Wiedemannia pseudoberthelemyi Ivkovic & Sinclair

Ivkovic, Marija, Cevid, Josipa, Horvat, Bogdan & Sinclair, Bradley J., 2017, Aquatic dance flies (Diptera, Empididae, Clinocerinae and Hemerodromiinae) of Greece: species richness, distribution and description of five new species, ZooKeys 724, pp. 53-100 : 59-61

Wiedemannia pseudoberthelemyi Ivkovic & Sinclair sp. n. Figs 1, 3, 10

Type locality.

Greece: Etolia, River Mornos, Nafpaktos, 38°23'N, 21°51'E.

Type material.

Holotype ♂ (in 80% ethanol), labelled: "HOLOTYPE/ Wiedemannia // pseudoberthelemyi IVKOVIĆ // et SINCLAIR/, GREECE, Etolia,// River Mornos,/ Nafpaktos,/ 38°23'N, 21°51'E, 23.iv.1990,// leg. B. Horvat, I. Sivec" (UZC). Paratypes: same data as holotype (1 ♂, 3 ♀, UZC; 3 ♂, 6 ♀, CNC, dried from alcohol).

Additional material.

GREECE: Central Greece, Panaitoliko Mts., R. Tavropos, Kalesmeno, 300 m, 38°56'N, 21°40'E, 29.iv.1989 (SMNH); Central Greece, Etolia, Agrinio, Agia Soufia, 100 m, 38°36'N, 21°26'E, 24.iv.1990 (SMNH); Etolia, Vardousia Mts., R. Evinos, Grammeni Oxia, 800 m, 38°43'N, 22°00'E, 28.iv.1990 (SMNH).

Diagnosis.

This species of Wiedemannia is distinguished by the long gena and the mitten-shaped clasping cercus, which is extremely similar to that of Wiedemannia (Chamaedipsia) berthelemyi Vaillant & Vinçon, 1987.

Description.

Male. Body length 3.5-4.1 mm, wing length 3.5-3.6 mm (colouration bleached by prolonged storage in alcohol). Head (Fig. 3) in lateral view higher than long; gena broad, three-quarters height of eye. Frons short, broader than face. Face wide, with distinct carina on lower margin, bare, lacking setae. One pair of short ocellar setae and one pair of vertical setae; about 6 distinct upper postocular setae; lower postocular setae finer and merging with longer setae on middle and lower occiput; few small setulae present on vertex and between ocellar area. Antenna brown; postpedicel and stylus minutely pubescent; scape longer than pedicel, with setulae dorsally; pedicel with complete circlet of apical setae; postpedicel apically pointed; stylus nearly twice length of postpedicel.

Mesonotum with 5 pairs of dorsocentral setae with short setulae interspersed. Acrostichal setae short and fine, biserial, extending to prescutellar depression; 1 strong postpronotal seta; 2-3 notopleural setae and several short setae of variable size; 1 presutural supra-alar seta and numerous small setulae; 1 postalar seta. Antepronotum with 1 pair of strong setae and a few shorter setae. Proepisternum with some fine setulae. Katepisternum with a few (1-3) setulae. Laterotergite with fine, pale setae. One pair of strong marginal scutellar setae with many scattered setae on disc.

Wing membrane infuscate, veins darker; 1 short basal costal seta ending before humeral crossvein. Cell dm produced anteroapically. Veins M1 and M2 originating together with short stem vein proximal to M1+2 fork. Vein CuA+CuP extremely faint. Pterostigma elongate, indistinct. Squama with setulae. Halter yellowish.

Legs mostly brown; fore femur with 1 strong preapical anterior seta; uniformly covered with rows of small dark setulae. All coxae with longer setae anteriorly. Fore and mid femora ventrally with some longer setulae on proximal half.

Abdomen concolourous with thorax, covered in short setae. Pubescence darker on tergites than sternites. Terminalia (Fig. 10): hypandrium subequal in length with epandrium, with 6 pairs of setae. Epandrium irregularly subquadrate, with 2-3 stouter and longer setae (shown by enlarged sockets) in addition to regular setae ventrally and laterally; surstylus very slender, hook-shaped. Clasping cercus yellowish-brown, broad, mitten-shaped, with thumb-like anterior lobe; posterior lobe truncate apically; thumb-like lobe with long outer setae; stout setae with multi-branched apex covering most of inner face of cercus. Phallus more or less linear, slender; distiphallus with swelling at mid-length.

Female. Similar to male. Terminalia: cercus short ovate and minutely pilose.

Etymology.

The species name is derived from the name Wiedemannia (Chamaedipsia) berthelemyi because of the similarity of the clasping cercus with that of this species.

Remarks.

Wiedemannia pseudoberthelemyi sp. n. is known only from parts of Greece. This new species differs from W. berthelemyi on the basis of the truncate pos terior lobe of the clasping cercus (pointed in W. berthelemyi ) and in having only a single preapical seta on the fore femur (2 in W. berthelemyi ). The odd stout setae with multi-branched tips on the inner face of the clasping cercus were not noted by Vaillant and Vinçon (1987) and the absence of the swelling on the distiphallus ( Vaillant and Vinçon 1987, fig. 32) is likely an artefact caused by the acid clearing process. The holotype of W. berthelemyi was not examined.

Additional similar species that could be included in this group based on the shape of the clasping cercus include: W. angelieri Vaillant, 1967 (Pyrenees), W. vedranae Ivković & Sinclair, 2014 (Sierra Nevada, Spain), and W. queyrasiana Vaillant, 1956 (European Alps).