Tanytarsus fereci Giłka, 2011, sp. nov.
Creators: name: Giłka, Wojciech
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Chironomidae
Tanytarsus
Tanytarsus fereci

description: Tanytarsus fereci sp. nov.
Type material. Holotype, No. MAI 4356, adult male, completely preserved inclusion in a light-yellow, manually ground and polished cubicoid piece (6 x 5 x 2 mm) of Baltic amber collected on the coast of the Gulf of Gdańsk.
Derivation of the name. The species name is a tribute to Mr Janusz Feręc (Elbląg, Poland) who has kindly donated the inclusion.
Diagnosis. AR 0.82. Palpus long, palp length / head length ratio c. 1.6; ultimate palpomere with strong stiff apical seta. Sc long, ending slightly distally of Cu1. VR Cu 1.26. LR1 2.44. Anal tergite with longitudinal crest-like hump bearing short median setae. Anal point slender, becoming pointed distally, bearing spinulae between long crests. Median volsella extending to more than half-length of inferior volsella.
Description. Adult male (Fig. 1 A).
Total length 1.85 mm; wing length (arculus-tip) 1.08 mm.
Head (Fig. 1 A–D). Eyes bare, reniform, with broad dorsomedian extension. Frontal tubercles unobservable. Antenna with 13 distinctly separated flagellomeres; ultimate flagellomere 360 μm long, AR 0.82, plume well developed. Palp long (c. 445 μm in total, lengths of palpomeres 2–5 in Table 2) (Fig. 1 B–D), palp length / head length ratio c. 1.6, ultimate palpomere with strong, 12 μm long, stiff apical seta (Fig. 1 D).
Thorax chaetotaxy. At least 16 acrostichals placed in double row reaching antepronotum; 7–8 dorsocentrals on each side of thorax; 4 strong scutellars in row.
Wing (Fig. 2 A). Squama bare. Wing slender, length / width ratio 3.89; anal lobe reduced. Length of M 397 μm; wing length / M length ratio 2.72. Sc long, ending slightly distally of Cu1. R1 fades before reaching C (indistinct). End of R2+3 indistinct. R4+5 ending far distally of M3+4 and slightly proximally of M1+2. FCu placed distally of RM.
Cu longer than M, VR Cu 1.26. Cu1 distinctly curved apically. Sc, M, RM, R2+3, and short proximal section of M1+2 bare, other veins with macrotrichia. Membrane setation as in most extant Tanytarsus: area above Cu bare, other cells with dense macrotrichia.
Legs (Fig. 1 A, 2B). Tibial spur and apical bristles in fore leg absent. Middle and hind leg with separated tibial combs, each composed of 10 and 12 (mid leg) or 13 and 18 (hind leg) teeth; each comb bearing slightly bent spur, 20 and 22 μm long on mid leg, 22 and 26 μm long on hind leg; spurs about twice the length of teeth (Fig. 2 B). Two or three hook-shaped sensilla chaetica on ta1 of p2. Pulvilli not observed. See Table 1 for lengths of leg segments and Table 2 for leg ratios.
fe ti ta1 ta2 ta3 ta4 ta5 p1 560 270 660 345 280 220 105 p2 595 470 310 145 120 80 60 p3 615 535 410 230 210 120 75 Hypopygium (Fig. 2 C–E). Gonostylus about 75 μm long, distinctly longer than gonocoxite, slender, slightly curved and directed posteromedially; tip blunt with apical tubercle (Fig. 2 C, D). Anal tergite with distinct longitudinal hump bearing several short median setae; anal point slender, becoming pointed distally, bearing 3 spinulae between long crests (Fig. 2 E). Superior volsella roundish, with at least 2 strong setae in apical part (well-visible in dorsolateral aspect). Digitus not observed. Median volsella well developed, extending to more than half-length of inferior volsella, about 30 μm long, stem (25 μm long) slightly curved and directed posteromedially, distal lamellae spindle-shaped (glued together with resin). Ventromedian margin of gonocoxite widely rounded. Inferior volsella stout, but reaching slightly beyond base of gonostylus, broad in proximal part, with median margin convex, narrowed in half-length, with globular distal lobe directed medially, armed with several stout setae (Fig. 2 C, D).
description: Published as part of Giłka, Wojciech, 2011, A new fossil Tanytarsus from Eocene Baltic amber, with notes on systematics of the genus (Diptera: Chironomidae), pp. 63-68 in Zootaxa 3069 on pages 63-66, DOI: 10.5281/zenodo.279021