Beardius nebularius, Pinho & Mendes & Andersen, 2013

Pinho, Luiz Carlos, Mendes, Humberto Fonseca & Andersen, Trond, 2013, Revision of Beardius Reiss et Sublette, 1985 (Diptera: Chironomidae), with the description of twenty new species, Zootaxa 3742 (1), pp. 1-78 : 49-50

Beardius nebularius sp. n.

( Figs 89–91 )

Type material. Holotype: male, BRAZIL, Santa Catarina State: Urubici, São Joaquim National Park, Morro da Igreja , Rio Pelotas , 1670 m a.s.l., S28°07'37" W49°28'47", 18.viii.2004, CDC trap, L.C. Pinho & L.E.M. Bizzo ( MZSP) . Paratypes: 1 male, as holotype ( MZSP) ; 1 male, as holotype except 18.viii–05.xii.2004, Malaise trap ( ZMBN) . 3 males, Urubici, Pousada Nossa Senhora das Graças, 900 m a.s.l., S27°59'46" W49°34'02", at light, L.C. Pinho & L.E.M. Bizzo ( MZUFBA, INPA, ZMBN) .

Diagnostic characters. The species belongs in the tupinamba group. The male can be separated from all other members of the genus by the combination of the following characters: coloration brown; R 1 bare; superior volsella with microtrichia; and projection of inferior volsella arising along basal 2/3 of the volsella, overreaching the volsella, with microtrichia and fringe of long lamellae.

Etymology. From Latin nebularius , meaning cloudy, referring to the cloud forest surrounding the type locality. Description

Male (n = 5–6, except when otherwise stated). Total length 2.93–3.28, 3.20 mm. Wing length 1.77–1.95, 1.85 mm. Total length / wing length 1.66–1.80, 1.73. Wing length / length of profemur 2.48–2.63, 2.56.

Coloration. Head and abdomen light brown. Thorax stramineous with scutum, vittae, postnotum and preepisternum light brown. Legs stramineous.

Head. AR 1.15–1.27, 1.22; ultimate flagellomere 533–642, 580 µm long. Temporal setae 10–14, 12; not well separated in inner and outer verticals and postorbitals. Clypeus with 9–13, 11 setae. Tentorium 88–139, 121 µm long; 25–35, 30 µm wide. Stipes 116–127, 121 µm long. Palpomere lengths (in µm): 30–48, 38; 38–45, 41; 96–121, 110; 126–147, 135; 157–195, 180. Third palpomere with 2 sensillae subapically, longest 10–13, 11 µm long.

Thorax. Scutal tubercle absent. Dorsocentrals 6–7, 7; acrostichals absent; prealars 2. Scutellum with 4 setae.

Wing ( Fig. 89 ). VR 1.44–1.58, 1.51. R with 3–7, 5 setae; R 4+5 with 1–2 setae at apex. Brachiolum with 2 setae. Remaining veins bare.

Legs. Spur of fore tibia (including scale) 35–50, 45 µm long; spur of mid tibia (including comb) 51–68, 59 µm long; spur of hind tibia (including comb) 53–73, 60 µm long. Width at apex of fore tibia 43–58, 53 µm; of mid tibia 45–54, 50 µm; of hind tibia 48–59, 55 µm. Lengths and proportions of legs as in Table 16.

Hypopygium ( Figs 90–91 ). Anal point bluntly triangular, 3–7, 5 µm long, not reaching posterior margin of tergite IX. Tergite IX without setae, tergal bands weak to absent. Laterosternite IX with 2–3, 2 setae. Phallapodeme 53–63, 59 µm long. Transverse sternapodeme 45–58, 52 µm long. Gonocoxite 116–154, 131 µm long. Superior volsella digitiform, 48–58, 53 µm long, with 6–8, 7 dorsal and 3–5, 4 ventral setae, with microtrichia in basal 2/3 of both dorsal and ventral surfaces. Median volsella 4–5, 4 µm long, with 2–4, 3 apical setae, longest 20–25, 23 µm long. Inferior volsella clavate, 53–66, 59 µm long, with 2 apical thin and 4–7, 5 subapical stout, bifid or trifid setae; projection arising along basal 2/3 of the volsella, with microtrichia and fringe of long lamellae. Gonostylus 126– 144, 137 µm long. HR 0.85–0.98, 0.96. HV 2.14–2.49, 2.33.

Female and immatures. Unknown.

Distribution. The species is collected in the Santa Catarina State in Brazil.

Figures

FIGURES 89–91. Beardius nebularius sp. n., male. 89—wing; 90—anal point and tergite IX and dorsal aspect of left gonocoxite and gonostylus; 91—hypopygium with anal point and tergite IX removed, left dorsal aspect, right ventral aspect.