Thrypticus kechevi Naglis & Negrobov, 2020

Negrobov, Oleg P. & Naglis, Stefan, 2020, Two new species of Thrypticus Gerstäcker from Turkey (Diptera, Dolichopodidae) with checklist and key to Palaearctic species, Zootaxa 4858 (1), pp. 111-125 : 115-116

Thrypticus kechevi Naglis & Negrobov sp. nov.

( Figs 3–4 )

Type material. HOLOTYPE ♂: Turkey, Akyaka , pasture, 4 m, 37°03′09″N, 28°20′17″E, 23–27.ix.2012, Barták & Kubíc ( CULSP) . PARATYPE: 1 ♂, same data as holotype ( CULSP) .

Diagnosis. Antennal scape and pedicel yellow, postpedicel black, thorax and abdomen shiny metallic green, with yellow setae; legs entirely yellow; mid tibia with strong ad seta; scutellum with 2 strong marginal setae and 2 smaller lateral setae; surstylus and cercus yellow.

Description. Male. Body length (holotype): 1.8 mm, wing length 1.7 mm. Head: frons shiny metallic green, with blue reflections and weak grey pruinosity; face shiny blue, with violet reflections and dense grey pruinosity; palpus dark brown, with strong yellow seta; proboscis brown; antennal scape and pedicel yellow, postpedicel black, yellow on lateral side, roundish, as long as high; arista apical, with microscopic pubescense; postocular setae yellowish white. Thorax: mesonotum metallic green, with blue reflections and dense grey pruinosity; thoracic setae light yellow; 5 pairs of strong dc; 6–7 pairs of short ac; scutellum with 2 strong marginal setae, with 2 small lateral setae; 1 strong yellow ppl; pleura concolorous with mesonotum. Legs: coxae yellow, basal half brownish, remaining legs yellow, except tarsomere 5 brown, setae and hairs yellow except as noted. Fore leg: coxa anteriorly with small hairs and strong apical setae; remaining leg without major setae; relative podomere ratios: 32/31/16:7:5:3:4. Mid leg: coxa with some small anterior and 2 strong anterolateral setae; femur with 1 strong posterior preapical seta; tibia with 1 strong brown ad seta at 1/4 and 1 strong brown apical posterior seta; relative podomere ratios: 40/38/20:13:8:5:4. Hind leg: coxa with 2 strong lateral setae; tibia with ventral row of short erect setae and 1 small posterior apical seta; relative podomere ratios: 42/48/10:16:10:5:4. Wing: hyaline, veins light brown; basal section of M shorter than distal section; R 4+5 and M parallel; M joining costa at apex; CuAx ratio: 0.3; RMx ratio: 2.0; lower calypter yellowish white, with pale yellow setae; halter stem brown infuscated, knob yellowish white. Abdomen: shiny metallic green, with blue reflections, with pale yellow hairs and setae; tergite 8 light brown. Hypopygium ( Figs 4A, B, C ): epandrium dark brown with green reflections; cercus yellow, longer than surstylus, with long, slender apical projection; surstylus yellow, long and slender, parallel-sided, with 1 strong, yellow inwards curved ventral seta and 4 smaller apical setae; hypandrium black in basal half, yellow in apical half, asymmetric; phallus with broadened, flattened apex; epandrial lobes fused, of different length, each bearing strong apical seta. Female: unknown.

Etymology. The new species is dedicated to the Bulgarian dipterist, Mihail Kechev.

Remarks. Using the key in Negrobov & Stackelberg (1971 –77), the new species runs to T. viridis Parent , but can be distinguished by the characters given in the key below. The new species shows some similarity in the hypopygial characters with T. pruinosus ( Fig. 9C ) (see Remarks under that species) having a cercus with a strong apical projection, but the shape and chaetotaxy of the surstylus is quite different.

Figures

FIGURE 3. Thrypticus kechevi Naglis & Negrobov, sp. nov. A, habitus, left lateral; B, head; C, wing, D, postabdomen, left lateral.

FIGURE 4. Thrypticus kechevi Naglis & Negrobov, sp. nov. A, hypopygium apical part, left lateral; B, hypopygium, left lateral; C, hypopygium, ventral. (Scale bar = 0.1 mm).

FIGURE 9. Thrypticus species, A–E: hypopygia, left lateral; F: wing. A, T. subtilis Negrobov; B, T. tarsalis Parent; C, T. pruinosus Parent sensu Negrobov & Stackelberg; D, T. bellus Loew; E, T. tsacasi Negrobov; F, T. cuneatus Becker. (Figs from Negrobov & Stackelberg (1971–77)).