, stalk slightly brown tinged.

Frons only a little wider than eye; basal swellings of ors sockets projecting above eye in profile; lunule lower than semicircle; eye 1.3 times as high as broad; gena 1/10 as high as eye. First antennal flagellomere as long as wide (arista missing).

Mesoscutum with eight rows of acr, prsc weaker than anterior dc. Wing 1.9–2.0 (2.0 in holotype) mm long, costa with three sections in proportion of 3.4: 1: 0.7, r-m at basal 1/3 of discal cell (5: 9–10), ultimate section of M1 2.5–2.7 times as long as penultimate, ultimate section of CuA1 3/4 as long as penultimate. Fore tibia with lateral bristle.

S6 about 1.5 times as wide as long, four times as long as S5. Genitalia: Epandrium slightly projected on median dorso-caudal apex; surstylus long, broadly lobate in lateral view, bearing 18–20 spines; cercus almost as high as epandrium; hypandrium very long (800 µm), Y-shaped, with basal apodeme slightly shorter than sidepiece; phallapodeme 750 µm long; phallus 440 µm long, basiphallus bifurcate distally, hypophallus short, narrow, and weakly chitinized, distiphallus with distal tubules curved dorsally at ends and surrounded by membranous lobes which are covered with transparent spinules on dorsal side; ejaculatory apodeme 260 µm long, blade narrow (60 µm wide).

Body length 2.0– 2.2 mm.

FEMALE and HOSTPLANT. Unknown.

Type Material. Holotype 3 ( BPBM 17133), Thailand, Chiangdao, 5–11. IV. 1958, T.C. Maa. Paratype: 3, Thailand, Chiangmai Prov., Fang, 12–19. IV. 1958, Maa ( BPBM).

Distribution. Thailand.

Remarks. This species is similar to Japanagromyza stylata Sasakawa in the coloration, wing venation, and phallic structure, but differs distinctly from it in the shape and spinosity of the surstylus, and the distiphallic structure: in stylata , the surstylus is long cylindrical, bearing only two apical spines, and the distiphallic tubules are naked ( Sasakawa 1963a: Fig. 5).

Etymology. The specific name refers to the membranous tumour (Greek: hymenion + oidema) of the distiphallus.

Figures

FIGURES 14 – 20. Male genitalia of Japanagromyza hymenoedemia sp. nov. (14 – 16, holotype) and J. intricata sp. nov. (17 – 20, holotype). 14, 17, epandrium, cercus, surstylus; anterior view; 15, 19, phallus, lateral view; 16, 20, ejaculatory apodeme; 18, hypandrium, ventral view. Scale = 0.1 mm.