Beardius yperoig, 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 : 76-77

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Beardius yperoig

sp. n.

Beardius yperoig sp. n.

( Figs 152–154 View FIGURES 152–154 )

Type material. Holotype: male, BRAZIL, São Paulo State: Ubatuba, Serra do Mar State Park , S23°21'43'' W44°49'22'', 21.i.2002, Malaise trap I-trilha, N.W. Periotto et al. ( MZSP). GoogleMaps

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; superior volsella digitiform; and inferior volsella lacking projection.

Etymology. The name refers to the “Yperoig Village”, the ancient name of Ubatuba, where the type was collected. The name is to be regarded as a noun in apposition.


Male (n = 1). Total length 2.26 mm. Wing length 1.01 mm. Total length / wing length 2.24. Wing length / length of profemur 1.83.

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

Head. AR 1.05, ultimate flagellomere 364 µm long. Temporals 8, not well separated in inner and outer verticals and postorbitals. Clypeus with 10 setae. Tentorium 101 µm long, 23 µm wide. First and second palpomeres 33 and 30 µm long, remaining palpomeres lost.

Thorax. Scutal tubercle absent. Dorsocentrals 7, acrostichals 6, prealars 2. Scutellum with 4 setae.

Wing ( Fig. 152 View FIGURES 152–154 ). VR 1.33. R with 9 setae, R 1 with 1 seta, R 4+5 with 1 seta at apex. Brachiolum with 2 setae. Remaining veins bare.

Legs. Spur of fore tibia (including scale) 40 µm long, spur of mid tibia (including comb) 58 µm long, spur of hind tibia (including comb) 61 µm long. Width at apex of fore tibia 40 µm, of mid tibia 35 µm, of hind tibia 43 µm. Lengths and proportions of legs as in Table 25.

Hypopygium ( Figs 153–154 View FIGURES 152–154 ). Anal point broadly triangular, 2 µm long, not reaching posterior margin of tergite IX. Tergite IX without setae, tergal bands absent. Laterosternite IX with 1 seta. Phallapodeme 51 µm long. Transverse sternapodeme 25 µm long. Gonocoxite 101 µm long. Superior volsella digitiform, slightly curved, 38 µm long, with 5 dorsal, 2 apical, and 2 ventral setae, with microtrichia in basal 2/3 on both dorsal and ventral surfaces. Median volsella 3 µm long, with 3 apical setae, longest 18 µm. Inferior volsella clavate, curved, 53 µm long, with 2 apical thin and 5 subapical stout, bifid setae; projection absent. Gonostylus 99 µm long. HR 1.03. HV 2.28.

Female and immatures. Unknown.

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


Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo