Beardius novoairensis, 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 : 53-55

Beardius novoairensis sp. n.

( Figs 95–99 )

Type material. Holotype: male, BRAZIL, Amazonas State : Novo Airão, AM 352 Km 9, 59 m a.s.l., Igarapé no Sítio do Sr. Valdenor, #5, S02°42'00.4" W06°55'34.2", 11–14.viii.2008, Malaise trap suspended 3 m above the ground, A.M.O. Pes et al. ( MZSP) . Paratypes: 3 males, as holotype ( INPA, ZMBN, MZUFBA) .

Diagnostic characters. The species belongs in the truncatus group. The male can be separated from all other members of the genus by the combination of the following characters: tergite IX with median setae; and basal projection of the inferior volsella, parallel-sided, tapering towards apex, as long as the volsella.

Etymology. The specific epithet refers to the city of Novo Airão, where the specimens were collected.

Description

Male (n = 4, except when otherwise stated). Total length 2.26–2.67, 2.48 mm. Wing length 1.18–1.24, 1.21 mm. Total length / wing length 1.82–2.15, 2.04. Wing length / length of profemur 2.00–2.17, 2.08.

Coloration. Head, thorax and abdomen pale. Legs pale.

Head. AR 1.43–1.45 (2), ultimate flagellomere 589–637 (2) µm long. Temporal setae 9–11, 10; not well separated in inner and outer verticals and postorbitals. Clypeus with 1–14, 13 setae. Tentorium 96–109, 101 µm long; 20–28, 23 µm wide. Stipes 119–127, 121 µm long. Palpomere lengths (in µm): 33–40, 35; 33–38, 35; 89–101, 96; 96–134, 114; 164–167 (2). Third palpomere with 2 sensillae subapically; longest 6–8, 7 µm long.

Thorax ( Fig. 96 ). Scutal tubercle absent. Dorsocentrals 5–6, 6; acrostichals absent; prealars 2. Scutellum with 4–6, 5 setae.

Wing ( Fig. 95 ). VR 1.35–1.42, 1.38. R 4+5 with 1–2, 2 setae at apex. Brachiolum with 2 setae. Remaining veins bare.

Legs. Spur of fore tibia (including scale) 43–54, 48 µm long; spur of mid tibia (including comb) 86–91, 88 µm long; spur of hind tibia (including comb) 75–91, 86 µm long. Width at apex of fore tibia 37–48, 43 µm; of mid tibia 37–59, 48 µm; of hind tibia 43–48, 45 µm. Lengths and proportions of legs as in Table 18.

Hypopygium ( Figs 97–99 ). Anal point absent. Tergite IX with 2 setae, tergal bands present. Laterosternite IX with 2–3, 2 setae. Phallapodeme 40–61, 53 µm long. Transverse sternapodeme 40–46 (3) µm long. Gonocoxite 91– 106, 99 µm long. Superior volsella digitiform, curved, 38–46 (3) µm long, with 4–6 (3) dorsal, 2 (3) apical and 3 (3) ventral setae, without microtrichia. Median volsella absent. Inferior volsella slightly clavate, narrow, weakly sigmoid, 63–73, 68 µm long, with 2 apical and 2–3, 2 subapical thin setae; projection arising from base of volsella, 58–66, 63 µm long, parallel-sided, tapering towards apex, densely covered with microtrichia. Gonostylus 96–116, 109 µm long. HR 0.78–0.97, 0.90. HV 2.10–3.01, 2.50.

Female and immatures. Unknown.

Distribution. The species is collected in the Amazonas State in Brazil.

Figures

FIGURES 95–99. Beardius novoairensis sp. n., male. 95—wing; 96—thorax; 97—hypopygium, lateral view; 98—tergite IX and dorsal aspect of left gonocoxite and gonostylus; 99—hypopygium with anal point and tergite IX removed, left dorsal aspect, right ventral aspect.