Beardius dioi, 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 : 35-39

Beardius dioi sp. n.

( Figs 54–66 )

Type material. Holotype male, BRAZIL, Amazonas State : Rio Branquinho, Acampamento Tapiri, 22.vii.1961, light trap, A213–1, E.J. Fittkau ( ZSM) . Paratype: 1 male with associated pupa, “Zucht, A176–1, Benthos from Zone I (part of Zone II, quiet spots); from leaves, moderate flow-through, with coarse detritus, 29.v.1961, E.J. Fittkau ” ( MZSP) . 1 male, 1 female, 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. ( INPA) . 1 male, 1 female, Manaus , AM 010 Km 26, 55 m a.s.l., Adolfo Ducke Forest Reserve , #64, Igarapé Bolívia (Ig. 23), S02°59'14.8" W59°56'47.1", 09–12.xi.2008, Malaise trap suspended 3 m above the ground, U.G. Neiss et al. ( MZSP) . 1 male, Novo Aripuanã , Soka Gakkai Reserve, 07–09.vii.2008, Pennsylvania trap, N. Hamada et al. ( MZUFBA) .

Diagnostic characters. The species belongs in the parcus group. The male can be separated from all other members of the genus by the combination of the following characters: acrostichals present; tergal bands present; and inferior volsella with conspicuous, lingulate basal projection. The female by: acrostichals present; and clypeus with about 50 setae. The pupa by: tergite VI with shagreen in anterior 2/3 and in two posterolateral patches; anal spur of tergite VIII with a dominant tooth and minute accessory teeth; and paratergite VIII with very short spines.

Etymology. Named after the late Ronnie James Dio, according to the senior author the greatest rock singer of all times.

Description

Male (n = 1–2). Total length 3.60–3.99 mm. Wing length 1.47–1.74 mm. Total length / wing length 2.07–2.70. Wing length / length of profemur 1.48.

Coloration. Head pale to stramineous. Thorax pale with vittae, antepronotum and postnotum brown. Abdomen pale, tergites I–VIII each with transverse, anterior brown band and lighter brown lateral bands. Legs pale.

Head. AR 1.37–1.63, ultimate flagellomere 755–903 µm long. Temporal setae 9–12, not well separated in inner and outer verticals and postorbitals. Clypeus with 47 setae. Tentorium 132–161 µm long, 34–36 µm wide. Stipes not measurable. Palpomere lengths (in µm): 25, 29–32, 79–86, 120–129, 193–209. Third palpomere with 5 sensillae subapically, longest 23 µm long.

Thorax ( Fig. 55 ). Scutal tubercle absent. Dorsocentrals 7, 1 of them near antepronotum; acrostichals 4; prealars 2–3. Scutellum with 4 setae.

Wing ( Fig. 54 ). VR 1.43. R with 10–12 setae, R 1 with 10–13 setae, R 4+5 with 14–17 setae at apex. Brachiolum with 2 setae. Remaining veins bare.

Legs. Spur of fore tibia (including scale) 73 µm long, spur of mid tibia (including comb) 93 µm long, spur of hind tibia (including comb) 98 µm long. Width at apex of fore tibia 50 µm, of mid tibia 52 µm, of hind tibia 59 µm. Lengths and proportions of legs as in Table 9.

Hypopygium ( Figs 56–58 ). Anal point bluntly triangular, 14–18 µm long. Tergite IX without setae, tergal bands present. Laterosternite IX with 1 seta. Phallapodeme 73–82 µm long. Transverse sternapodeme 54 µm long. Gonocoxite 145–163 µm long. Superior volsella digitiform, curved, 73–79 µm long, with 7–8 dorsal, 2 apical, and 2 ventral setae, with dorsal microtrichia in basal 2/3. Median volsella 4 µm long, with 2–3 apical setae, longest 30 µm long. Inferior volsella clavate, curved, 100–102 µm long, with 2 apical thin setae and 5 subapical stout, bifid setae; projection arising from basal 1/2 of volsella lingulate, broad, 95–107 µm long, densely covered with microtrichia. Gonostylus 152–168 µm long. HR 0.95–0.97. HV 2.37–2.38.

