Uirassubrillia beckeri, Mendes, Humberto Fonseca, Andersen, Trond & Pinho, Luiz Carlos, 2013

Mendes, Humberto Fonseca, Andersen, Trond & Pinho, Luiz Carlos, 2013, Uirassubrillia beckeri gen. n., sp. n. (Diptera: Chironomidae, Orthocladiinae) from northeastern Brazil, Zootaxa 3716 (1), pp. 65-74 : 69-73

Uirassubrillia beckeri sp. n.

( Figs 1–17 )

Type material. Holotype male, Brazil: Bahia, Camacan, Reserva Particular de Patrimônio Natural (RPPN) Serra Bonita, Tributary of Panelão River, 15°23’28”S, 39°33’56”W, vii–viii.2009, Malaise trap, A.R. Calor et al. (MZUSP). Paratypes: 2 males and 3 females, same data as holotype. 1 female, same as holotype except 01.vii.2008, light trap. 3 males, same as holotype except 15°23’40”S, 39°33’39’’W, 01.xi.2009, light trap. 1 male, same as holotype except 15°23’40”S, 39°33’39’’W, 03.ii.2009, light trap. 9 males, same as holotype except 15°23’40”S, 39°33’39’’W, 03.xi.2009, light trap. 3 males, same as holotype except tributary to Braço do Sul River, 15°23’03”S, 39°34’00’’W, xii.2008 - i.2009. 1 male and 1 female, same as previous except v-vi.2009 (MZUSP, MZUFBA & ZMBN).

Diagnostic characters. See diagnostic characters for genus.

Etymology. The species is named in honor of Dr. Victor Becker for his contribution to the preservation of the Serra Bonita region in southern Bahia and for allowing us to carry out field work within the Instituto Uiraçu dependencies.

Description. Male (n = 2–3, if not otherwise stated). Total length 3.03–3.54 mm. Wing length 1.51–1.69 mm. Total length / wing length 1.85–2.01. Wing length / length of profemur 1.80–1.88.

Coloration. Thorax, abdomen, legs, head and antennae pale brown, coxae and scutellum slightly darker brown; wings translucent.

Head ( Fig. 1 ). AR 1.07–1.16. Ultimate flagellomere 424–470 µm long. Temporal setae 28–37; inner and outer verticals not well differentiated in two specimens, a third specimen has only 5–6 temporal setae divided into 3 inner verticals and 2–3 outer verticals. Clypeus with 18–28 setae in two specimens, a third with only 1 seta on clypeus. Tentorium, stipes and cibarial pump as in Figure 2 . Tentorium 127–140 µm long, 27–32 µm wide. Stipes 120–129 µm long, 35(1) µm wide. Palp segment lengths (in µm): 32–39, 41–54, 152–192, 129–138, 132–143. Third palpomere with 4–7 scattered sensilla clavata in apical one-third, longest 14–18 µm long. Labrum with 6–8 stout setae in two specimens and a third specimen with 3 stout setae; and 20–23 hair-like setae in two specimens and a third specimen with only 6 hair-like setae.

Thorax ( Fig. 3 ). Antepronotum with 2–9 dorsomedian and 2–4 ventrolateral setae. Dorsocentrals 17–46, starting close to antepronotum; prealars 5–12; supraalars 1–2. Scutellum with 11–13 posterior setae in single row and 1–2 anterior setae.

Wing ( Fig. 4 ). VR 1.59–1.65. C extension 132–140 µm long. Brachiolum with 4 setae; C extension with about 30–50 non-marginal setae; R with about 40–60; R1 with about 60–80; R4+5 with about 100–140; RM with 15–17; M with about 15–25; M1+2 with about 130–150; M3+4 with about 70–80; Cu with about 70–110; Cu1 with about 45–50; Pcu with about 105–120; and An with about 70–90 setae; Sc bare. Wing membrane with 20–25 setae in cell m proximal to RM, other cells extensively setose. Squama with 6–9 setae.

Legs. Spur of fore tibia 36–45 µm long; spurs of mid tibia 59–70 µm and 54–64 µm long; spurs of hind tibia 73–79 µm and 47–66 µm long. Width at apex of fore tibia 36–43 µm; of mid tibia 41–45 µm; of hind tibia 45–50 µm. Comb composed of 6 thin setae, longest 64–82 µm long, shortest 50–52 µm long. Lengths and proportions of legs as in Table 1 .

Hypopygium (Figs 5–8). Tergite IX with 18–29 setae in two lateral groups of 7–15 setae; laterosternite IX with 2–5 setae. Phallapodeme 57–61 µm long; transverse sternapodeme 11–16 µm long. Gonocoxite 134–157 µm long. Superior volsella 63–82 µm long; 11–14 µm wide at its widest point. Inferior volsella composed of 4–5 strong setae on low protuberance, longest 32–39 µm long. Gonostylus 77–95 µm long; true megaseta absent, with 5–7 strong setae apically, longest 47–50 µm long, shortest 20–32 µm long; and 3–5 setae basally on ventral side, all fallen off. HR 1.59–1.97. HV 3.62–4.06.

Female (n = 2–3, if not otherwise stated). Total length 2.53–3.12 mm. Wing length 1.56–1.69 mm. Total length / wing length 1.63–1.87. Wing length / length of profemur 1.79–1.86.

Coloration. Thorax, abdomen, legs, head and antennae pale brown, coxae and scutellum slightly darker brown; wings translucent.

