Pegomya prisca Michelsen

Michelsen, Verner, 2006, A new European species of Pegomya Robineau­Desvoidy (Diptera: Anthomyiidae) near P. t e s t a c e a (De Geer), Zootaxa 1260, pp. 37-46 : 39-42

Pegomya prisca Michelsen , sp. nov.

Figs. 1–7 , 14 , 16 .

‘ Pegomyia fulviceps (Zetterstedt) ’; Stein 1906: 49 [key], 59 [description]; Stein 1907: 703 in part [catalogue]. Misidentifications.

Etymology. The specific epithet ‘prisca’ is a Latin adjective meaning pristine or oldfashioned and refers to the unspecialized female oviscapt.

Material examined. Type material. Holotype ♂, SWEDEN: Halland: Simlungsdalen, Fröböke, 17–29.vii.1994 (V. Michelsen), ZMUC. Paratypes 2♂♂, 2ΨΨ: SWEDEN: Småland, Bolmen, 1♂ 20.viii.1957 (O. Ringdahl), MZLU, 1♂ 6.ix.1958 (O. Ringdahl), MZLU; Gnosjö, 1Ψ 18.x.1981 (V. Michelsen), ZMUC; NW Lake Bolmen, 1Ψ 22.ix.2002 (V. Michelsen), ZMUC.

Other material. CZECH RUPUBLIC: Horní Lomná, 49.32N 18.37E, 650m, fly trap, 2ΨΨ viii–ix.1986 (Barták), ZMUC; Šumava, Malá Niva, peat bog, 48.55N 13.49E, 780m, 1Ψ 26.ix.1992 (Barták), ZMUC. SLOVAKIA: Tatry­Tatranský Kotlina, 1km E, meadow, 49.14N 20.16E, 800m, 1Ψ 22.x.1985 (Barták), ZMUC.

Description. Overall very similar to P. testacea (De Geer) , but differs as follows:

Male. Smaller, wing length (in mm) 6.2–6.9 (n = 3) vs. 6.8–8.2 (n = 41).

Colour: Antennal postpedicel black vs. fuscous yellow. Ground colour of scutum yellowish brown, contrasting with yellow scutellum vs. scutum and scutellum concolorous, bright yellow to fuscous greyish yellow. Mid and hind femora yellow, narrowly darkened at tips vs. wholly yellow. Tarsi brown, distinctly darker than yellow femora and tibiae vs. yellow, same color as femora and tibiae. Tergites II–IV yellow, narrowly banded with black at hind margins vs. wholly yellow.

Wing: Vein C distal to subcostal break with a regular row of fine dorsal setulae vs. fine dorsal setulae of vein C very few and irregular.

Abdomen: Short, depressed abdomen parallel sided vs. ovoid.

Terminalia ( Figs 1–7 vs. 8–13): Sternite V ( Fig. 1 vs. 8) less broad basally, overall more sparsely setose and with pointed apex of lobes membranous rather than sclerotized. Outline of epandrium in caudal view rounded ( Fig. 2 ) vs. subangular ( Fig. 9 ). Cercal plate ( Fig. 3 vs. 10) less drawn out apically. Pre­ and postgonites ( Figs. 5–6 vs. 11–12) and phallus ( Fig. 7 vs. 13) differently shaped in profile view.

Female. Smaller, wing length (in mm) 6.0–7.5 (n = 6) vs. 6.2–8.6 (n = 76).

Colour: Ground colour of scutum yellowish brown, contrasting with yellow scutellum vs. scutum and scutellum concolorous, yellow or (late season only) dark brownish infuscated. Mid and hind femora yellow, narrowly darkened at tips vs. wholly yellow. Tarsi yellowish brown, darker than femora and tibiae vs. yellow, concolorous with femora and tibiae. Tergites II–IV yellow, narrowly banded with black at hind margins vs. wholly yellow or vaguely darker at hind margins (late season only).

Wing: Cross­vein dm­cu rather upright and weakly sigmoid vs. oblique and strongly sigmoid.

Terminalia: Oviscapt ( Fig. 14 vs. 15) relatively shorter: c. 2.5 mm from fore margin of tergite VI to tip of cerci when wing length = 6.4 mm vs. c. 3.2 mm when wing length = 6.8 mm; sclerotized parts dark brownish vs. light brownish yellow.

Distribution. The few existing records of P. p r i s c a from southern Sweden, Czech Republic, Slovakia and? Austria ( Stein 1906) lie within the range of P. testacea .

Figures

FIGURES 1 – 7. Pegomya prisca sp. nov., male terminalia. 1. Sternite V. 2. Hypopygium, caudal. 3. Hypopygium, lateral. 4. Phallapodeme. 5. Pregonite. 6. Postgonite. 7. Phallus. Scale = 0.25 mm.

FIGURES 14 – 15. Pegomya spp., oviscapt, flat mounted. 14. P. p r i s c a sp. nov. 15. P. testacea (De Geer). Scale = 0.5 mm.

FIGURES 16 – 17. Pegomya spp., distal part of oviscapt, flat mounted. 14. P. p r i s c a sp. nov. 15. P. testacea (De Geer). Scale = 0.25 mm.

FIGURES 8 – 13. Pegomya testacea (De Geer), male terminalia. 8. Sternite V. 9. Hypopygium, caudal. 10. Hypopygium, lateral. 11. Pregonite. 12. Postgonite. 13. Phallus. Scale = 0.25 mm.