Labrundinia hirsuta Roback 1987

Abstract

Labrundinia hirsuta Roback, 1987 (Fig. 23) Labrundinia hirsuta Roback, 1987: 221 (description of male). Material examined. Type material: Holotype male, Colombia: Departamento del Meta, Puerto López, Laguna Mozambique, 16 km s. w. of Puerto López, 25.ii. 1972, N. R. Foster (ANSP). 4 Paratypes: 1 male same data as holotype except for 6.iii. 1971 (ANSP). 3 male same data as holotype except for 9.iii. 1971 (ANSP). Diagnostic characters. Labrundinia hirsuta differs from other Labrundinia species by the combination of the following characters. Adult male: abdominal tergites I–II pale, T II-V with narrow, laterally tapered band T VI with U-shaped band, T VI–VIII almost completely brown; hypopygium pale, sternapodeme with distinct anterior process. Adult male (n = 5 unless otherwise stated) Size. Total length 2.1–2.5 (2) mm. Wing length 1.2–1.3 (4) mm. Total length/wing length 2.04–2.15 (2). Wing length/ profemur length 2.81–3.11 (3). Coloration. Head brown with dark brown occipital margin; pedicel and antenna brown; maxillary palp pale. Thorax dark brown; antepronotum pale; supraalar callus dark brown. Wing membrane transparent with one median band present, about ⅔, formed mostly by dark hairs. Legs pale brown. Femur I with apex brown, Fe II–III brown. Tibia I with apex and base brown, Ti II pale, Ti III with apex brown. Tarsomere 1 with apex brown, tarsomeres 2–5 pale brown. Abdominal tergites I–II pale, II-V with narrow, laterally tapered band T VI with U-shaped band, T VI– VIII almost completely brown; hypopygium pale (Fig. 23 L). Head (Figs 23 A–E). Temporal setae 10–15, uniserial (Fig. 23 B). Eye ratio 1.18–1.50. Tentorium (Fig. 23 C) 112–147 Μm long. Clypeus 98–125 (4) Μm long, 69–88 Μm wide at largest part, bearing 16–19 setae. Cibarial pump 161–170 (4) Μm long (Fig. 23 D), with anterior margin concave. Lengths of palpomeres 1–5 (in Μm): 33–37 (4); 49–65; 118–133; 137–159 (4); 233–239 (4). Antennal flagellum 843–857 (4) Μm long, diameter of pedicel 107– 119 (3) Μm, apical setae single (Fig. 23 E), AR 1.52–1.55 (2). Thorax. Antepronotum with 5–6 (4) lateral setae. Acrostichals 40–44 (4), biserial, diverging evenly posteriorly, starting close to antepronotum and almost reaching scutellum; dorsocentrals 20–22, irregularly biserial; prealars 8–9 (4); supraalars 3 (4). Anapleural suture ratio 0.46–0.52. Scutellum with transverse row of 8–10 setae and group of numerous fine anterior setae. Wing (Fig. 23 F). Width 0.3–0.4 (4) mm. Costa 1.0– 1.1 (4) mm long. R 2 + 3 present. VR 0.72–0.77 (4). WW 0.27–0.31 (4). Brachiolum with 2 setae (3). Squama setiferous. Legs (Figs 23 G–K). Fore leg: width at apex of tibia 31–39 Μm (Fig. 23 G), tibia with single, apical and pectinate spur 13–16 (3) Μm long (Fig. 23 H), with four and two preapical setae; ta 1 with two preapical pseudospurs. Mid leg: width at apex of tibia 31–39 (4) Μm long (Fig. 23 I), tibia with single, apical and pectinate spur 16–25 (3) Μm long with four teeth (Fig. 23 J) and two preapical setae; ta 1-4 each with two preapical pseudospurs. Hind leg: width at apex of tibia 39 (2) Μm long (Fig. 23 K), tibia without spur; comb with 8 (4) bristles; ta 1 with two preapical pseudospurs. Claws slender, hooked; pulvilli absent. Lengths and proportion of leg segments as in Table 15. fe ti ta 1 ta 2 ta 3 p 1 422–481 438–481 273–297 (2) 188–195 (2) 125–141 (2) p 2 602–688 503–523 581 (1) 259 (1) 141 p 3 523–546 (3) 643 (1) 555 (1) 281 (1) 184 (1) ta 4 ta 5 LR BV SV p 1 94–96 (2) 63 (2) 0.55–0.62 (2) 2.42–2.62 (2) 3.02–3.62 (2) p 2 95 (1) 78 (1) 1.16 (1) 2.97 (1) 1.95 (1) p 3 133 (1) 86 (1) 0.86 (1) 2.54 (1) 2.13 (1) Hypopygium (Fig 23 M). Tergite IX arched, with 12–13 posterior setae. Membranous anal point trapezoidal, slightly concave. Phallapodeme 55–67 (2) Μm long. Sternapodeme with distinct anterior process. Gonocoxite cylindrical, 137–151 Μm long, 62–75 Μm wide. GcR 1.89–2.40. Gonostylus simple and slender, 86–92 Μm long; megaseta, 16–18 (3) Μm long. HR 1.55–1.75 (4). HV 2.44 (1). Adult female, pupa and larva. Unknown. Remarks. Adults of Labrundinia hirsuta can easily be separated from all other Labrundinia species by the narrow transverse, laterally tapered band on abdominal tergite V and U-shaped band on tergite VI. Labrundinia hirsuta has been recorded only from its type locality in Colombia. The adults were collected in the area of Laguna Mozambique, which is characterized by the presence of Scirpus cubensis and Pastalum repens along the shore and pH around 4.5. The larvae from this area described by Roback (1987 a) could not with certainty be associated with the adults. Thus, the immatures of L. hirsuta remain unknown.Published as part of Silva, Fabio Laurindo Da, Fonseca-Gessner, Alaide Aparecida & Ekrem, Torbjørn, 2014, A taxonomic revision of genus Labrundinia Fittkau, 1962 (Diptera: Chironomidae: Tanypodinae), pp. 1-185 in Zootaxa 3769 (1) on pages 51-54, DOI: 10.11646/zootaxa.3769.1.1, http://zenodo.org/record/25072