Thrypticus caeruleus 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 : 112-114

Thrypticus caeruleus Naglis & Negrobov sp. nov.

( Figs 1–2 )

Type material. HOLOTYPE ♂: Turkey, 8 km S of Cine , river bank, 68 m, 10–12.ix.2014, 37°32′34″N, 28°03′46″E, Barták & Kubíc ( CULSP) . PARATYPE: 1 ♂, Turkey, Akyaka , pasture, 4 m, 37°03′08.9″N, 28°20′17.4″E, 16– 22.ix.2012, Barták & Kubíc ( CULSP) .

Diagnosis. Antennae black, thorax and abdomen shiny blue-violet, with yellow setae; legs dark with yellow knees; mid tibia without ad seta; scutellum with only 2 strong marginal setae; cercus yellow; surstylus slender, yellow with black apex.

Description. Male. Body length (holotype): 1.7 mm, wing length 1.3 mm. Head: frons shiny metallic green, with blue reflections and weak brown pruinosity; face shiny blue, with violet reflections and weak grey pruinosity; palpus dark brown, with small brown setae; proboscis brown; antennal segments black; postpedicel roundish, as long as high; arista apical, with microscopic pubescense; postocular setae yellowish-white. Thorax: mesonotum metallic bluish green, with violet reflections and weak grey pruinosity; thoracic setae light yellow; 5 pairs of strong dc; 6–7 pairs of short ac; scutellum with 2 strong marginal setae, without lateral setae; 1 small yellow ppl; pleura concolorous with mesonotum. Legs: coxae and femora shiny metallic green with violet reflections, apical 1/4 of femora and knees yellow, fore and mid tibiae and tarsomeres yellowish-brown, hind tibia and tarsomeres dark 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: 32/34/16:9:5:4:3. Mid leg: coxa with some small anterior and 2 strong anterolateral setae; femur with strong posterior preapical seta; tibia with 1 strong apical posterior seta; relative podomere ratios: 34/35/20:10:6:4:4. Hind leg: coxa with 2 strong lateral setae; tibia with 1 small posterior apical seta; relative podomere ratios: 39/47/14:16:9:5:5. Wing: hyaline, veins light brown; basal section of M shorter than distal section; R 4+5 and M parallel; M joining costa posteriad of apex; CuAx ratio: 0.4; RMx ratio: 2.6; lower calypter yellowish white, with pale yellow setae; halter stem brown, knob yellowish white. Abdomen: shiny metallic blue, with violet reflections, with pale yellow hairs and setae; tergite 8 dark brown. Hypopygium ( Figs 2A, B, C ): epandrium dark brown with blue reflections; cercus yellow, as long as surstylus, with small apical projection; surstylus yellow, with black apex, long and slender, parallel sided, with strong ventral and 3 small subapical setae, hypandrium black in basal half, yellow in apical half, with ventral notch; phallus slender; epandrial lobes fused, of different lengths, each bearing strong apical seta. Female: unknown.

Etymology. The name of the new species refers to its blue shiny thorax and abdomen.

Remarks. Using the key in Negrobov & Stackelberg (1971 –77), the new species runs to T. nigricauda Wood , but can be distinguished by the characters given in the key below. The male genitalia resemble that of T. divisus ( Fig. 8B ) but the new species is lacking an ad seta on the mid tibia and the apex of the surstylus is almost triangular and without notches.

Figures

FIGURE 1. Thrypticus caeruleus Naglis & Negrobov, sp. nov. A, habitus, left lateral; B, postabdomen, left lateral.

FIGURE 2. Thrypticus caeruleus Naglis & Negrobov, sp. nov. A, hypopygium, left lateral; B, hypopygium, ventral; C, hypopygium apical part, left lateral. Cer = Cercus; El = Epandrial lobes; Hyp = Hypandrium; Ph = Phallus; Sur = Surstylus. (Scale bar = 0.1 mm).

FIGURE 8. Thrypticus species, hypopygia left lateral. A, T. nigricauda Wood; B, T. divisus Strobl; C, T. laetus Verrall; D, T. altaicus Negrobov; E, T. virescens Negrobov; F, T. politus Negrobov. (Figs from Negrobov & Stackelberg (1971–77)).