Ubatubaneura atlantica, Wiedenbrug, Sofia & Trivinho-Strixino, Susana, 2009

Wiedenbrug, Sofia & Trivinho-Strixino, Susana, 2009, Ubatubaneura, a new genus of the Corynoneura group (Diptera: Chironomidae: Orthocladiinae) from the Brazilian Atlantic Forest, Zootaxa 1993, pp. 41-52 : 47-50

Ubatubaneura atlantica n. sp.

(Figs 1–4)

Type material. Holotype male, with pupal exuviae and larval skin, BRAZIL: São Paulo, Ubatuba, Sertão da Quina, upstream of Cachoeira da Renata, 23o30.789'S, 45o14.442'W, 61 m a.s.l., 04.i.2008, S. Wiedenbrug ( MZUSP). Paratypes: Allotype female, with pupal exuviae and larval skin, São Paulo, Ubatuba, stream beside Ruínas da Lagoinha, 23o30.468'S, 45o11.923'W, 0 m a.s.l., 17.xi.2007, S. Wiedenbrug ( ZSM); one male with pupal exuviae and larval skin, one pharate male pupa with larval skin, data as for allotype; one male with pupal exuviae and larval skin, data as for allotype except for 02.i.2008; one pharate male pupa with larval skin, São Paulo, Sertão da Quina, Sítio Santa Cruz, Cachoeira do Engenho, 23o31.068'S, 45o14.845'W, 23 m a.s.l., 08.x.2007, S. Wiedenbrug ( MZUSP, ZSM).

FIGURE 1. Ubatubaneura atlantica n. sp., male. A —head. B —hypopygium; tergite IX indicated, sclerites hatched; left: dorsal view, right: ventral view. C —wing. D —terminal flagellomere. E —apex of midtibia. F —apex of hind tibia. G —apex of ta1 of midleg. H —apex of ta1 hind leg. I —coxa and trochanter of hind leg. J —coxa and trochanter of foreleg.

Etymology. Named after the Atlantic Forest.

Diagnostic characters. See generic diagnosis.

Male (n = 1–3). Total length [695] μm. Wing length [495] μm. Total length / wing length [1.40]. Wing length / length of profemur [2.8].

Color (in alcohol). Apex of antenna and pedicel brown, palp white, remainder of head pale brown. Wing with arculus dark brown, remainder hyaline. Legs pale brown. Thorax with vittae, postnotum and preepisternum brown, remainder pale brown. First abdominal segment white, remainder of abdomen pale brown.

Head (Fig. 1A). AR [0.27] 0.29–0.30. Terminal flagellomere (Fig. 1D) [73] 73–78 µm long. Temporal setae: 1 outer vertical / post orbital. Clypeus with 7–8 setae. Tentorium and cibarial pump as in Figure 1A. Tentorium [93] 53–88 µm long, [10] µm wide. Palpomere lengths (in µm): [10] 10, [8] 5–10, [15] 15–18, [20] 18, [38] 35–38.

Thorax. Antepronotum without setae, dorsocentrals 4–5, prealars 2. Scutellum with 2 setae.

Wing (Fig. 1C). VR 2.00. Clavus [147] µm long, [27] µm wide.

Legs (Fig. 1E–J). Spur of foretibia [7] 7 µm long; spurs of midtibia [7] 7 and [7] 12 µm long; of hind tibia [7] 10 and [30] 37 µm long. Width at apex of foretibia [15] 17 µm; of midtibia [15] µm; of hind tibia [25] 27 µm. Lengths and proportions of legs as in Table 1.

Abdomen. Tergite I lacking, T II–V each with 1 median seta, T VI–VII with 2–3 setae in single row, T VIII without setae.

Hypopygium (Fig. 1B). Tergite IX with 2 weak setae. Phallapodeme [22] 20 µm long; transverse sternapodeme [20] 20–22 µm long. Gonocoxite [61] 61 µm long. Gonostylus [25] 20–22 µm long; megaseta [4] 3–4 µm long. HR [2.44] 2.77–3.05; HV [2.78].

Female (n = 1). Total length 1092 μm. Wing length 586 μm. Total length / wing length 1.86. Wing length / length of profemur 3.45.

Head. AR 0.34. Terminal flagellomere 42 µm long. Temporal setae: 1 outer vertical / post orbital. Clypeus with 8 setae. Tentorium 55 µm long. Palpomere lengths (in µm): 12, 12, 17, 22, 35.

Thorax. Antepronotum without setae, dorsocentrals 6, prealars 2. Scutellum with 1 seta.

