Uirassubrillia, Mendes, Humberto Fonseca, Andersen, Trond & Pinho, Luiz Carlos, 2013

Mendes, Humberto Fonseca, Andersen, Trond & Pinho, Luiz Carlos, 2013, Uirassubrillia beckeri gen. n., sp. n. (Diptera: Chironomidae, Orthocladiinae) from northeastern Brazil, Zootaxa 3716 (1), pp. 65-74 : 66-67

Uirassubrillia gen. n.

Type species. Uirassubrillia beckeri sp. n.

Etymology. From ‘ Uirassu ’, the name of the nature reserve where the species was collected, using the suffix ‘ brillia ’, indicating that the genus belongs in the Brillia -group. Gender of genus: feminine.

Diagnostic characters. The male imagines can be separated from all other genera in the Brillia -group based on the combination of temporal setae multiserial and restricted to inner and outer verticals; antepronotals divided into dorsal and lateral clusters of setae; wing extensively setose, SC bare, anal lobe weakly developed; LR1> 1.00, hind tibia with comb composed of few, thin setae; tergite IX with two clusters of strong setae, sternapodeme inverted V-shaped with distinct oral projections, transverse sternapodeme short, inferior volsella (distomedial lobe) composed of a cluster of setae on low protuberance, gonostylus bifurcate, lacking true megaseta. The female imagines can be separated from all other genera in the Brillia -group based on the combination of temporal setae multiserial and restricted to inner and outer verticals; pedicel with few ventral setae; wing extensively setose, SC bare, anal lobe weakly developed; LR1> 1.00; fore tibiae without spur; hind tibia with comb composed of few, thin setae; a third thin-walled seminal capsule present; seminal capsules smooth; seminal ducts nearly straight, ending in common opening, with distinct glands; dorsomesal lobe slender, line-like; ventrolateral lobe subquadrangular, covering most of the vagina.

Generic diagnosis. Male. Medium sized, wing length 1.5–1.7 mm.

Head. Antenna with 13 flagellomeres, groove beginning on flagellomere 2; sensilla chaetica on flagellomeres 2–3 and 13; fully plumed with setae reaching apex of ultimate flagellomere. Antennal ratio 1.00–1.20. Eye bare with few microtrichia between ommatids along inner margin; with well developed parallel-sided dorsomedial extension. Temporal setae multiserial, restricted to inner and outer verticals, with inner verticals clumped near coronal suture. Palp long, slender; third palpomere with few scattered sensilla clavata subapically.

Thorax. Antepronotum well developed with dorsal and lateral setae; lobes separated by narrow notch. Acrostichals lacking; dorsocentrals strong, beginning close to antepronotum, anterior irregularly bi- to triserial, posterior biserial; humerals lacking; prealars strong, few, irregularly biserial, not extended anteriorly; supraalars present. Scutellars strong, uniserial with few scattered anterior setae.

Wing. Membrane with extensive setation, with coarse punctuation (visible at 250 times magnification). Anal lobe weak. Costa strongly extended. R2+3 running equally distance from R1 and R4+5, ending closer to R1. R4+5 ending distal to M3+4; RM long, oblique; Cu1 curved to slightly sinuous; FCu distal to RM; all veins except Sc and R2+3 with setae. Squama with few setae.

Legs. Pseudospurs and sensilla chaetica absent. Hind tibial comb with few (6), thin setae. Spurs of mid- and hind leg with strong lateral denticles. Pulvilli present, but weak. Claws with pointed tip.

Abdomen. Tergites II–VIII with antero-median cluster of setae. Sternites I–III bare, sternites IV–VIII with few scattered setae.

Hypopygium. Tergite IX with two clusters of strong setae; anal point absent. Sternapodeme inverted V-shaped with distinct oral projections, transverse sternapodeme short, straight. Virga absent. Gonocoxite parallel-sided and elongated; superior volsella well developed, elongate and narrow; inferior volsella (distomedial lobe) composed of a cluster of setae on low protuberance. Gonostylus bifurcate, subapical lobe bare, shorter than apical lobe; apical lobe without megaseta, but with strong basal and apical setae.

Female. Medium sized, wing length 1.5–1.7 mm.

Head. Antenna with 5 flagellomeres; all flagellomeres with long, simple sensilla chaetica; fifth flagellomere with few, long, apical to subapical setae; pedicel with few, strong, ventral setae. Antennal ratio 0.33–0.36. Eye bare, with well developed parallel-sided dorsomedial extension. Temporal setae multiserial, restricted to inner and outer verticals. Palp long, slender; third palpomere with few scattered sensilla clavata subapically.

Thorax. Antepronotum well developed with dorsal, median and lateral setae; lobes separated by narrow notch. Acrostichals lacking; dorsocentrals strong beginning close to antepronotum, anterior irregularly triserial, posterior biserial; humerals lacking; prealars strong, few, biserial, not extended anteriorly; supraalars present. Scutellars strong, uniserial with few scattered anterior setae.

Wing. Membrane with extensive setation, with coarse punctuation (visible at 250 times magnification). Anal lobe weak. Costa strongly extended. R2+3 running equally distant from R1 and R4+5, ending closer to R4+5. R4+5 ending distal to M3+4; RM long, oblique; Cu1 curved to slightly sinuous; FCu distal to RM; all veins except Sc and R2+3 with setae. Squama with few setae.

Legs. Pseudospurs and sensilla chaetica absent. Spur of fore tibia absent. Hind tibial comb with few (6), thin setae. Pulvilli present, but weak. Claws with pointed tip.

Abdomen. Tergites II–VIII with antero-median cluster of setae. Sternites I–III bare, sternites IV–VIII with few scattered setae.

Genitalia. Gonocoxite well developed, with strong setae. Coxosternapodeme connected with main branch of dorsomesal lobe. Tergite IX divided, with two well delimited areas of setae. Cercus well developed. Gonapophysis VIII divided into a dorsomesal lobe that encircles the anterior part of the vagina, and well developed, subquadrangular ventrolateral lobe that covers most of the posterior part of the vagina. Apodeme lobe rounded, located under the ventrolateral lobe. Three seminal capsules present, the median is smaller and paler than the lateral ones which are rounded, smooth, with distinct neck region. Seminal ducts straight, with distinct glands, ending in common opening. Labia without microtrichia.