Urytalpa dorsalis ( Staeger, 1840 )

Kjaerandsen, Jostein, Martinsson, Svante, Hedmark, Kjell & Evenhuis, Neal L., 2009, On the genus Urytalpa Edwards (Diptera: Keroplatidae) in the Nordic and Nearctic regions, with fixation of a new type species and a key to world males, Zootaxa 2160 (1), pp. 29-50 : 35-36

Urytalpa dorsalis ( Staeger, 1840) , sp. restit.

( Figs 1B , 2A , 3A , 4A , 6A–D , 11A–B )

Platyura dorsalis Staeger, 1840:278

nec Platyura ochracea Meigen, 1818 authors based on Edwards (1924, 1929)

= Platyura mycetophiloides Walker, 1856:66

= Platyura nigriceps Walker, 1856:66

= Platyura humeralis Schiner, 1863:440 [ Winnertz, 1864:692]

nec Platyura ochracea ; Dziedzicki 1915:7, figs 17–18

Platyura dorsalis ; Edwards 1913:350, figs 16–17

Orfelia (Urytalpa) ochracea ; Hutson et al. 1980:38, fig. 142

Urytalpa ochracea ; Zaitzev 1994:103, fig. 41.1

Urytalpa ochracea ; Bechev & Koç 2008:31, figs 7–8

Diagnosis. This species comes closest to U. trivittata and U. atriceps in shape of the terminalia, but differs by having the thoracic stripes darker and fused in males. The gonostylus is small, tapered and claw-like in lateral view ( Figs 6C–D ), retracted and directed dorsad to the extent that it is almost totally hidden in ventral view ( Fig. 6A ). Such a small, retracted gonostylus is also found in U. trivittata and U. sapporoensis (Okada, 1938) . This is the only Nordic species of Urytalpa where the male abdomen due to the extra large anterior extension of the aedeagal apparatus ( Fig. 6C ) appears distinctly petiolated and laterally compressed ( Fig. 2A ). The female ( Fig. 3A ) can be separated from U. trivittata and U. macrocera by the combination of a short ovate sessile cercus, sternite VIII having convex apicomedial corners with a larger setose excavation, and by having globular spermathecae with thick inner wall ( Figs 11A–B ).

Description. Male (n=5). Body length 6–9, 7.5 (n=7) mm. Wing length 4.46–6.02, 5.24 mm, or 3.28–3.44, 3.36 as long as profemur. Antenna length 2.18–2.48, 2.32 mm. Coloration (specimen in alcohol, Fig. 2A ). Head dark brown, mouthparts and palps pale yellowish. Antenna dark brown, scape, pedicel and basal part of first flagellomere pale. Thorax brown with antepronotum pale; preepisternum 2 with darker lower half; laterotergite with darker posteroventral part; mesonotal stripes dark, almost completely fused, separated anteriorly; humeral area pale, extending laterally to behind wing base. Wings clear, yellow tinged, veins brown. Halter pale. Legs pale whitish yellow. Abdomen dark brown with variable amount of yellow; tergites I–V usually with large triangular apicolateral yellow marking; tergites VI–IX darker, with at most small yellow patches laterally on tergites VI–VII; sternites I–VI pale; terminalia dark brown. Terminalia ( Fig. 6 ). Gonocoxites fused ventrally by a broad connection; apically with a short apicomedial outgrowth without strong setae. Large hypandrial lobe forming thin hyaline plate ventromedially. Gonostylus retracted into gonocoxite, small and claw like in lateral view with the tip pointing apicoventrally. Aedeagal apparatus very large, with compressed plate large and tall, extending anteriorly into segment V, and long associated apodemes laterally. Tergite IX without outgrowths, apical corner with patch of short internal setae; with shallow posterior and deep anterior U-shaped incision. Proctiger small and short, cercus oblong in lateral view.

Female (n=2). Body length 7.5 mm. Wing length 5.68–5.9 mm, or 3.38–3.6 as long as profemur. Antenna length 1.75 mm. Coloration ( Fig. 3A ). Thorax usually all yellow without dark markings; abdomen variable from all dark to entirely yellow; otherwise as in male. Terminalia ( Figs 11A–B ). Cercus short ovate and sessile. Sternite VIII with convex corners, with a large excavation apicomedially covered with short stiff setae. Spermathecae globular, spermathecae and ducts with thick inner walls.

Distribution. Widespread in Europe; recorded from Belgium, Bulgaria, Czech Republic, Denmark, Finland, France, Germany, Great Britain, Hungary, Ireland, Italy, Latvia, Netherlands, Norway, Poland, Romania, Russia (NET), Slovakia, Spain, Sweden and Switzerland.

Type material examined: Holotype male, DENMARK (without given locality) June 14 (year not given, before 1840) [ ZMUC, leg. R. C. Staeger, JKJ-SPM-033574, Fig. 1B ].

