Cheilosia laeviventris Loew

Stahls, Gunilla & Barkalov, Anatolij V., 2017, Taxonomic review of the Palaearctic species of the Cheilosiacaerulescens-group (Diptera, Syrphidae), ZooKeys 662, pp. 137-171 : 153-154

Cheilosia laeviventris Loew Fig. 10

Cheilosia laeviventris Loew, 1857:602; Čepelák 1986:53; Brădescu 1991:38; Doczkal 1995:21; Barkalov and Ståhls 1997:35; Stuke 2000: 22.

Chilosia laeviventris : Becker 1894:358; Sack 1932:82; Šuster 1959:71.

Chilosia primulae Hering, 1944:117. Type locality: 'Ebenstein, Hochschwabgruppe’ [Austria]. Syn. n.

Type locality.

“Oesterreich” [sic] [Austria].

Type material studied.

C. laeviventris : Lectotype, ♂, pinned, with genitalia dissected in microvial, in ZMHU, here designated to fix the concept of Cheilosia laeviventris Loew and to ensure the universal and consistent interpretation of the same. The original description is only for the male sex. The lectotype is labelled: 'Austria, Schiner’ [handwritten, faded inc], ' laeviventris ' [handwritten, faded inc], 'coll. H. Loew’, ‘11469’, ' Cheilosia laeviventris m.' [handwritten, faded inc], ' Cheilosia laeviventris Loew, Ståhls & Barkalov des.'.

C. primulae : Lectotype, ♂, ZMHU, here designated to fix the concept of Cheilosia primulae Hering and to ensure the universal and consistent interpretation of the same. The lectotype is labelled: 'Ebenstein, Hochschwabgruppe, leg. H. Franz’, ' Cheilosia primulae m. det. Hering 1944 ' [handwritten, faded inc], 'Zool. Mus. Berlin’, 'Lectotype Cheilosia primulae Hering, Ståhls & Barkalov des.'. Genitalia dissected. A female paralectotype, idem. Both C. primulae are reared from larvae found in Primula auricola L. and the pupae are mounted on the same pin. The lectotype is forced out from the pupa: left wing missing, right wing incomplete, only with right hind leg, face slightly demolished.

Description. ♂: Face in frontal view moderately divergent from level of antennal insertion to lower mouth edge, with pollinosity, lower part of face clearly protruded (Fig. 10A). Parafacia pollinose, moderate in width, approximately 2/3 of width of basoflagellomere. Frons shining, with black pile. Frontal angle slightly> 90°. Lunula dark-brown to black. Antennal pits separated or very narrowly connected. Vertical triangle with black pile. Eye-contiguity nearly equal to or slightly shorter than length of frons without lunula. Basoflagellomere small, rounded, reddish brown to dark-brown (Fig. 10B). Arista moderately long, with short pilosity. Scutum and scutellum shining, densely punctated, with erect, mixed yellow and black pile, of about equal lengths. Central part of scutum with a rather broad transversal band of black pile. Hind margin of scutellum with black bristles or bristle-like pile. Postalar callus with some black bristles. Pleura slightly pollinose, pile predominantly black or mixed. Katepisternum with dorsal and ventral hair patches only narrowly connected anteriorly. Legs black, knees sometimes very narrowly yellowish. Apical half of posterior surface of mesofemur with long black pile, and basal part of anterior surface of metafemur with short black pile. Wing completely microtrichose, with all crossveins infuscated, R4 + 5 not distinctly curved (Fig. 10H). Abdomen shining with erect, yellow longer pile on lateral parts of tergites, and erect, black pile on central parts of tergites II–III, IV tergite with depressed pile. Tergite I–II with pollinosity medially on all length of tergite, tergite III with pollinosity only narrowly anteriorly or on all length of tergite. Tergite II often with a patch of black pile laterally. Sternites shining. Hypopygium as on Fig. 10 E–G.

♀: Face as in the ♂. Frons with pollinosity laterally, otherwise shining, pile mixed black and white (Fig. 10D). Lunula brown. Basoflagellomere small, rounded, brown to dark-brown (Fig. 10C). Arista with short pile. Scutum shining, pile as in male. Otherwise as the ♂.

Size. Body length 8-11 mm.

Material studied.

Austria 1 ♂, 2 ♀ ‘Österreich, Tirol, Seefelder Joch, 2050 m, 15.VII.1969, v. d. Goot & Lucas’ [ZMA]; Germany 5 ♂ 'Alpen Oberstdorf, Nebelhorn, Koblat, 1 920-2 220 m, 4.7.1994, D. Doczkal’ [coll. D. Doczkal].

Distribution.

Austria, France, Germany, Italy, Romania, Switzerland.