Beardius abbadi, 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 : 18-20

Beardius abbadi sp. n.

( Figs 13–15 )

Type material. Holotype: male, BRAZIL, Amazonas State : Novo Airão, AM 352 Km 9, 123 m a.s.l., “Igarapé no Sítio do Sr. Valdenor”, #6, S02°42'04.5" W06°55'23.4", 11–14.viii.2008, Malaise trap suspended 3 m above the ground, A.M.O. Pes et al. ( MZSP) . Paratypes: 2 males, as holotype ( INPA) . 1 male, Manaus, AM 010 Km 26, 43 m a.s.l., Adolfo Ducke Forest Reserve, #66, Afluente Igarapé Acará (Ig. 23), S02°57'07.4" W59°57'27.6", 04– 07.xi.2008, Malaise trap suspended 3 m above the ground, U.G. Neiss et al. ( ZMBN) . 1 male, Rio Preto da Eva , Ramal baixo do Rio, ponte Km 10, 14.iv.2008, at light, N. Hamada et al. ( ZSM) .

Diagnostic characters. The species belongs in the parcus group. The male can be separated from all other members of the genus by the ventral, narrowly triangular projection of the inferior volsella projecting caudad.

Etymology. Named after MSc. Guilherme Abbad Silveira for all help and encouragement.

Description

Male (n = 4–5, except when otherwise stated). Total length 2.00–2.30, 2.16 mm. Wing length 0.98–1.07, 1.03 mm. Total length / wing length 1.98–2.20, 2.11. Wing length / length of profemur 1.94–2.12, 2.04.

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

Head. AR 1.04–1.17 (3), ultimate flagellomere 449–487 (3) µm long. Inner verticals 0–1, 0; outer verticals 4– 6, 5; postorbitals 2–5, 4. Clypeus with 11–15, 13 setae. Tentorium 63–94, 78 µm long; 20–23, 22 µm wide. Stipes 111 (1) long. Palpomere lengths (in µm): 28–40, 33; 23–28, 25; 73–99, 83; 71–104, 96; 119–149, 139. Third palpomere with 2 sensillae subapically, longest 13–18, 15 µm long.

Thorax. Scutal tubercle absent. Antepronotum without setae. Dorsocentrals 5–6, 5; acrostichals absent; prealars 2. Scutellum with 4 setae.

Wing ( Fig. 13 ). VR 1.34–1.47, 1.39. R with 2–6, 5 setae; R 4+5 with 1–2, 2 setae at apex. Brachiolum with 2 setae. Remaining veins bare.

Legs. Spur of fore tibia (including scale) 37–48, 43 µm long; spur of mid tibia (including comb) 54–75, 70 µm long; spur of hind tibia (including comb) 64–80, 70 µm long. Width at apex of fore tibia 37–48, 43 µm; of mid tibia 37–43, 40 µm; of hind tibia 37–48, 43 µm. Lengths and proportions of legs in Table 2.

Hypopygium ( Figs 14–15 ). Anal point bluntly triangular, 4–8, 6 µm long, not reaching posterior margin of tergite IX. Tergite IX without setae, tergal bands absent. Laterosternite IX with 2 setae. Phallapodeme 40–48, 46 µm long. Transverse sternapodeme 28–33, 30 µm long. Gonocoxite 91–114, 104 µm long. Superior volsella digitiform, 30–43, 38 µm long, with 7–8, 7 dorsal and 4 ventral setae, with microtrichia on ventral surface. Median volsella 2–4, 3 µm long, with 2–3, 3 apical setae, longest 18–25, 23 µm long. Inferior volsella clavate, 40–51, 46 µm long, with 2 apical setae and 4–5, 4 stout and 2 thin setae subapically; projection narrowly triangular, arising from base of volsella, 8–15, 11 µm long, covered with microtrichia. Gonostylus 111–127, 119 µm long. HR 0.72– 1.00, 0.88. HV 1.74–2.18, 2.00.

Female and immatures. Unknown.

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

Figures

FIGURES 13–15. Beardius abbadi sp. n., male. 13—wing; 14—anal point and tergite IX and dorsal aspect of left gonocoxite and gonostylus; 15—hypopygium with anal point and tergite IX removed, left dorsal aspect, right ventral aspect.