Other material examined: NORWAY: TEI, Kviteseid, Kviteseid , 59°24'11"N, 008°29'38"E, 150 m a.s.l., 15–16 Jun 1988 ( ZMUN, Leg. S. Ligaard) — 1 male ; SWEDEN: BO, unknown locality ( NHRS, Leg. C. H. Boheman) — 1 female, 1 male ; HA, Halmstad, Strandskogen, Eldsberga , 56°40'45"N, 012°42'56"E, 8 Jun 1952 ( MZLU, Leg. P. Ardö) — 1 male ; LY, Ammarnäs, Kaissats sydslutning, 600 m a.s.l., 27 Jul 1957 ( MZLU, Leg. Unknown) — 1 female ; NB, Pajala, Kengis, Utmockan , 67°11'16"N, 023°29'23"E, 15 Jul 1951 ( MZLU, Leg. Ander & Ardö) — 1 male ; ÖG, Sturefors Nature Reserve , 58°19'43"N, 015°46'08"E, 15 Jun 1990 ( MZLU, Leg. M. Wadstein) — 2 males ; 6 Jul 1990 ( MZLU, Leg. M. Wadstein) — 1 male ; SK, Lomma, pine forest at Habo gård N Lomma , 55°41'24"N, 013°03'50"E, 10 m a.s.l., 23 May 2004 ( MZLU, Leg. J. Kjaerandsen) — 1 male ; Dalby, Ö. Mölla , 55°39'47"N, 013°21'22"E, 28 May 1989 ( MZLU, Leg. R. Danielsson) — 1 male ; 7 Jun 1989 ( MZLU, Leg. R. Danielsson) — 1 female, 1 male ; Kristianstad, Arkelstorp , 56°10'13"N, 014°17'09"E, 26 Jun 1919 ( MZLU, Leg. Unknown) — 1 female ; SM, unknown locality ( NHRS, Leg. C. H. Boheman) — 1 female ; Högsby, Emån at Berga Gård , 57°08'48"N, 016°03'21"E, 17 May–19 Jul 2006 ( MZLU, Leg. A. Malmqvist) — 1 male ; Markaryd , Jul 1929 ( MZLU, Leg. O. Ringdahl) — 1 male ; Bolmen , 1 Jul 1957 ( MZLU, Leg. O. Ringdahl) — 1 male ; Markaryd, Traryd, Axhult , 56°30'26"N, 013°39'55"E, Jul 1952 ( MZLU, Leg. G. Olsson) — 1 male ; Aug 1952 ( MZLU, Leg. G. Olsson) — 3 males ; Torsås, Torsås , 56°24'51"N, 015°59'53"E, 10 Jun 1985 ( MZLU, Leg. R. Danielsson) — 1 female, 2 males ; SÖ, Haninge, Tyresta National Park , 59°11'11"N, 018°18'19"E, Erikslund ( NHRS, Leg. B. Viklund) — 1 female ; 26 May–30 Jul 2001 ( NHRS, Leg. B. Viklund, L. O. Wikars & H. Ahnlund) — 2 males ; UP, Uppsala, Ekdalen Nature Reserve , southern hillside, 59°58'17"N, 018°21'18"E, trap id. 27-487, 2–16 Jun 2004 ( NHRS, Leg. Swedish Malaise Trap Project) — 3 females, 60 males .

Figures

FIGURE 1. Type material studied. — A. Type series of Platyura ochracea Meigen, 1818 at the MNHN collections in Paris. 1 = male with cleared abdomen in glycerine in separate microvial. This specimen is in best agreement with the original description and selected as the lectotype for Orfelia ochracea (Meigen, 1818) comb. n. = Orfelia unicolor (Staeger, 1840) syn. n. 2 = Orfelia sp. lacking abdomen. 3 = female Neoplatyura cf. flava (Macquart, 1826). — B. Male holotype of Urytalpa dorsalis (Staeger, 1840) sp. restit. from the ZMUC collections in Copenhagen. This specimen in near perfect condition (only lacking right mid leg beyond trochanter) is designated as the new type species for Urytalpa due to original misidentification of Platyura ochracea Meigen, 1818 by Edwards (1924, 1929).

FIGURE 2. Habitus photos of males of Nordic species of the genus Urytalpa Edwards. — A. Urytalpa dorsalis (Staeger, 1840). — B. Urytalpa trivittata (Lundström, 1914). — C. Urytalpa atriceps (Edwards, 1913). — D. Urytalpa macrocera (Edwards, 1913). — E. Urytalpa galdes Hedmark & Kjaerandsen sp. n.

FIGURE 3. Habitus photos of females of Nordic species of the genus Urytalpa Edwards. — A. Urytalpa dorsalis (Staeger, 1840). — B. Urytalpa macrocera (Edwards, 1913).

FIGURE 4. Wing photos of males of Nordic species of the genus Urytalpa Edwards. — A. Urytalpa dorsalis (Staeger, 1840). — B. Urytalpa trivittata (Lundström, 1914). — C. Urytalpa atriceps (Edwards, 1913). — D. Urytalpa macrocera (Edwards, 1913). — E. Urytalpa galdes Hedmark & Kjaerandsen sp. n.

FIGURE 6. Male terminalia of Urytalpa dorsalis (Staeger, 1840). — A. Sternite IX and hypandrial lobe in ventral view. — B. Tergite IX, proctiger and cerci in dorsal view. — C. Segment IX and beyond in lateral view, including internal aedeagal apparatus (pre-terminal segments not illustrated). — D. Gonostylus in lateral view, enlarged.

FIGURE 11. Female terminalia and spermatheciae of Urytalpa species (pre-terminal segments not illustrated). — A. U. dorsalis (Staeger, 1840) in lateral view. — B. U. dorsalis, ventral view of sternite VIII. — C. Urytalpa trivittata (Lundström, 1914) in lateral view. — D. U. trivittata, ventral view of sternite VIII. — E. Urytalpa macrocera (Edwards, 1913) in lateral view. — F. U. macrocera, dorsal view of sternite VIII.