Wing ( Fig. 2 A). VR 1.02. Clavus 303 µm long, 42 µm wide.

Legs. Spur of foretibia 7 µm long; spurs of midtibia 7 and 10 µm long; of hind tibia 30 and 35 µm long. Width at apex of foretibia 17 µm; of midtibia 17 µm; of hind tibia 22 µm. Lengths and proportions of legs as in Table 2.

TABLE 2. Lengths (in µm) and proportions of legs of Ubatubaneura atlantica n. gen., n. sp., female (n=1).

Genitalia ( Fig. 2 B–F). Gonocoxite IX with three setae. Cercus 20 µm long. Seminal capsule 57 µm long; 37 µm wide. Notum 37 µm long.

Pupa (n = 4–6, except when otherwise stated). Total length [1.11] 1.18–1.39 (3) mm.

Cephalothorax. Frontal setae ( Fig. 3 A) strong, [112] 112–132 µm long. Longest postorbitals 87 µm and 30 µm long; longest median antepronotals 12 µm and 42 µm long; longest precorneal setae Pc1 17 µm long, Pc2 25 µm long, Pc3 25 µm long; dorsocentrals Dc1 [25] 12–25 µm long; Dc2 [7] 10–17 µm long; Dc3 [115] 80–88 µm long and strong; Dc4 [7] 7–15 µm long ( Fig. 3 B). Wing sheath with one or two rows of 6–19 pearls ( Fig. 3 C).

Abdomen ( Fig. 3 D–F). Shagreen and chaetotaxy as in generic diagnosis. Longest L-setae on segment IV 22 µm long, longest LS-setae on segment IV 70 µm long. Conjunctive II/III with [8] 5–8 hooklets; III/IV with [8] 6–9 hooklets; IV/V with [6] 6–8 hooklets; V/VI with [5] 5–8 hooklets; VI/VII with [4] 4 hooklets. Anal lobe fringe with [11] 11–13 taeniate setae; [250] 260–350 µm long. Anal macrosetae [62] 62–67 µm long; median setae [70] 60–100 µm long.

Larva (n = 4–6, except when otherwise stated). Head capsule [172] 167 (2) µm long, 25 (1) µm wide, length / width 1.34 ( Fig. 4 F). Ventral head length [125] 122–130 µm.

Head ( Fig. 4 B–C). Lengths of antennal segments I–V (in µm): [50] 47–55, [15] 15–17, [4] 5, [2] 1–2, [5] 5–6. First antennal segment [10] 7–10 µm wide; antennal blade [15] 15–20 µm long; accessory blade [9] 7–10 µm long; ring organ at [17] 15–17 µm from base of first antennal segment ( Fig. 4 A). Mandible ( Fig. 4 E) [53] 50–58 µm long. Mentum ( Fig. 4 D) [27] 30–32 µm wide; distance between setae submentalis [32] 27–32 µm. Body. Longest body seta near anterior parapods 47 µm (2) long, sub-basal seta on posterior parapod [30] 37 (2) µm long ( Fig. 4 G). Anal setae [137] 137–175 µm long.

Ecology and distribution. The larvae were collected from stone surfaces in fast flowing 2nd and 3rd order streams in the Atlantic Forest near the south-eastern coast of Brazil. The steep hillsides surrounding these streams are still forested. However, the area experiences increasing urbanization and products based on Bacillus thuringiensis var. israelensis are used in the streams to control the black fly populations.

The pupal morphotypes " Corynoneura Gruppe spec. 1" ( Wiedenbrug 2000), collected in South Brazil and "ET 156" (Ospina Torres 1992), collected in the State of Amazonas both belong to the genus Ubatubaneura and indicate a wider distribution of the genus. However, associated adults are necessary to evaluate whether these morphotypes represent additional new species.

Figures

FIGURE 2. Ubatubaneura atlantica n. sp., female. A — wing. B — genitalia, ventral view. C — genitalia, dorsal view. D — detail of sternite VIII and gonapophysis, left: ventral view, right: ventral view with gonapophysis removed. E — labium. F — apodeme lobe.

FIGURE 3. Ubatubaneura atlantica n. sp., pupa. A — frontal apotome, antennal and eye sheaths. B — thorax, lateral view. C — wing sheath, distal margin. D — abdomen, dorsal view. E — sternites I – VIII. F — anal lobe, ventral view.

FIGURE 4. Ubatubaneura atlantica n. sp., larva. A — antenna. B — labrum, dorsal view. C — epipharyngeal region, ventral view. D — mentum. E — mandible (seta interna not drawn). F — head capsule, dorsal view. G — sub-basal seta of posterior parapod.