Pegomya curviphallis Michelsen

Michelsen, Verner, 2006, A new European species of Pegomya Robineau­Desvoidy (Diptera: Anthomyiidae) near P. flavoscutellata (Zetterstedt), Zootaxa 1257, pp. 49-55 : 51-52

Pegomya curviphallis Michelsen , sp. nov.

Figs. 1–6 , 8–9 .

‘ Pegomyia (Pegomyia) flavipalpis ( Zetterstedt, 1845) ’; Ringdahl 1938: 208, in part [Skåne, Småland provinces]. [Misidentification.]

‘ Pegomyia flavipalpis ( Zetterstedt, 1845) ’; Ringdahl 1952: 172, in part [Småland]; Ringdahl 1959: 254, in part [Småland]. [Misidentifications.]

‘ Pegomya flavoscutellata ( Zetterstedt, 1838) ’; Michelsen 1976: 72 [Faunal list: Anholt Is., Denmark]. [Misidentification.]

Etymology. The specific epithet ‘curviphallis’ is an adjective derived from the Greek ‘curvus’ and ‘phallus’ and refers to the sickle­shaped distiphallus.

Material examined. Type material. Holotype ɗ, SWEDEN: Småland: Bolmen, 24.vii.1942 (O. Ringdahl), MZLU. Paratypes 6ɗɗ: DENMARK: E Jutland: Anholt Is., 1ɗ 7–12.vii.1974 (V. Michelsen), ZMUC. FINLAND: Regio aboensis: Turku, Satava, 1ɗ 1.vii.2005 (K. Winqvist), ZMUC. SWEDEN: Småland: Sandreda, 2ɗɗ 4.vii.1927 (O. Ringdahl), MZLU; Bolmen, 1ɗ 24.vii.1942 (O. Ringdahl), MZLU; Linneryd, 1ɗ 25.vi–5.vii.1980 (V. Michelsen), ZMUC; Norrbotten: Råneå, Högsön, 1ɗ 9.vii.1975 (H. Andersson), MZLU.

Other material. FINLAND: Nylandia: Helsingin ymp., 1Ψ 11.vii.1940 (L. Tiensuu), FMNH. SWEDEN: Skåne: Hälsingborg, 1ɗ [postabdomen missing] vi.1921 (O. Ringdahl), MZLU; Småland: Kävsjö, 1Ψ 24.vii.1976 (V. Michelsen), ZMUC; Hästhult, 1Ψ 27.vii.1976 (V. Michelsen), ZMUC; Växjö, S.Åreda, 1Ψ 5.vii.1989 (R. Danielsson), MZLU; Lammhult, Os, 3ΨΨ 13–26.vii.1991 (V. Michelsen), ZMUC; Osby, Åbrolla, 1Ψ 8–14.vii.2004 (V. Michelsen), ZMUC; Värmland: Glaskogen, 1Ψ 26.vi.1978 (V. Michelsen), ZMUC.

Description. Very similar to P. flavoscutellata (Zetterstedt) and reliably separated in the male sex only. A differential description of both sexes is attempted in the following:

Male. Colour: Pruinosity of thorax and abdomen light grey or bluish grey, sometimes with a faint yellowish stain on dorsum of thorax vs. grey with a yellowish brown stain on dorsum of thorax and abdomen. Abdomen with a dark mid­dorsal stripe that is practically absent on tergites I–II, narrow on tergite III and fully developed only on tergites IV–V vs. extends to base of abdomen and is fully developed on tergites III–V.

Terminalia: Distiphallus ( Fig. 6 ) long, forming a subangular arch, long paraphallic processes slender throughout, smooth at posterior edge vs. distiphallus ( Fig. 7 ) shorter, more evenly arched, paraphallic processes wider on basal two­thirds and finely serrated on posterior edge.

Female. Colour: Ground colour of mesopleuron a mixture of dark and yellow vs. wholly dark. Pruinosity of thoracic dorsum bright yellowish vs. light grey, partially stained with brownish yellow.

Terminalia: Oviscapt ( Figs. 8–9 ) indiscernible from that of P. flavoscutellata .

Distribution. The limited available data suggests that P. curviphallis replaces P. flavoscutellata in the lowlands of northern Europe. Still, the distribution ranges of the two species very likely overlap in some places in southern Sweden and Finland.

Figures

FIGURES 1 – 5. Pegomya curviphallis sp. nov., male. 1. Sternite V. 2. Hypopygium, caudal. 3. Hypopygium, lateral. 4. Pregonite. 5. Postgonite. Scale = 0.25 mm.

FIGURES 6 – 7. Pegomya spp., male, phallus. 6. P. curviphallis sp. nov. 7. P. flavoscutellata (Zetterstedt). Scale = 0.25 mm.

FIGURES 8 – 9. Pegomya curviphallis sp. nov., female: 8. Oviscapt, flat mounted. 9. Oviscapt, distal part. Scales = 0.5 mm (8); 0.25 mm (9).