Nilothauma marianoi sp. nov. Figures 8A, B, 16B

Type material.

Holotype male, slide-mounted: Brazil, Bahia, Barreiras, Rio de Janeiro, cachoeira Acaba Vidas, 11°53'40"S, 45°36'57"W, 722 m a.s.l., 14.x.2008, light trap, A.R. Calor, R. Mariano & S. Mateus leg. (UFSC).

Etymology.

The specific epithet is a noun in the genitive case honouring Rodolfo Mariano, for his friendship and prolific fieldwork.

Diagnostic characters.

The male can be distinguished from its congeners by the combination of: wing without dark markings; tergite IX without setose dorsal lobe(s) or thorns, with single, strong median seta, with narrowly triangular posterior margin and small, apical, parallel-sided anal point.

Description.

Male imago (n = 1). Total length 3.51 mm. Wing length 1.45 mm. Total length/wing length 2.43. Wing length/length of profemur 2.27.

Colouration. Thorax and legs brown, abdomen light brown. Wing membrane without dark markings.

Antenna. AR = 0.19. Thirteenth flagellomere 152 µm long.

Head. Temporal setae 6 in partly double row. Clypeus with 9 setae. Tentorium 98 µm long, maximum width 18 µm . Stipes not measurable. Palp segment lengths (in µm): 17, 18, 44, 99, 117. Sensilla clavata on third palpomere not discernable. Fifth palpomere/third palpomere 2.66.

Thorax. Dorsocentrals 6 in single row, acrostichals 4, prealars 2. Scutellum with 2 setae.

Wing. VR = 1.39. Brachiolum with 1 seta, R with 8 setae, R4+5 with 1 apical seta, remaining veins bare.

Legs. Spur of fore tibia 68 µm long including 28 µm long scale. Mid-tibia with 1 spur, 47 µm long; hind tibia with 2 spurs, 43 and 61 µm long. Combs of mid-tibia 21 µm long, of hind tibia 26 µm long. Width at apex of fore tibia 47 µm, of mid-tibia 48 µm, of hind tibia 52 µm . Lengths and proportions of legs as in Table 7.

Hypopygium (Fig. 8A, B). Tergite IX without dorsal lobes, with single, median, strong setae, posterior margin narrowly subtriangular with 7 setae to each side. Anal point situated apically, small, parallel-sided with rounded apex, 14 µm long, 4 µm wide basally, 3 µm wide medially. Tergite bands lacking. Laterosternite IX with 2 setae. Phallapodeme 51 µm long; transverse sternapodeme 11 µm long. Gonocoxite 104 µm long. Inferior volsella weakly curved, 103 µm long, 11 µm wide subapically, with microtrichia and 18 setae in apical one-half. Superior volsella subquadrangular, 48 µm long, 17 µm wide medially, covered with microtrichia. Median volsella consisting of 14 µm long tubercle, covered with microtrichia and with 1 strong apical seta, setae about 19 µm long. Gonostylus nearly straight, 104 µm long, 10 µm wide medially, 17 µm wide subapically. HR = 0.72. HV = 2.44.

Female adult and immatures.

Unknown.

Distribution

(Fig. 16B). Only known from Bahia State in Brazil.