Toxoneura gavryushini Ozerov & Krivosheina, 2019

Ozerov, A. L. & Krivosheina, M. G., 2019, The genus Toxoneura Macquart (Diptera, Pallopteridae) of the Oriental Region, Zootaxa 4576 (3), pp. 591-595 : 591-593

Toxoneura gavryushini Ozerov & Krivosheina sp. n. ( Figs 1, 3 , 6 , 8–10 .)

MATERIAL. Holotype ♂, Vietnam: Lai Châu prov., Hoáng Liên N.P., 22.34997°N 103.76818°E, 1947 m, 19.IV.2012, D. Gavryushin ( ZMUM) . Paratypes: same labels (6 ♂♂, 2 ♀♀, ZMUM) .

DESCRIPTION. Male, female. Length of body 3.3–4.2 mm. Length of wing 3.7–5.0 mm. Body, antennae and legs pale yellow; postcranium with black spot in centre ( Fig. 3 ); male abdominal tergites 3 and 4 with indistinct blackish spots laterally; female tergites 3–5 with distinct black spots laterally, also tergite 7 and ovipositor black.

Head in profile oval, higher than long ( Fig. 1 ). Length of frons slightly more than its width. Height of gena below eye is about 1/3 of vertical diameter of eye. Head with 1 orbital, 1 ocellar, 1 outer vertical, and 1 inner vertical setae; postocellar absent. Gena and postcranium with thin black setulae. Postpedicel narrowed to the apex, approximately 1.2 times as long as wide. Arista long, short haired on whole length; the longest setulae on arista shorter than basal diameter of arista.

Thorax. Scutum shiny, covered with black setulae, with the following paired setae: 1 postpronotal, 2 equal notopleurals, 1+1 supra-alars, 2 postalars, 1+3 dorsocentrals ( Fig. 3 ). Scutellum shiny, with two pairs of setae approximately equal to each other. Pleural sclerites weakly greyish dusted. Anepisternum with several black hairs in posterior half and one strong seta near posterior margin. Katepisternum covered with rare black setulae, with one thin seta in upper posterior corner.

Legs. Fore femur with one long posteroventral seta near apex, one thin ventral seta near base, and 4–6 posterodorsal setae. Mid tibia with one ventral apical seta. Hind femur with one dorsal and one anterodorsal setae apically. Fore and hind tibiae, also mid femur without setae.

Wing with continuous longitudinal dark-brown band in upper quarter from base to tip of vein M 1 and dark-brown spot around crossvein dm-cu ( Fig. 6 ).

Abdomen covered with black setulae, without noticeable setae. Male terminalia as in Figs 8–10 ; subepandrial sclerite with 8–10 spines ( Fig. 8 ).

SIMILARITY. The new species clearly differs from the other Oriental species Toxoneura striata in the structure of head and wing pattern (see key to species below). The wing pattern of T. gavryushini is very similar to that of Palaearctic Toxoneura czurkini Ozerov, 1993 (compare Figs 6 and 5 ), but the latter species has a large black spot on postcranium ( Fig. 4 ) and scutum with two blackish bands along dorsocentral lines ( Fig. 4 ).

BIOLOGY. The specimens were collected in mountain forest by sweeping.

ETYMOLOGY. The new species is named after the collector, Dmitri I. Gavryushin.

Figures

FIGURES 1–4. Toxoneura gavryushini sp. n. (1, 3), Toxoneura striata Merz & Sueyoshi (2) and Toxoneura czurkini Ozerov (4): 1, 2—head, lateral view; 3, 4—scutum, dorsal view (2 after Merz & Sueyoshi, 2002; 4 after Ozerov, 2009).

FIGURES 5–7. Wing of Toxoneura czurkini Ozerov (5), Toxoneura gavryushini sp. n. (6) and Toxoneura striata Merz & Sueyoshi (7) (5 after Ozerov, 2009; 7 after Merz & Sueyoshi, 2002).

FIGURES 8–10. Epandrium and associated structures of Toxoneura gavryushini sp. n.: 8—ventral view; 9—dorsal view; 10—lateral view.