Lopescladius (Cordiella) morosus, Hagenlund, Linn K., Andersen, Trond & Mendes, Humberto F., 2010

Hagenlund, Linn K., Andersen, Trond & Mendes, Humberto F., 2010, New species of Lopescladius (Cordiella) Coffman et Roback (Chironomidae: Orthocladiinae) from Brazil, Zootaxa 2728, pp. 39-49 : 41-44

Lopescladius (Cordiella) morosus sp. n.

( Figs 1–11 )

Type material. Holotype male, BRAZIL: Pará, Rurópolis, Rio Tambor, 29.x.2007, Pennsylvania trap, N. Hamada et al. ( INPA). Paratypes, 5 males, as holotype. 6 males, Pará, Rurópolis, Cachoeira do Grin, 04°05'S, 55°00'W, 24.vi.2007, Pennsylvania trap, N. Hamada et al. ( INPA, ZMBN, MZUSP).

Diagnostic characters. The species is pale brown, has a wing length of about 0.78 mm, antennal ratio of 0.49 and the main branch of the superior volsella is gently curved and projecting anteromedially.

Etymology. From Latin morosus , gloomy, referring to the facial expression of the species.

Description (male, n = 8–11, except where otherwise stated). Total length 1.63–1.93, 1.80 mm. Wing length 746–838, 782 µm. Total length / wing length 2.13–2.46, 2.32. Wing length / length of profemur 2.46– 3.27, 2.90.

Coloration. Head pale yellowish, thorax and abdomen pale brown, legs pale yellowish.

Head ( Fig. 1 ). Antenna with 13 flagellomeres, ultimate flagellomere 137–169, 153 µm long. AR 0.43– 0.54, 0.49. Temporal setae 5–9, 7, weak; in single irregular line posterior on head. Clypeus with 2–4, 2 setae. Tentorium, stipes and cibarial pump as in Figure 2 . Tentorium 89–111, 102 µm long; 7–9, 8 µm wide. Stipes 64–93, 82 µm long; 5–10, 7 µm wide. Palpomere lengths / widths (in µm): 12–14, 13 / 17–18, 17; 14–19, 17 / 14–16, 15; 25–33, 28 / 14–17, 15; 34–45, 40 / 11–14, 12; 50–65, 55 / 9–14, 10. Third palpomere with 1 sensillum medially to subapically; 6–16, 11 µm long.

Thorax ( Fig. 3 ). Antepronotals 1–2, 1; dorsocentrals 2–4, 3; prealars 1–2, 2. Scutellum with 2 setae.

Wing ( Fig. 4 ). VR 1.17–1.48, 1.33. Costal extension 5–22, 15 µm long; false costal extension 71–143, 119 µm long. Brachiolum with 1 seta, other veins bare. Squama bare.

Legs. Spur of fore tibia 26–30, 28 µm long ( Fig. 5 ). Mid tibia with 1 spur, 25–30, 28 µm long ( Fig. 6 ). Hind tibia with 1 spur, 32–36, 34 µm long and comb of 9–12, 11 setae; shortest seta 5–9, 7 µm long; longest 11–16, 15 µm long ( Fig 7 ). Width at apex of fore and mid tibia 22–25, 23 µm; of hind tibia 25–29, 27 µm. Tarsomere four of all legs cordiform ( Fig. 8 ). Lengths and proportions of legs as in Table 1.

Abdomen ( Fig. 9 ). Tergite I without setae; tergites II–IV with 1 strong median seta and 0–1, 0 weaker lateral seta on each side; tergites V–VI with 1 strong median seta and 0–1, 1 weaker lateral seta on each side; tergite VII with 1 strong median seta and 1 weaker lateral seta on each side; tergite VIII with 1–2, 1 strong median seta and 1–2, 1 weaker lateral seta on each side. Sternite I without seta; sternites II–III with 0–1, 0 strong median seta; sternite IV with 0–2, 1 strong median seta; sternites V–VI with 1–2, 1 strong median seta; sternite VII with 1–3, 2 strong median setae, sternite VIII with 2–3, 2 strong median setae.

Hypopygium ( Figs 10–11 ). Tergite IX with rounded lateral protrusions, each with 4–5 setae (1–2 strong and 3–4 weaker); posterior margin broadly rounded. Phallapodeme 36–43, 39 µm long; transverse sternapodeme 25–42, 34 µm long. Gonocoxite 81–91, 85 µm long. Superior volsella double; anterior branch nail-shaped; 15–19, 17 µm long; 4–6, 5 µm wide medially; posterior branch digitiform, curved; 35–42, 38 µm long; 7–11, 9 µm wide medially. Gonostylus 37–43, 39 µm long. HR 2.07–2.22, 2.15. HV 4.33–5.69, 5.23.

Remarks. L. (C.) morosus sp. n. is a small, pale brown species. It can be separated from L (C.) hyporheicus Coffman et Roback by having a wing length of 0.75–0.84 mm, while L (C.) hyporheicus has a wing length of 1.07–1.10 mm and by having a nail-shaped anterior branch of the inferior volsella, while this branch apparently is lacking in L (C.) hyporheicus . It can be separated from L. (C.) vibrissatus sp. n. on the pale brown color and the much smaller size; L. (C.) vibrissatus sp. n. is much darker and has a wing length of 1.20–1.22 mm. It groups with L. (C.) uncatus sp. n. on its pale brown color and small size, but the two species can easily be separated as the posterior branch of the superior volsella is gently curved and projecting anteromedially, while this volsella is hooked apically and projecting orally in L. (C.) uncatus sp. n.

Female, pupa and larva. Unknown.

Distribution and biology. The specimens were taken in Pennsylvania traps situated close to large streams in the Amazon forest in Pará State in northern Brazil.

Figures

FIGURES 1 – 8. Lopescladius (Cordiella) morosus sp. n., male. 1 — head; 2 — tentorium, stipes and cibarial pump; 3 — thorax; 4 — wing; 5 — apex of fore tibia; 6 — apex of mid tibia; 7 — apex of hind tibia; 8 — tarsi 3 – 5 of fore leg.

FIGURES 9 – 11. Lopescladius (Cordiella) morosus sp. n., male. 9 — abdomen, dorsal aspect; 10 — hypopygium with tergite IX removed, dorsal aspect to the left and ventral aspect to the right; 11 — hypopygium, dorsal aspect.