Ophiomyia sigmoidea, Černý, 2011

Černý, Miloš, 2011, Agromyzidae (Diptera) in the vicinity of the Kerkini Lake with descriptions of eight new species from Greece, Acta Entomologica Musei Nationalis Pragae 51 (1), pp. 299-347 : 315-318

Ophiomyia sigmoidea sp. nov.

( Figs. 42–50 )

Type locality. Greece, Macedonia, Serron, Promahonas Village, 41°22′38.1′′N 23°21′58.8′′E, 60 m a.s.l.

Type material. HOLOTYPE: J, ‘ Greece: Promahonas / 41.22.38,1N/23.21.58,8E / Procom, 30.v.-5.vi.2007 / G. Ramel leg., 60 m // Project Kerkini / the biodiversity study of / Wetland Kerkini / G. Ramel leg. // Ophiomyia sigmoidea sp. nov. / det. M. Černý 2010 // Holotype’ ( NMPC). Loc. No. 32. Terminalia dissected, mounted on the same pin (medium: glycerine and gum resin).

Description (male, holotype). Head black, ocellar triangle, fronto-orbital plate and frontal vitta matt black. Antenna black, palpi brown. Thorax black, scutum and scutellum blackish brown, shining. Wing hyaline, base of wing ochre, veins brown. Calypters grey, their margin and fringe black. Halteres leathery brown. Abdomen blackish brown.

Head ( Figs. 43–44 ). Frons about as wide as 1.33 width of eye at level of anterior ocellus, slightly tapered toward lunule. Ocellar triangle and fronto-orbital plate protruding above level of frons. Ocellar triangle large, its tip reaching below level of lower ors setae. Ocelli conspicuously minute. Fronto-orbital plate narrow, each about 0.17 width of frons, distinct in profile only as narrow ring in front of eye. Lunule broad, semicircular, with longitudinal groove in middle. Two ors and two ori setae present. Orbital setulae reclinate. Arista as long as eye height, short setulose, spindle shaped, and dilated at base. Gena highest in posterior part, reaching 0.17 height of eye. Parafacialia visible only as a narrow ring above eyes. One vi seta and numerous ge setae present. Epistoma narrow.

Scutum with 0+2 dc setae, 1 st dc seta inserted in front of sa setae line. Acrostichal setulae in 8 rows anteriorly but in irregular 4–6 rows between dc setae. One short ia seta and numerous ia setulae present, 1 mspl seta and 10 setulae present. Whole surface of katepisternum with numerous setulae, 1 long stpl seta at upper margin and 4 additional setae in front of it. Scutellum broader than long in relation 1.82: 1.00, 2–3 short setulae above bs setae present. All usual setae present: 1 oc, 1 pvt, 1 vte, 1 vti, 1 ppl, 1 hu, 1+1 ntp, 1 sa, 1 prs, 1 bs, 1 as.

Wing ( Fig. 42 ) 2.60 mm long, costa reaching end of vein M 1, costal sections 2–4 in the ratio of 4.77: 1.14: 1.00. Last and penultimate sections of CuA 1 equal.

Legs. Mid tibia with 2 pd setae.

Abdomen conical, 6 th tergite 1.87 times as long as 5 th tergite, 6 th sternite as long as 6 th tergite. Male terminalia ( Figs. 45–50 ): epandrium as broad as high. Surstylus ( Fig. 50 ) with a group of uniformly long and strong spines on inner surface. Cerci very long and narrow, reaching 0.78 height of epandrium, slightly S-shaped, their ventral tips divergent. Phallus ( Figs. 45–46 ) about 0.4 length of phallapodeme, symmetrical, distiphallus complex dish-shaped, with typical surface structure. Mesophallus cylindrical, elongated distally in membranous process. Basiphallus with slightly pigmented, basally not fused, short and broad arms. Hypandrium ( Fig. 49 ) Y-shaped, with long hypandrial apodeme, deeply pigmented. Ejaculatory apodeme ( Figs. 47–48 ) 2.34 times as long as deep, blade oval, broadened at base.

Female. Unknown.

Body length 2.75 mm.

Differential diagnosis. Very minute ocelli, a narrow epistoma, 2–3 short setulae at bs setae, the whole surface of the katepisternum covered with numerous setulae and the highly species-specific male terminalia rate this species among the unmistakeable taxa. Ophiomyia sigmoidea sp. nov. belongs to the pulicaria -group characterized by the absence of the vibrissal fasciculus and the presence of the distinct keel between the antennae. Ophiomyia orbiculata ( Hendel, 1931) is probably closely related but differs by the following characters: the frons is twice as broad as the eye, the fronto-orbital plate is well differentiated and strongly projecting above the eye in profile, the 3 rd dc seta is present near the suture or two or even three smaller presutural dc setae are distinct. The male terminalia of both species are different and indicate separate species.

Etymology. This species is named according to the S-shaped (sigmoid) cercus.

Bionomics. Unknown.

Distribution. Greece: Kerkini. Hitherto known only from the type locality.

Figures

Figs. 42–44. Ophiomyia sigmoidea sp. nov., J. 42 – wing; 43 – head in frontal view; 44 – the same in lateral view. Scales = 0.5 mm (Figs. 43, 44) and 1 mm (Fig. 42).

Figs. 45–50. Ophiomyia sigmoidea sp. nov., J. 45 – phallus in lateral view; 46 – the same in ventral view; 47 – ejaculatory apodeme in lateral view; 48 – the same in dorsal view; 49 – hypandrium; 50 – epandrium, surstylus and cercus in caudal view. Scales = 0.1 mm.