Beardius krenak, 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 : 42-44

Beardius krenak sp. n.

( Figs 71–76 )

Type material. Holotype: male, BRAZIL, Minas Gerais State: Serra do Cipó National Park, Km 130, 23.vii.1972, at temporary pool, hand net, C.G. Froehlich ( MZSP) . Paratypes: 9 males, as holotype ( MZSP, ZMBN, INPA, MZUFBA) .

Diagnostic characters. The species belongs in the truncatus group. The male can be separated from all other members of the genus by the unique basal projection of the inferior volsella bearing very long setae.

Etymology. The name refers to the Krenak Indians, an ethnic group from the Minas Gerais State, Brazil. The name is to be regarded as a noun in apposition.

Description

Male (n = 9–11, except when otherwise stated). Total length 3.03–3.63, 3.39 mm. Wing length 1.74–1.94, 1.83 mm. Total length / wing length 1.57–1.97, 1.85. Wing length / length of profemur 1.93–2.19, 2.02.

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

Head ( Fig. 71 ). AR 1.21–1.46, 1.34; ultimate flagellomere 608–673, 645 µm long. Inner verticals 1–2, 2 (6); outer verticals 3–5, 4 (6); postorbitals 3–5, 4 (6). Clypeus with 8–11, 10 (8) setae. Tentorium, stipes and cibarial pump as in Figure 72 . Tentorium 119–132, 124 µm long; 23–33, 28 µm wide. Stipes 127–159, 147 (6) µm long. Palpomere lengths (in µm): 33–38, 35 (8); 38–51, 46 (8); 94–139, 124 (8); 111–159, 134 (7); 142–223, 180 (5). Third palpomere with 2–3, 3 (8) sensillae subapically, longest 18–25, 23 (8) µm long.

Thorax ( Fig. 73 ). Scutal tubercle absent. Dorsocentrals 5–8, 7; acrostichals absent; prealars 2. Scutellum with 2–4, 3 setae.

Wing ( Fig. 74 ). VR 1.17–1.37, 1.25. R with 4–8, 7 setae; R 1 with 0–1, 0 seta; R 4+5 with 2–7, 4 setae. Brachiolum with 1–2, 2 setae. Remaining veins bare.

Legs. Spur of fore tibia (including scale) 48–64, 59 µm long; spur of mid tibia (including comb) 70–80, 75 µm long; spur of hind tibia (including comb) 75–96, 86 µm long. Width at apex of fore tibia 54–75, 64 µm; of mid tibia 54–64, 59 µm; of hind tibia 59–75, 64 µm. Lengths and proportions of legs as in Table 12.

Hypopygium ( Figs 75–76 ). Anal point absent. Tergite IX without setae, tergal bands present. Laterosternite IX without setae. Phallapodeme 63–89, 76 µm long. Transverse sternapodeme 25–51, 38 µm long. Gonocoxite 139– 157, 149 µm long. Superior volsella digitiform, curved, 51–63, 56 µm long, with 7–9, 8 dorsal, 2 apical, and 4–6, 5 ventral setae, without microtrichia. Median volsella absent. Inferior volsella clavate, curved, 46–63, 56 µm long, with 2 apical thin and 6–8, 7 subapical stout setae, with microtrichia dorsally in basal 1/2; projection arising from base of volsella, subtriangular with rounded apex, 20–30, 25 µm long, with numerous, strong setae, longest 71– 101, 86 µm long. Gonostylus 101–137, 119 µm long. HR 1.11–1.51, 1.29. HV 2.83–3.42, 3.14.

Female and immatures. Unknown.

Distribution. The species is collected in the Minas Gerais State in Brazil.

Figures

FIGURES 71–76. Beardius krenak sp. n., male. 71—head; 72—tentorium, stipes and cibarial pump; 73—thorax; 74—wing; 75—tergite IX and dorsal aspect of left gonocoxite and gonostylus; 76—hypopygium with tergite IX removed, left dorsal aspect, right ventral aspect.