Labrundinia setosa Silva

Silva, Fabio Laurindo Da, Fonseca-Gessner, Alaide Aparecida & Ekrem, Torbjørn, 2014, A taxonomic revision of genus Labrundinia Fittkau, 1962 (Diptera: Chironomidae: Tanypodinae), Zootaxa 3769 (1), pp. 1-185 : 155-157

Labrundinia setosa Silva sp. n.

( Fig. 75 )

Material examined. Type material: Holotype male, Brazil: Mato Grosso, Upper Xingu river area, Culuene river ~ 100 km down stream of confluence 7 Setembro river with Culuene river, 30.viii.1965, E. J. Fittkau ( ZSM). Paratype: 1 male same data as holotype ( ZSM).

Etymology. Named after numerous long setae on tergite IX of the adult male.

Diagnostic characters. Labrundinia setosa sp. n. differs from other Labrundinia species by the combination of the following characters. Adult male: abdominal tergites II–IV with continuous brown transverse band near proximal margin, T V–VIII almost completely brown; T IX with 16–20 posterior setae; hypopygium dark brown, sternapodeme with anterior process absent.

Description. Adult male (n = 2 unless otherwise stated)

Size. Total length 2.2–2.4 mm. Wing length 1.2–1.3 mm. Total length/wing length 1.81. Wing length/length of profemur 2.57.

Coloration. Head pale brown with dark brown occipital margin; pedicel and antenna brown; maxillary palp pale brown. Thorax golden brown with scutum dorsally light brown; antepronotum pale brown; supraalar callus brown. Wing membrane transparent without any marking. Legs pale brown. Abdomen as in figure 75L. Hypopygium dark brown.

Head ( Figs 75A–E ). Temporal setae 10, uniserial ( Fig. 75B ). Eye ratio 1.12–1.40. Tentorium ( Fig. 75C ) 153– 1.73 Μm long. Clypeus 77–84 Μm long, 63–70 Μm wide at largest part, bearing 16–18 setae. Cibarial pump 177– 208 Μm long ( Fig. 75D ), with anterior margin concave. Lengths of palpomeres 1–5 (in Μm): 34–41; 42–51; 103– 132; 131–165; 213–263. Antennal flagellum 714–839 Μm long, diameter of pedicel 127–133 Μm, apical setae single ( Fig. 75E ), AR 1.42–1.43.

Thorax. Antepronotum with 4 (1) lateral setae. Acrostichals 34–44, biserial, diverging evenly posteriorly, starting close to antepronotum and almost reaching scutellum; dorsocentrals 24–32, irregularly biserial; prealars 8– 11; supraalars 2. Anapleural suture ratio 0.41 (1). Scutellum with transverse row of 10–11 setae and group of numerous fine anterior setae.

Wing ( Fig. 75F ). Width 0.4 mm. Costa 1.0– 1.1 mm long. R2+3 present. VR 0.74 (1). WW 0.28. Brachiolum with 2 setae. Squama setiferous.

Legs ( Figs 75G–K ). Fore leg: width at apex of tibia 37–38 Μm ( Fig. 75G ), tibia with single, apical and pectinate spur 13–18 Μm long ( Fig. 75H ), with three lateral teeth and two preapical setae; ta1-4 without any preapical pseudospurs. Mid leg: width at apex of tibia 34–36 Μm long ( Fig. 75I ), tibia with single, apical and pectinate spur 19–22 Μm long with three lateral teeth ( Fig. 75J ) and two preapical setae; ta1-4 each with two preapical pseudospurs. Hind leg: width at apex of tibia 43–44 Μm long ( Fig. 75K ), tibia without spur; comb with 7 bristles; ta1-4 each with two preapical pseudospurs. Claws slender, hooked; pulvilli absent. Lengths and proportion of leg segments as in Table 51.

fe ti ta1 ta2 ta3 p1 511–473 491–439 – – –

p2 582–697 437–498 738 281 164 p3 571–499 610–674 591 731 323

ta4 ta5 LR BV SV p1 – – – – –

p2 103 101 1.48 2.98 1.62 p3 216 140 0.88 1.30 2.11 Hypopygium ( Fig. 75M ). Tergite IX arched, with 16–20 posterior setae. Membranous anal point trapezoidal, apical edge very notched. Phallapodeme 42–48 Μm long. Sternapodeme with anterior process absent. Gonocoxite cylindrical, 93–112 Μm long, 52–59 Μm wide, with slightly concave inner margin. GcR 1.77–1.88. Gonostylus simple and slender, 63–74 Μm long; megaseta 9–10 Μm long. HR 1.47–1.50. HV 3.20–3.48.

Adult female, pupa and larva. Unknown.

Remarks. Adult males of Labrundinia setosa are very similar to those of L. neopilosella and differences are discussed under this species. Labrundinia setosa has been recorded only from its type locality in Mato Grosso State, Brazil. The immature stages and their habitat remain unknown.

Figures

FIGURES 75 A – M. Labrundinia setosa Silva sp. n., adult male. A. Head, frontal view. B. Temporal setae. C. Tentorium. D. Cibarial pump. E. Apex of antenna. F. Wing. G. Apex of fore tibia. H. Fore tibial spur. I. Apex of mid tibia. J. Mid tibial spur. K. Apex of hind tibia with comb. L. Abdominal coloration pattern, dorsal aspect. M. Hypopygium, left: ventral aspect, right: dorsal aspect.