Beardius vanessae, 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 : 73-75

Beardius vanessae sp. n.

( Figs 144–149 )

Type material. Holotype male, BRAZIL, São Paulo State: Guaíra, Fazenda Boa Esperança , S20°23'59'' W48°22'03'', 25.xii.2005, at light, V.S. Kataguiri ( MZSP) . Paratypes: 2 males, as holotype ( MZSP, ZMBN) .

Diagnostic characters. The species belongs in the truncatus group. The male can be separated from all other members of the genus by the unique, rounded projection of the inferior volsella, arising from the very base of the volsella and fused to the ventral surface of the superior volsella.

Etymology. Named after MSc. Vanessa Suzuki Kataguiri, who collected the specimens.

Description

Male (n = 1–3). Total length 2.71–2.94 mm. Wing length 1.30–1.36 mm. Total length / wing length 2.03–2.18. Wing length / length of profemur 1.85–1.87.

Coloration. Head and thorax pale; abdomen pale, with narrow anterior brown bands on tergites II–VIII. Legs pale.

Head ( Fig. 144 ). AR 1.20–1.45, ultimate flagellomere 137–147 µm long. Inner verticals 2–3, outer verticals 5, postorbitals 3–4. Clypeus with 10–12 setae. Cibarial pump, tentorium and stipes as in Figure 145 . Tentorium 96– 132 µm long, 25–30 (2) µm wide. Stipes 121–127 µm long. Palpomere lengths (in µm): 30–33; 34–37; 104–106; 124–134; 183–186. Third palpomere with 2–3 sensillae subapically, longest 13–15 µm long.

Thorax ( Fig. 146 ). Scutal tubercle present. Dorsocentrals 6–7, acrostichals absent, prealars 2. Scutellum with 4 setae.

Wing ( Fig. 147 ). VR 1.20–1.27. R with 0–5 setae, R 4+5 with 2–3 setae at apex. Brachiolum with 2 setae. Remaining veins bare.

Legs. Spur of fore tibia (including scale) 43–48 µm long, spur of mid tibia (including comb) 73–77 µm long, spur of hind tibia (including comb) 64–80 µm long. Width at apex of fore tibia 41–45 µm, of mid tibia 52–56 µm, of hind tibia 54–64 µm. Lengths and proportions of legs as in Table 24.

Hypopygium ( Figs 148–149 ). Anal point absent. Tergite IX without setae, tergal bands absent. Laterosternite IX with 2 setae. Phallapodeme 58–63 µm long. Transverse sternapodeme 46–48 µm long. Gonocoxite 101–114 µm long. Superior volsella digitiform, 58–61 µm long, with 8–9 dorsal and 4 ventral setae. Median volsella 3–4 µm long, with 2–3 apical setae, longest 23–25 µm long. Inferior volsella clavate, curved, with apical 1/3 parallel-sided, straight, 78–89 µm long, with 2 apical thin and 6–9 subapical thin setae; projection rounded, fused to ventral surface of superior volsella, with microtrichia. Gonostylus 132–139 µm long. HR 0.73–0.83. HV 2.11–2.33.

Female and immatures. Unknown.

Distribution. The species is collected in the São Paulo State in Brazil.

Figures

FIGURES 144–149. Beardius vanessae sp. n., male. 144—head; 145—tentorium, stipes and cibarial pump; 146—thorax; 147—wing; 148—tergite IX and dorsal aspect of left gonocoxite and gonostylus; 149—hypopygium with tergite IX removed, left dorsal aspect, right ventral aspect.