Sigmoitendipes fittkaui, Andersen & Mendes & Pinho, 2017

Andersen, Trond, Mendes, Humberto Fonseca & Pinho, Luiz Carlos, 2017, TWO NEW NEOTROPICAL CHIRONOMINAE GENERA (DIPTERA: CHIRONOMIDAE) Abstract, CHIRONOMUS Journal of Chironomidae Research 30 (30), pp. 26-54 : 46

Sigmoitendipes fittkaui new species

http://zoobank.org/ F054E059-AEC3-4B2F-B436- 282BDD1EA14A

Type material: Holotype: BRAZIL, Pará, Rio Cururu, Missão São Francisco (Missão Cururu), 07°33’51”S, 57°44’23”W, 6.ii.1961, at light at the mission building, EJ Fittkau, 1 male ( ZSM - A 88-11 ) . Paratype: BRAZIL, Mato Grosso, Rio Tuatuari near Posto Leonardo , 12°11’55”S, 53°22’51”W, 3.ix.1965, at light, EJ Fittkau, 1 male ( ZSM - A 573-5 ) .

Etymology: Named in honor of the late Professor Dr. Ernst Josef Fittkau for his many contributions to the taxonomy and ecology of Neotropical chironomids.

Diagnostic characters: See key.

Description

Male (n = 1–2). Total length 4.47–4.57 mm. Wing length 1.98–2.04 mm. Total length / wing length 2.19–2.31. Wing length / length of profemur 1.48– 1.55.

Coloration. Thorax brown; head, legs and abdomen paler brown. Wing translucent.

Antenna. AR 2.07–2.10. Ultimate flagellomere 890–931 µm long.

Head. Temporal setae 18–22, partly biserial, including 3–4 inner verticals, 8–9 outer verticals and apparently 6–8 postorbitals. Clypeus with 11–14 setae. Tentorium 144–154 µm long; 41–45 µm wide. Stipes 135–139 µm long; 12–14 µm wide. Palp segment lengths (in µm): 33–35, 49–51, 84– 88, 105–113, 166–176. Third palpomere with 4–5 sensilla, longest 22–24 µm long.

Thorax. Antepronotum without setae. Dorsocentrals 6–7, acrostichals not discernible, prealars 2–3. Scutellum with 8–9 setae.

Wing ( Fig. 11A ). VR 1.12–1.13. Brachiolum with 1–2 setae, R 25–26, R 1 with 23–26, R 4+5 with 21– 27 setae, other veins and cells bare. Squama with 5–7 setae.

Legs. Scale of fore tibia 49–51 µm long, spur of mid tibia 54–57 µm long including 30–32 µm long comb, spurs of hind tibia 50–52 µm long and 44– 46 µm long including 29–30 µm long comb. Width at apex of fore tibia 55–58 µm, of mid tibia 57–58 µm, of hind tibia 62–66 µm. Lengths and proportions of legs as in Table 4 .

Hypopygium ( Figs 11B, C ). Tergite IX covered with microtrichia; laterosternite IX with 1–3 setae. Anal point spatulate, 48–55 µm long, 9–10 µm wide at base, 15–16 µm wide subapically, with 5–8 setae to each side of the base, of which about half on the ventral side. Transverse sternapodeme 39–46 µm long, straight. Phallapodeme 86–88 µm long. Gonocoxite 162–170 µm long. Superior volsella in dorsal view ( Fig. 11D ) straight, 91–95 µm long; ventral lobe subrectangular; dorsal lobe slightly shorter, with bare, hooked posterior projection and 4–5 lateral setae. Inferior volsella 133–148 µm long, 18–21 µm wide at base, 9–10 µm wide at its narrowest, with 17–19 µm long, rounded dorsal projection starting 66–77 µm from base; distal half tapering, 21–23 µm wide basally, 8–10 µm wide subapically, with 17–19 simple setae, longest apical seta 59–62 µm long. Gonostylus 193–197 µm long. HR 0.83–0.89. HV 2.32–2.35.

Female and immatures. Unknown.

Distribution and ecology

Collected in Mato Grosso and Pará States.

Figures

Figure 11. Sigmoitendipes fittkaui n. sp., male. A, Wing. B, Hypopygium, dorsal view. C, Hypopygium with anal point and tergite IX removed, dorsal aspect to the left and ventral aspect to the right. D, Superior volsella.