Sigmoitendipes spiesi, 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 : 50-52

Sigmoitendipes spiesi new species

http://zoobank.org/ E46663A0-94FA-4039-BE72- 224D1FD45D21

Type material: Holotype: BRAZIL, Mato Grosso, Nova Xavantina, Fazenda Sr. Queté, Córrego Cachoeira, 14°32.817’S 52°31.395’W, 16.x.2007, light trap, LC Pinho et al., 1 male ( MZUSP) . Paratype: BRAZIL, Mato Grosso, Nova Xavantina, Fazenda Sr. Queté, Córrego Voadeira, 14°41.577’S 52°27.203’W, 13.x.2007, 1 male ( UFSC) .

Etymology: Named after Martin Spies for his important contributions to the taxonomy and ecology of Neotropical chironomids.

Diagnostic characters: See key.

Description

Male (n = 1–2). Total length 4.64–5.52 mm. Wing length 2.00– 2.12 mm. Total length / wing length 2.38–2.60. Wing length / length of profemur 1.74– 1.78.

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

Antenna. AR 1.93–1.95. Ultimate flagellomere 867–915 µm long.

Head. Temporal setae 11–14 including 3 inner verticals, 5 outer verticals and 3–6 postorbitals. Clypeus with 15 setae. Frontal tubercle indicated as paler area. Tentorium 147–156 µm long, 35–37 µm wide. Stipes 155–180 µm long; 11–12 µm wide. Palp segment lengths (in µm): 41–45, 52– 72, 87–96, 107–111, 172. Third palpomere with 5–6 sensilla, longest 25–27 µm long.

Thorax. Antepronotum without setae. Dorsocentrals 6–7, acrostichals apparently 6, prealars 3–5. Scutellum with 7–9 setae in single row.

Wing ( Fig. 14A ). VR 1.12. Brachiolum with 2 setae, R with 25–26, R 1 with 27–28, R with 30–31 setae, other veins and cells bare. Squama with 8 setae.

4+5

Legs. Scale of fore tibia 50–55 µm long; spur of mid tibia 55–65 µm long including 25–37 µm long comb; spurs of hind tibia 52–54 µm and 45–47 µm long including 25–29 µm long comb. Width at apex of fore tibia 55–57 µm; of mid tibia 60–62 µm; of hind tibia 65–70 µm. Lengths and proportions of legs as in Table 7 .

Hypopygium ( Figs 14B, C ). Tergite IX covered with microtrichia; laterosternite IX with 2 seta. Anal point spatulate, 29–37 µm long, 10–11 µm wide at base, 15–17 µm wide subapically, with 7–8 setae to each side of the base of which 3–4 on the ventral side. Transverse sternapodeme 44–50 µm long, straight. Phallapodeme 100–106 µm long. Gonocoxite 169–189 µm long. Superior volsella ( Fig. 14D ) 89–109 µm long, with subrectangular, 47–55 µm long, 27–33 µm wide, setose lobe with 2–3 apical setae; with 40–47 µm long, apically hooked, dorsal lobe with 4 setae. Inferior volsella 144–159 µm long; 20–21 µm wide at base; 10–11 µm wide at its narrowest; with 25–27 µm long, dorsal, rounded projection, starting 82–88 µm from base; apically subrectangular, 15–18 µm wide; with 18–19 simple setae, longest apical seta 85–97 µm long. Gonostylus 199–219 µm long. HR 0.85–0.86. HV 2.33–2.52.

Female and immatures. Unknown.

Distribution and ecology

Only known from Mato Grosso State, where it was collected in a light trap at a small, rather slow flowing stream with mostly fine bottom sediments.

Figures

Figure 14. Sigmoitendipes spiesi 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.