Saetherocladius urubiciensis, Andersen, Trond, Mendes, Humberto F. & Pinho, Luiz C., 2010

Andersen, Trond, Mendes, Humberto F. & Pinho, Luiz C., 2010, Four new species of Saetherocladius Andersen et Mendes from Mata Atlântica, Brazil (Diptera: Chironomidae: Orthocladiinae), Zootaxa 2608, pp. 45-56 : 53-55

Saetherocladius urubiciensis sp. n.

( Figs 20–25 )

Type material. Holotype male, slide mounted in Canada balsam. Brazil: Santa Catarina State, Urubici, Morro da Igreja, 1.822 m a.s.l., 18.ix.–5xii.2004, Malaise trap, cloud forest, L.C. Pinho & L.E.M. Bizzo ( MZUSP). Paratypes: 3 males, as holotype ( MZUSP, ZMBN).

Diagnostic characters. The species can be separated from the other species in the genus by the following combination of characters: AR 0.73–0.84; virga 24–26 µm long; inferior volsella bluntly triangular, with dorsal microtrichia; gonostylus with strong, setose outer projection and anal point tapering.

Etymology. The name refers to the type locality.

Male (n = 3–4, except when otherwise stated). Total length 1.62–2.04, 1.91 mm. Wing length 1.09–1.21 mm. Total length / wing length 1.48–1.73. Wing length / length of profemur 2.51–2.64.

Coloration. Thorax and head brown; legs, abdomen and antennae light brown.

Head. AR 0.73–0.84, 0.80. Ultimate flagellomere 257–302, 287 µm long. Temporal setae 7–8, 7 including 3–4, 4 inner verticals; 3 outer verticals and 0–1, 1 postorbital. Clypeus with 5–6, 5 setae. Tentorium, stipes and cibarial pump as in Figure 20 . Tentorium 104–118, 112 µm long; 17–24, 20 µm wide at sieve pore. Stipes 95–107, 98 µm long; 32 (1) µm wide. Palp segment lengths / widths (in µm): 13–16, 15 / 13–15, 14; 29–36, 34 / 13–16, 15; 73–82, 77 / 20–24, 22; 63–67, 65 / 17–19, 18; 109–127, 118 / 14. Third palpomere with 4–6, 5 sensilla clavata subapically; longest 10–14, 13 µm long.

Thorax ( Fig. 21 ). Antepronotum with 2–4, 3 setae. Dorsocentrals 13–17, 14; acrostichals 9–18, 16 starting close to antepronotum; prealars divided into 3 posterior and 3–4, 3 anterior setae; supraalar 1. Scutellum with 4–5, 4 setae.

Wing ( Fig. 22 ). VR 1.46–1.54. Costal extension 0–14, 7 µm long. Brachiolum with 1 seta; R with 3–8 setae; R1 with 0–1, 1 seta; other veins bare. Squama with 1–5 setae.

Legs. Spur of fore tibia 50 µm long; spurs of mid tibia 19–23 (2) µm and 10–12 (2) µm long; spurs of hind tibia 41–50, 43 µm and 9–14, 11 µm long. Width at apex of fore tibia 27–28 µm; of mid tibia 27–29 (2) µm; of hind tibia 36–41, 39 µm. Comb with 15–16, 15 setae; longest 32–36, 34 µm long; shortest 15–20, 18 µm long. Lengths and proportions of legs as in Table 5.

fe ti ta1 ta2 ta3 ta4 p1 410–479 482–562 216–245 120–140 67–79 30–42 p2 432–468 425–439 169–191 97–105 58–63 30–32 p3 454–511, 484 497–553, 533 302–353, 329 137–156, 148 119–139, 129 43–52, 48 continued.

ta5 LR BV SV BR

p1 40–43 0.44–0.45 4.13–4.32 4.13–4.18 2.5

p2 36–40 0.40–0.43 4.55–4.63 4.75–5.06 2.7–2.8 p3 43–47, 45 0.60–0.64, 0.62 3.60–3.67, 3.63 2.96–3.16, 3,10 2.6–3.6, 3.1

Hypopygium ( Figs 23–25 ). Anal point 20–27, 23 µm long; 5–7, 6 µm wide at base; 2 µm wide at apex; with 4–10, 8 setae basally. Laterosternite IX with 4–5, 4 setae. Phallapodeme 63–65, 64 µm long; transverse sternapodeme 61–73, 65 µm long. Virga 24–26, 25 µm long. Gonocoxite 120–137, 129 µm long. Gonostylus 65–68, 67 µm long, with large, rounded crista dorsalis and strong, setose outer projection; megaseta 8–11, 10 µm long. HR 1.77–2.07, 1.94. HV 2.46–3.14, 2.88.

Female and immatures. Unknown.

Distribution and ecology. The species was collected in a Malaise trap in a pristine cloud forest at 1.822 m a.s.l. in Santa Catarina State.

Figures

FIGURES 20 – 25. Saetherocladius urubiciensis sp. n., male. 20 — tentorium, stipes and cibarial pump; 21 — thorax; 22 — wing; 23 — anal point and tergite IX and dorsal aspect of left gonocoxite and gonostylus; 24 — hypopygium with tergite IX and anal point removed, dorsal aspect to the left, ventral aspect to the right; 25 — gonostylus with crista dorsalis projecting upwards.