You are here
Classification
Urytalpa dorsalis (Staeger, 1840)
Urytalpa dorsalis (Staeger, 1840)
General description:Description based on Kjærandsen et al (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
Diagnostic description: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 lateralview, retracted and directed dorsad to the extent that it is almost totally hidden in ventral view. 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 appears distinctly petiolated and laterally compressed. The female 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.
Morphology:Male (n=5). Body length 6–9, 7.5 (n=7) mm. Wing length 4.46–6.02, 5.24 mm, or3.28–3.44, 3.36 as long as profemur. Antenna length 2.18–2.48, 2.32 mm.
Coloration (specimen in alcohol). 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) 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 apparatusvery 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 lateralview.
Female (n=2). Body length 7.5 mm. Wing length 5.68–5.9 mm, or 3.38–3.6 as long as profemur. Antennalength 1.75 mm.
Coloration. Thorax usually all yellow without dark markings; abdomen variablefrom all dark to entirely yellow; otherwise as in male.
Terminalia. Cercus short ovate andsessile. 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.
Distribution of Urytalpa dorsalis
Recent content