Female (n = 1–2). Total length 3.13–3.64 mm. Wing length 1.70–1.77 mm. Total length / wing length 1.77– 2.14. Wing length / length of profemur 1.52–1.69.

Coloration. Head pale to stramineous. Thorax pale with vittae, antepronotum and postnotum brown. Abdomen pale, tergites I–VIII each with transverse, anterior brown band and lighter brown lateral bands. Legs pale.

Head. AR 0.34, ultimate flagellomere 152 µm long. Inner vertical 1, outer verticals 5, postorbitals 4. Clypeus with 51–54 setae. Tentorium 139 µm long, 23 µm wide. Stipes 139 µm long. Palpomere lengths (in µm): 30–33, 35–38, 94–104, 139–147, 230–240. Third palpomere with 3 sensillae subapically, longest 18–28 µm long.

Thorax ( Fig. 60 ). Scutal tubercle absent. Dorsocentrals 7–9, 1–3 of them close to antepronotum; acrostichals 8; prealars 2. Scutellum with 4 setae.

Wing ( Fig. 59 ). VR 1.26. R with 5 setae, R 1 with 1 seta, R 4+5 with 2 setae at apex. Brachiolum with 2 setae. Remaining veins bare.

Legs. Spur of fore tibia (including scale) 31–33 µm long, spur of mid tibia (including comb) 48–63 µm long, spur of hind tibia (including comb) 53–56 µm long. Width at apex of fore tibia 26–30 µm, of mid tibia 29–31 µm, of hind tibia 30–33 µm. Lengths and proportions of legs as in Table 10.

Genitalia ( Figs 61–62 ). Tergite IX with 19–28 setae. Cercus 81 µm long, 35 µm wide. Notum 89–101 µm long. Gonocoxite IX with 1 seta. Seminal capsule 46–56 µm long, neck absent.

Pupa (n = 1). Total length 3.83 mm.

Coloration. Cephalothorax and abdomen pale.

Cephalothorax ( Fig. 64 ). Frontal apotome conical ( Fig. 63 ), frontal setae 41 µm long. Thorax without dorsal granulation. Thoracic horn with 6 branches; anterior branch stout, with spinules in apical 2/3. Distance between Dc1 and Dc2 22 µm, between Dc2 and Dc3 144 µm, between Dc3 and Dc4 12 µm. Precorneal 1, antepronotals and prealars absent.

Abdomen ( Fig. 66 ). Tergites I, VII and VIII without shagreen. Tergites II–V with transverse anterior band of shagreen a little stronger than contiguous posterior shagreen. Tergite VI with uniformly thin shagreen. Row of hooklets on tergite II about 2/3 of tergite width. Conjuntive IV/V with spinules in two patches. Paratergite V with few posterior spinules. Pedes spurii A and pedes spurii B present. Segment I without L setae; segments II–IV with 3 L setae; segment V with 3 taeniate L setae; segments VI–VII with 4 taeniate L; segment VIII with 3–4 taeniate L setae. Segment VIII with short, thin lateral spines, anal spur simple, with short accessory spines ( Fig. 65 ). Anal lobe 163 µm long, with 12 taeniate setae.

Larva. Unknown.

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

Figures

FIGURES 54–58. Beardius dioi sp. n., male. 54—wing; 55—thorax; 56—hypopygium, lateral view; 57—anal point and tergite IX and dorsal aspect of left gonocoxite and gonostylus; 58—hypopygium with anal point and tergite IX removed, left dorsal aspect, right ventral aspect.

FIGURES 59–62. Beardius dioi sp. n., female. 59—wing; 60—thorax; 61—genitalia, ventral view; 62—tergite IX.

FIGURES 63–66. Beardius dioi sp. n., pupa. 63—frontal apotome; 64—thorax; 65—paratergite VIII; 66—abdominal segments I–VIII and anal lobe, dorsal view.