Nilothauma yekwana sp. nov. Figures 15A, B, 16A

Type material.

Holotype male, slide-mounted: Brazil, Roraima, Boa Vista, BR-174, Igarapé Água Boa, 02°43'32"N, 60°48'43"W, 2014, N. Hamada leg (UFSC).

Etymology.

The specific epithet honours the Ye’kwana, indigenous people from the Roraima State, Brazil. The name is to be regarded as a noun in apposition.

Diagnostic characters.

The male can be distinguished from its congeners by the combination of: tergite IX with two setose dorsolateral lobes; anal point absent; posterior margin of tergite IX subrectangular; inferior volsella straight, tapering to apex; superior volsella curved, projecting posteriolaterally; median volsella broad, triangular, bearing 7 strong setae.

Description.

Male imago (n = 1). Total length 1.77 mm. Wing length 0.91 mm. Total length/wing length 1.95. Wing length/length of profemur 2.19.

Colouration. Head, thorax, legs and abdomen uniformly light brown. Wing membrane without dark markings.

Antenna. AR = 0.22. Thirteenth flagellomere 137 µm long.

Head. Temporal setae 7 in single row. Clypeus with 15 setae. Tentorium 65 µm long, maximum width 12 µm . Stipes 80 µm long. Palp segment I-III lengths (in µm): 22, 17, 50; segment IV and V lost. Third palpomere with 2 sensilla clavata subapically, longest 15 µm .

Thorax. Dorsocentrals 5 in single row, acrostichals 10, prealars 2. Scutellum with 2 setae.

Wing. VR = 1.48. Brachiolum with 1 seta, R with 6 setae, R4+5 with 2 setae at apex, remaining veins bare.

Legs. Spur of fore tibia 44 µm long including 15 µm long scale. Mid-tibia with 1 spur, 20 µm long; hind tibia with 2 spurs, 20 and 25 µm long. Combs of mid-tibia 15 µm long, of hind tibia 18 µm long. Width at apex of fore tibia 39 µm, of mid-tibia 39 µm, of hind tibia 44 µm . Lengths and proportions of legs as in Table 13.

Hypopygium (Fig. 15A, B). Tergite IX with 2 dorsolateral, densely setose lobes, setae about 15 µm long; with 2 strong setae anterolaterally, 2 medially and 4 close to posterior margin; posterior margin subquadrangular, anal point absent. Tergite bands lacking. Laterosternite IX with 1 seta. Phallapodeme 37 µm long; transverse sternapodeme 10 µm long. Gonocoxite 65 µm long. Inferior volsella straight, tapering to apex, 40 µm long, 7 µm wide medially, with microtrichia and 9 simple setae subapically. Superior volsella curved, projecting posteriolaterally, 22 µm long, 5 µm wide at base, covered with microtrichia and fringed at apex. Median volsella broad, triangular, 15 µm long, with 7 strong setae (one of them bifid), longest 20 µm . Gonostylus 75 µm long, straight. HR = 0.87. HV = 2.36.

Female adult and immatures.

Unknown.

Distribution

(Fig. 16A). Known from Roraima State, Brazilian Amazon.