Beardius kumadueni, 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 : 44

Beardius kumadueni sp. n.

( Figs 77–79 )

Type material. Holotype male, BRAZIL, Pará State: Igarapé Kumadueni , 19.iv.1962, light trap, A377, E.J. Fittkau ( ZSM).

Diagnostic characters. The species belongs in the parcus group. The male can be separated from all other members of the genus by the presence of an unique dorsomedial extension of the gonocoxite.

Etymology. The name refers to the type locality, Igarapé Kumadueni. The name is to be regarded as a noun in apposition.

Description

Male (n = 1). Total length 2.58 mm. Wing length 1.35 mm. Total length / wing length 1.91. Wing length / length of profemur 1.92.

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

Head. AR 1.02, ultimate flagellomere 505 µm long. Inner verticals 2, outer verticals 3, postorbitals 3. Clypeus with 8 setae. Tentorium 93 µm long, 20 µm wide. Stipes 106 µm long. Palpomere lengths (in µm): 28, 30, 81, 112, 171. Third palpomere with 4 sensillae subapically, longest 10 µm long.

Thorax. Scutal tubercle absent. Dorsocentrals 5, acrostichals absent, prealars 2. Scutellum with 4 setae.

Wing ( Fig. 77 ). VR 1.48. R with 3 setae, R 4+5 with 9 setae. Brachiolum with 2 setae. Remaining veins bare.

Legs. Spur of fore tibia (including scale) 48 µm long, spur of mid tibia (including comb) 68 µm long, spur of hind tibia (including comb) 68 µm long. Width at apex of fore tibia 40 µm, of mid tibia 40 µm, of hind tibia 44 µm. Lengths and proportions of legs as in Table 13.

Hypopygium ( Figs 78–79 ). Anal point absent. Tergite IX without setae, tergal bands present. Laterosternite IX with 1 seta. Phallapodeme 61 µm long. Transverse sternapodeme 41 µm long. Gonocoxite 118 µm long, with bluntly triangular dorsomedial extension. Superior volsella digitiform, 55 µm long, with 8 dorsal and 3 ventral setae, densely covered with microtrichia. Median volsella 3 µm long, with 2–3 apical setae, longest 22 µm long. Inferior volsella clavate, curved, 61 µm long, with 2 apical thin and 7 subapical stout setae; projection absent. Gonostylus 89 µm long. HR 1.32. HV 2.89.

Female and immatures. Unknown.

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

Figures

FIGURES 77–79. Beardius kumadueni sp. n., male. 77—wing; 78—tergite IX and dorsal aspect of left gonocoxite and gonostylus; 79—hypopygium with tergite IX removed, left dorsal aspect, right ventral aspect.