Labrundinia amazonica 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 : 16-18

Labrundinia amazonica Silva sp. n.

( Fig. 4 )

Material examined. Type material: Holotype male, Brazil: Amazonas, Manacapuru, Cabaliana lake, 16.vi.1971, F. Reiss ( ZSM).

Etymology. Derived from Amazonia, referring to the type locality in the Amazonian region in northern Brazil.

Diagnostic characters. Labrundinia amazonica sp. n. differs from other Labrundinia species by the combination of the following characters. Adult male: abdomen completely brown; hypopygium brown, gonostylus with a concave depression apically, sternapodeme with reduced anterior process.

Description. Adult male (n = 1)

Size. Total length 2.3 mm. Wing length 1.1 mm. Total length/wing length 2.04. Wing length/ profemur length 1.77.

Coloration. Head pale brown with dark brown occipital margin; pedicel and antenna brown; maxillary palp pale brown. Thorax golden brown; antepronotum pale brown; supraalar callus brown. Wing membrane transparent without any marking. Legs brown. Abdomen including hypopygium brown ( Fig. 4J ).

Head ( Figs 4A–E ). Temporal setae 10, uniserial ( Fig. 4B ). Eye ratio 1.12. Tentorium ( Fig. 4C ) 150 Μm long. Clypeus 68 Μm long, 58 Μm wide at largest part, bearing 13 setae. Cibarial pump 136 Μm long ( Fig. 4D ), with anterior margin concave. Lengths of palpomeres 1–3 (in Μm): 31; 54; 81. Antennal flagellum 805 Μm long, diameter of pedicel 91 Μm, apical setae single, AR 1.35 ( Fig. 4E ).

Thorax. Antepronotum lateral setae not observed. Acrostichals 40, biserial, diverging evenly posteriorly,

starting close to antepronotum and almost reaching scutellum; dorsocentrals 22, irregularly biserial; prealars 7; supraalars not observed. Anapleural suture ratio 0.33. Scutellars not observed. Anepisternals, preepisternals and postnotals absent.

Wing ( Fig. 4F ). Width 0.3 mm. Costa 1.0 mm long. R2+3 present. VR 0.78. WW 0.28. Brachiolum with 2 setae. Squama setiferous.

Legs ( Figs 4G–I ). Fore leg: width at apex of tibia 43 Μm ( Fig. 4G ), tibial spur and preapical setae not observed; preapical pseudospurs not observed. Mid leg: width at apex of tibia 37 Μm long ( Fig. 4H ), tibial spur and preapical setae not observed; preapical pseudospurs not observed. Hind leg: width at apex of tibia 38 Μm long ( Fig. 4I ), tibia without spur; comb with apparently 4 bristles; preapical pseudospurs not observed. Lengths and proportion of leg segments as in Table 4.

fe ti ta1 ta2 ta3 p1 642 473 – – – p2 608 493 – – – p3 529 655 – – –

ta4 ta5 LR BV SV p1 – – – – – p2 – – – – – p3 – – – – – Hypopygium ( Fig. 4K ). Tergite IX arched, with 10 posterior setae. Membranous anal point rounded apically. Phallapodeme 52 Μm long. Sternapodeme with reduced anterior process. Gonocoxite cylindrical, 116 Μm long, 52 Μm wide, with slightly concave inner margin. GcR 2.23. Gonostylus with a concave depression apically, 79 Μm long; megaseta 12 Μm long. HR 1.47. HV 2.95.

Adult female, pupa and larva. Unknown.

Remarks. Adult males of Labrundinia amazonica appear most similar to those of L. becki and L. parabecki in the abdominal coloration. However, a very distinct gonostylus with an internal depression subapically is present in L. amazonica in contrast to the straight gonostylus in the other Labrundinia species. Labrundinia amazonica has been recorded only from its type locality in Amazon rainforest. The immature stages and their habitat remain unknown.

Figures

FIGURES 4 A – M. Labrundinia amazonica 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. Apex of mid tibia. I. Apex of hind tibia with comb. J. Abdominal coloration pattern, dorsal aspect. K. Hypopygium, left: ventral aspect, right: dorsal aspect.