Nilothauma calori, Mendes, Humberto Fonseca & Andersen, Trond, 2009

Mendes, Humberto Fonseca & Andersen, Trond, 2009, Neotropical Nilothauma Kieffer, 1921, with the description of thirteen new species (Diptera: Chironomidae), Zootaxa 2063, pp. 1-45 : 18-19

Nilothauma calori sp. n.

( Figs 17–19 )

Type material. Holotype male, BRAZIL: Acre : Mâncio Lima, Parque Nacional do Divisor, igarapé Amor, 18.ii.2006, light trap, A. R. Calor ( MZUSP). Paratype: 1 male, Acre : Mâncio Lima, Pé da Serra, Rio Moa, in front of IBAMA office, 17.ii.2006, light trap, A. R. Calor ( ZMBN).

Diagnostic characters. The two dorsal, setose lobes on tergite IX and the presence of a lateral thorn on laterosternite IX combined with lack of anal point, inferior volsella with stout, simple setae, and superior volsella with lateral, strongly sclerotized, spine-like projection will separate the male of N. calori from all other Nilothauma species.

Etymology. Named after Dr. Adolfo R. Calor, who collected the specimens.

fe ti ta1 ta2 ta3 ta4 p1 500–724 324–475 576 259 194 137 p2 508–641 328–407 184–266 72–115 47–54 25–47 p3 569–749 497–684 252 122 122 72

ta5 LR BV SV BR p1 61 1.78 2.15 1.43 3.1 p 2 22–27 0.56–0.65 4.87–5.89 3.92–4.55 3.5 p3 43 0.51 3.66 4.23 4.5 Male (n = 1–2). Total length 2.83–3.08 mm. Wing length 1.11–1.48 mm. Total length / wing length 2.08–2.54. Wing length / length of profemur 2.09–2.24.

Coloration. Thorax pale brown with darker scutum and postnotum; foretibia darker basally and apically, other segments and legs uniformly pale brown.

Head. AR 0.18–0.44. Thirteenth flagellomere 151–216 µm long; stout subapical seta 40–54 µm long. Temporal setae 4 in single row including 1 inner vertical and 3 postorbitals. Frontal tubercles present. Clypeus with about 12 setae. Tentorium 75 µm long, 11 µm wide. Stipes 93 µm long. Palp segment lengths (in µm): 23, 23–25, 54–61, 86–91, 100–109. Third palpomere with 2 sensilla clavata subapically, longest 16–20 µm long. Fifth palpomere / third palpomere 1.79–1.85.

Thorax. Dorsocentrals 4–6 in single row, acrostichals 2–3, prealars 2–3. Scutellum with 2 setae.

Wing. VR 1.45–1.48. Brachiolum with 1 seta, R with 5–11 setae, R4+5 with 2 setae apically, remaining veins bare.

Legs. Spur of foretibia 57–64 µm long including 27 µm long scale. Midtibia with 1 spur, 30–32 µm long; hind tibia with 2 spurs, 27 µm and 32–43 µm long. Combs of midtibia 14–19 µm long, of hind tibia 16–20 µm long. Width at apex of foretibia 32–40 µm, of midtibia 36–41 µm, of hind tibia 29–41 µm. Lengths and proportions of legs as in Table 3.

Abdomen. Tergites with few setae. Segment VIII long, weakly triangularly, tapering anteriorly.

Hypopygium ( Figs 17–18 ). Tergite IX with broadly rounded posterior margin; with 4–6 setae along posterior margin; with pair of dorsal, wart-like lobes submedially, each with 7–9 long setae. Anal point lacking. Laterosternite IX with 1 setae and lateral thorn. Phalapodeme 41–45 µm long; transverse sternapodeme lacking. Gonocoxite 98–100 µm long. Inferior volsella curved with rounded apex, 54–64 µm long, 9 µm wide subapically, with microtrichia and 6–9 short, stout setae subapically. Superior volsella ( Fig. 19 ) 41–57 µm long, 7 µm wide at base, 6 µm wide at apex, with microtrichia in apical 1/2, marginal microtrichia strong; with lateral strongly sclerotized, spine-like projection, 14 µm long, 3 µm wide at base. Median volsella ( Fig. 19 ) parallel-sided, 8–14 µm long, 4 µm wide, with microtrichia and 2 strong apical setae. Gonostylus parallel-sided, weakly curved, 113–118 µm long, all setae hair-like. HR 0.83–0.88, HV 2.49–2.61.

Female and immatures. Unknown.

Distribution. Known only from Acre , Brazil.

Figures

FIGURES 17 – 19. Nilothauma calori sp. n., male. 17 — dorsal aspect of hypopygium. 18 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 19 — median and superior volsella, dorsal view.