A new species of Angelopteromyia Korneyev, 2001 (Diptera, Platystomatidae) from Iran, with the key to the species

Abstract Angelopteromyia korneyevi Mohamadzade Namin, sp. n. from Iran is described and figured. The new species is similar to other species of Angelopteromyia in having abdominal spiracles 5 of females not approximated medially, as well as clypeus extended postero-ventrally, antenna shorter than face, and R1 and R4+5 setulose on dorsal side. It differs from other species of Angelopteromyia by having mostly brown wing with 3 hyaline crossbands and a few hyaline spots, and dark brownish basal and costal cells without hyaline spots.


Introduction
The signal flies (Platystomatidae) are small to large-sized flies (3.5-20 mm) often with grayish microtrichose or bright and metallic blue or green body. Wings are usually strongly patterned and the cell bcu is closed by arcuate or straight vein at apex, without a posteroapical lobe (Korneyev 2001). There are about 1200 described species in 119 genera worldwide (McAlpine 2001), with about 66 species in 8 genera occurring in the Palaearctic Region (Soós 1984, Korneyev 2001). Keys to the species of the family Platystomatidae was provided by Hennig (1945); that paper is partly out-of-date now; the most comprehensive keys to the Palaearctic genera of the family were provided by McAlpine (1998) and Korneyev (2001).
While studying the tephritoid flies fauna in West Azerbaijan Province (Iran), a previously undescribed species of Angelopteromyia was collected by the first author. The new species is described and figured below.

Methods
Material is collected by standard sweeping net and minuten-pinned in side. Morphological terminology generally follows McAlpine (1981). The material examined is deposited in collections of the following institutions:  Lunule, antennal grooves and facial ridge black. Frons black, densely dark brownish tomentose, with black setulae and with shining black dots at bases of setulae and setae; ocellar triangle black. Lower two thirds of occiput conspicuously expanded posteriorly; postocellar, occipital and supracervical setulae black. Antenna black, first flagellomere rounded apico-dorsally, arista brownish black and grayish microtrichose with small pubescence. Antennae short and shorter than face, pedicel about half as long as first flagellomere, apical part of first flagellomere rounded and grayish microtrichose. Face shining black, concave in profile. Clypeus large, subshining black. Gena subshining dark brown and 1.2 times as long as first flagellomere. Sides of frons near compound eyes with triangular white microtrichose area. Anterior part of postgena around posterior margin of compound eyes with white microtrichose area that reaches to posterior margin of head. Proboscis brownish black, labellum large and black with long black setae. Palp rounded at apex, black with long black setae. Chaetotaxy: 2 orbital, 1 ocellar, 1 medial vertical, 1.15 times as long as 1 lateral vertical and 1.3 times as long as orbital setae and about twice as long as ocellar seta. All setae and setulae black.
Wing ( fig. 1) 2.4 times as long as wide, with dark brown disc, and pattern of 3 hyaline crossbands. Base of wing and costal cell dark brown. Pterostigma brown without hyaline spots. Only 2 oblique hyaline bands present in apical part of the wing: one band crossing wing from r 1 cell to posterior margin of the wing. Another hyaline band crossing wing from r 2+3 cell near terminal part of R 2+3 to posterior margin of the wing. Posterior part of apical two-thirds of cell br with oblique hyaline crossband penetrating into cell dm. Anal lobe and cubital cell light brown, containing several hyaline spots at wing posterior margin. R 1 and R 4+5 setulose dorsally with 13-21 setulae (in holotype 13 on right and 15 on left wing) in whole length of R 4+5 . Penultimate section of M 2.3 times shorter than ultimate section and 1.2 times longer than dm-cu. Lower calypter light brown with dark brown spot in middle part. Knob of halter brown, stalk yellow.
Legs with black coxae, trochanters, femora and tibiae; fore tarsus black, only basal one-fourth of first and second tarsomeres yellow. First and second tarsomeres of mid and hind tarsus yellow, remaining tarsomeres black. Fore femur subshining black and sparsely microtrichose, with long black setulae and 2 rows of ventro-lateral long black setae. All tibiae and tarsi with black setulae (fig. 11).
Abdomen: subshining black, tergite 5 of male longer than tergites 1-4 together, with shining black posterior margin. Pleura velvet grey with black hairs. Sternites dark brown; sternite 5 of male very large and broad ( fig. 6). Male terminalia as on figs3-5. Proctiger triangular, swelling part of glans about three times longer than wide. Terminal filaments of acrophallus equally thick in whole length. Surstyli with one bifurcated claw-like prensiseta visible from ventral view ( fig. 4).

Discussion
The new species is similar to other species of Angelopteromyia sharing most of generic characters, and first of all, abdominal spiracles 5 of females not approximated medially. A. korneyevi sp. n. differs from other species of Angelopteromyia in having entirely different wing pattern: dark brownish basal and costal cells without hyaline spots (in A. alf, A. chvalai and A. merzi, basal cells of wing reticulated with numerous hyaline spots). In addition, face in A. korneyevi sp. n. is completely shining black (only ventral half of face is shining black in A. merzi and half of face at least in the middle is densely microtrichose in A. alf and A. chvalai ventrally). Furthermore, the proctiger in A. korneyevi sp. n. is triangular in profile (apical part of proctiger is rounded in A. alf and A. chvalai). Acrophallic tubes in A. korneyevi sp. n. are equal in diameter and length (unequal (one thick and one thin) in A. merzi, and apically with cup-like extensions each in A. alf). Basal and costal cells dark brown and without hyaline spots ( fig. 1), face shining back, femur and tibia black, Fore femur ventro-laterally with 2 rows of slightly thickened long black setae. Male genitalia: acrophallic tubes equal in diameter and length, apex of proctiger triangular in profile ( fig. 3)  Lower half of face below antennal grooves with 2 large shining black areas; facialia strongly projected antero-laterally, genal ridge well-developed (especially in females) (Korneyev 2001: figs22-23); fore femur postero-ventrally with fine white setae. Anterior portion of mesonotum whitish setulose, with shining black anterior margin. Wing of female proximally of costagial break with large triangular projection of costal vein (Korneyev 2001: fig. 39). Abdomen whitish setulose. Male genitalia: Acrophallic tubes equally thick (Korneyev 2001: fig. 41), apex of proctiger rounded. Female abdominal pleura with bunch of long yellowish white setulae (Korneyev 2001: figs43-44