Beardius bizzoi, 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 : 24-25

Beardius bizzoi sp. n.

( Figs 26–29 )

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–05.xii.2004, Malaise trap, L.C. Pinho & L.E.M. Bizzo ( MZSP) . Paratypes: 8 males, as holotype ( MZSP, MZUFBA, INPA, ZSM, ZMBN) .

Diagnostic characters. The species belongs in the tupinamba group. The male can be separated from other species of the tupinamba group by the combination of the following characters: large body size (3.8–4.9 mm); coloration brown; R 1 with setae; and superior volsella without microtrichia.

Etymology. Named after Dr. Luís Eduardo Maestrelli Bizzo for collecting some of the material.

Description

Male (n = 8–9, except when otherwise stated). Total length 3.81–4.90, 4.43 mm. Wing length 2.26–2.68, 2.51 mm. Total length / wing length 1.68–1.88, 1.77. Wing length / length of profemur 2.24–2.54, 2.40.

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

Head. AR 1.04–1.28, 1.16; ultimate flagellomere 594–749, 696 µm long. Temporal setae 10–13, 11; not well separated in inner and outer verticals and postorbitals. Clypeus with 15–18, 16 setae. Tentorium 134–195, 152 µm long; 30–51, 40 µm wide. Stipes 159–202, 182 (6) µm long. Palpomere lengths (in µm): 35–48, 43; 43–51, 48; 172–202, 190; 175–202, 190; 240–311, 276. Third palpomere with 5–6, 5 sensillae subapically, longest 20–28, 23 µm long.

Thorax. Scutal tubercle absent. Antepronotum without setae. Dorsocentrals 7–10, 9; acrostichals absent; prealars 2. Scutellum with 4–6, 5 setae.

Wing ( Fig. 26 ). VR 1.24–1.35, 1.32. R with 16–23, 20 setae; R 1 with 10–17, 14 setae; R 4+5 with 20–33, 27 setae. Brachiolum with 2–3, 2 setae. Remaining veins bare.

Legs. Spur of fore tibia (including scale) 94–131, 112 µm long; spur of mid tibia (including comb) 131–178, 159 µm long; spur of hind tibia (including comb) 140–178, 159 µm long. Width at apex of fore tibia 103–140, 122 µm; of mid tibia 122–178, 140 µm; of hind tibia 140–168, 159 µm. Lengths and proportions of legs as in Table 4.

Hypopygium ( Figs 27–28 ). Anal point absent to weakly projected, at most 4 µm long. Tergite IX without setae, tergal bands weak to absent. Laterosternite IX with 2–4, 3 setae. Phallapodeme 81–109, 94 µm long. Transverse sternapodeme 51–86, 63 µm long. Gonocoxite 157–187, 175 µm long. Superior volsella digitiform, weakly curved, 71–81, 76 µm long, with 7–9, 8 dorsal and 4–5, 4 ventral setae, without microtrichia. Median volsella 3–5, 4 µm long, with 3–5, 4 apical setae, longest 28–33, 30 µm long. Inferior volsella clavate, 76–106, 94 µm long, with 2–3, 2 apical thin setae and 8–10, 9 stout, bifid or trifid setae subapically; projection narrowly triangular in dorsal view, arising from basal 2/3 of volsella, bearing fringe of long lamellae ( Fig. 29 ). Gonostylus 192–218, 207 µm long. HR 0.73–0.93, 0.85. HV 2.06–2.47, 2.31.

Female and immatures. Unknown.

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

Figures

FIGURES 26–29. Beardius bizzoi sp. n., male. 26—wing; 27—tergite IX and dorsal aspect of left gonocoxite and gonostylus; 28—hypopygium with tergite IX removed, left dorsal aspect, right ventral aspect; 29—inferior volsella, lateral view.