Head ( Fig. 9 ). AR 0.33–0.36. Flagellomere length / width (in µm): 100–102 / 23–27, 68–70 / 24–27, 69–73 / 23–27, 59–66 / 25, 98–111 / 18–20; pedicel with 6–8 setae ventrally. Temporal setae 26–34; inner and outer verticals not well differentiated. Clypeus with 32–52 setae. Tentorium, stipes and cibarial pump as in Figure 10 . Tentorium 107–136 µm long; 20–24 µm wide. Stipes 116–123 µm long; 30(1) µm wide. Palp segment lengths (in µm): 32–36, 41–52, 175–182, 118–138, 136–179. Third palpomere with 6–7 sensilla clavata in apical third, longest 16–18 µm long. Labrum with 5–7 stout setae and 15–19 hair-like setae.

Thorax ( Fig. 11 ). Antepronotum with 6–7 dorsal setae, 3–5 median and 4–5 ventrolateral setae. Dorsocentrals 47–63, starting close to antepronotum; prealars 10–14; supraalar 1. Scutellum with 12 posterior setae in single row and 0–2 anterior setae.

Wing ( Fig. 12 ). VR 1.70–1.85. C extension 141–150 µm long. Brachiolum with 5–8 setae; C extension with about 50–70 non-marginal setae; R with about 40–60; R1 with about 65–85; R4+5 with about 140–160; RM with 10– 17; M with about 20–30; M1+2 with about 150–170; M3+4 with about 90–110; Cu with about 70–100; Cu1 with about 45–55; Pcu with about 100–150; and An with about 40–70 setae; Sc bare. Wing membrane with 40–90 setae in cell m proximal to RM, other cells extensively setose. Squama with 7–10 setae.

Legs. Spur of fore tibia lacking; spurs of mid tibia 57–73 µm and 57–61 µm long; spurs of hind tibia 70–79 µm and 50–59 µm long. Width at apex of fore tibia 36–45 µm; of mid tibia 41–45 µm; of hind tibia 43–51 µm. Comb composed of 6 thin setae, longest 73–77 µm long, shortest 45–61 µm long. Lengths and proportions of legs as in Table 2 .

Genitalia ( Figs 13–17 ). Gonocoxapodeme with main branch on dorsomesal lobe, with distinct connection anterior of vagina. Gonocoxite IX with 15–20 strong setae, 59–61 Μm long. Tergite IX with 40–53 setae in two distinct groups of 18–33 setae. Cercus 95–109 Μm long. Larger seminal capsules round, 48–70 Μm long, including 7–10 Μm long neck, 3 Μm wide at apex; smaller seminal capsule 27–38 Μm long. Notum 168–195 Μm long. Dorsomesal lobe 14–16 Μm long from gonocoxapodeme to apex. Ventrolateral lobe subquadrangular, 57–61 Μm long, 54–59 Μm wide at its widest point, covered with microtrichia.

Immature stages. Unknown.

Habitat. The material was collected in Malaise traps along small streams in the Uiraçu Nature Reserve in southern Bahia State. The reserve of about 1800 hectares forms an ecological corridor of primary and secondary forests (30 years or older) of Mata Atlântica varying from 200 to 950 m above sea level. The area is managed by Instituto Uiraçu (http://www.uiracu.org.br/) and even though it is privately owned, it is an area of permanent protection.

The specimens were collected during a project on the biodiversity of aquatic insects carried out in the nature reserves in Serra Bonita by Dr. Adolfo R. Calor.

Figures

FIGURES 1 – 4. Uirassubrillia beckeri gen. n., sp. n., male. 1 – head. 2 – tentorium, stipes and cibarial pump. 3 – thorax. 4 – wing.

FIGURES 9 – 12. Uirassubrillia beckeri gen. n., sp. n., female. 9 – head. 10 – tentorium, stipes and cibarial pump. 11 – thorax. 12 – wing.

FIGURES 13 – 17. Uirassubrillia beckeri gen. n., sp. n., female. 13 – genitalia, ventral view. 14 – tergite IX. 15 – ventrolateral lobe. 16 – dorsomesal lobe. 17 – apodeme lobe.

Tables

TABLE 1. Lengths (in µm) and proportions of legs of Uirassubrillia beckeri gen. n., sp. n., male (n = 2 – 3).

	fe	ti	ta1 ta2 ta3	ta4
p1	838–958	820–939	829–958 387–456 313–332	239–267
p2	884–1013	635–718	433–507 184–203 134–163	83–92
p3	884–1013	820–912	543–635 276–313 221–249	120–138
	ta5	LR	BV SV	BR
p1	74–92	1.01–1.02	2.46–2.49 1.98–2.00	4.8–5.2
p2	55–64	0.68–0.70	4.28–4.40 3.42–3.57	9.4–9.7
p3	64–74	0.66–0.68	3.28–3.33 3.12–3.17	8.7–9.8

TABLE 2. Lengths (in µm) and proportions of legs of Uirassubrillia beckeri gen. n., sp. n., female (n = 2 – 3).

	fe	ti	ta1 ta2 ta3	ta4
p1	838–939	801–903	857–958 409–470 313–350	230–276
p2	921–995	663–737	442–488 170–184 125–129	74–83
p3	939–1013	792–912	530–599 243–286 203–230	101–120
	ta5	LR	BV SV	BR
p1	64–106	1.06–1.09	2.33–2.45 1.86–1.92	5.0
p2	50–55	0.66–0.67	4.53–4.92 3.55–3.58	8.2 (1)
p3	64–70	0.65–0.67	3.47–3.69 3.21–3.27	6.5–8.5