Palaeoboreochlus inornatus Baranov et Andersen, 2014

Baranov, Viktor, Andersen, Trond & Perkovsky, Evgeny, 2014, A new genus of Podonominae (Diptera: Chironomidae) in Late Eocene Rovno amber from Ukraine, Zootaxa 3794 (4), pp. 581-586 : 583-584

Palaeoboreochlus inornatus Baranov et Andersen , sp. n.

( Figs 1–6 )

Type material. Holotype male, Ukraine: Pugach open-pit mine, Klesov, Rovno amber, Late Eocene ( SIZK: K- 27535).

Etymology: From Latin, inornatus , meaning unadorned, referring to the lack of megaseta or strong spines on the gonostylus.

Diagnosis. See generic diagnosis.

Description. Male (n = 1). Total length 1.88 mm. Wing length 1.51 mm. Total length / wing length 1.24. Wing length / length of profemur 4.30.

Head ( Fig. 2 ). Eye without dorsomedial prolongation. At least 2 strong orbitals, frontals not visible. Length / width of palpomeres 2–5 (in µm): 68/20, 92/26, 80/24, 100/18. Antenna ( Fig. 4 ). AR = 0.66, length of flagellomeres (in µm): 44, 36, 36, 36, 36, 40, 40, 40, 40, 40, 40, 40, 216, 92.

Thorax. With at least 14 strong dorsocentrals.

Wing ( Fig. 5 ). VR = 1.13. Costal extension 132 µm long. Distance between arculus and crossvein MCu 192 µm.

Legs. Spur of fore tibia about 28 µm long; spurs of mid tibia about 44 µm long; spurs of hind tibia about 56 µm long. Width at apex of fore tibia 28 µm, of mid tibia 30 µm, of hind tibia 36 µm. Comb of hind tibia composed of several setae, longest about 30 µm long. Length and proportion of leg segments as in Table 1 .

Hypopygium ( Figs 3 , 6 ). Tergite IX with rounded posterior margin, without anal point. Gonocoxite about 110 µm long. Gonostylus 80 µm long, 36 µm wide at base, apically conical, tapering to blunt apex.

Figures

FIGURES 1–3. Palaeoboreochlus inornatus Baranov et Andersen, gen. n., sp. n., male. 1—holotype (SZIK: K27535); 2—head; 3—hypopygium, dorsal aspect.

FIGURES 4–6. Palaeoboreochlus inornatus Baranov et Andersen, gen. n., sp. n., male. 4—antenna (flagellomeres 11–14); 5—wing; 6—hypopygium, dorsal aspect.