Lopescladius (Cordiella) uncatus, 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 : 46-48

Lopescladius (Cordiella) uncatus sp. n.

( Figs 17–21 )

Type material. Holotype male, BRAZIL: São Paulo, Estação Biológica Boracéia, Rio Claro, 2nd bridge, 09.xii.2002, light trap, H.F. Mendes & C.G. Froehlich ( MZUSP).

Diagnostic characters. The species is pale brown, has a wing length of 0.71 mm, antennal ratio of 0.30 and the posterior branch of the superior volsella is hooked apically and projecting orally.

Etymology. From Latin uncus, hook, angle, using the suffix -atus, provided with, referring to the apically hooked main branch of the superior volsella.

Description (male, n = 1). Total length 1.37 mm. Wing length 714 µm. Total length / wing length 1.92. Wing length / length of profemur 2.58.

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

Head. Antenna with 13 flagellomeres, ultimate flagellomere 97 µm long. AR 0.30. Temporal setae 7, weak; in single, irregular line posterior on head. Clypeus with 4 setae. Tentorium, stipes and cibarial pump as in Figure 17 . Tentorium 106 µm long, 18 µm wide. Stipes 73 µm long, 5 µm wide. Palpomere lengths / widths (in µm): 14 / 15, 16 / 13, 30 / 14, 36 / 11, 61 / 7. Third palpomere with 1 sensillum subapically, 11 µm long.

Thorax ( Fig. 18 ). Antepronotal 1, weak; dorsocentrals 2; prealars 2. Scutellum with 2 setae.

Wing ( Fig. 19 ). VR 1.55. Costal extension 8 µm long; false costal extension about 72 µm long. Brachiolum with 1 seta, other veins bare. Squama bare.

Legs. Spur of fore tibia 20 µm long. Mid tibia with 1 spur, 23 µm long. Hind tibia with 1 spur, 27 µm long and comb of 11 setae, shortest seta 7 µm long, longest 16 µm long. Lengths and proportions of legs as in Table 3.

fe ti ta1 ta2 ta3 ta4 ta5 LR BV SV BR p1 277 297 68 27 15 10 18 0.22 9.13 8.43 – p2 – – – – – – – – – – – p3 – 299 77 41 18 9 17 0.26 – – –

Abdomen. Tergite I without seta, tergites II–IV with 1 strong median seta, tergites V–VII with 1 strong median and 1 weaker lateral setae on each side, tergite VIII with 2 strong median and 1 weaker lateral setae on each side. Sternite I without seta, sternite II with 1 strong median and 1 weaker lateral setae on each side, sternites III–IV without setae, sternites V–VIII with 1 median seta.

Hypopygium ( Figs 20–21 ). Tergite IX with rounded, lateral protrusions, each with 5 setae (1 very strong and 4 weaker); posterior margin broadly rounded. Phallapodeme 34 µm long; transverse sternapodeme 32 µm long. Gonocoxite 57 µm long. Superior volsella double; anterior branch nail-shaped, 8 µm long, 4 µm wide medially; posterior branch digitiform with apical hook, 33 µm long, 7 µm wide medially. Gonostylus 22 µm long. HR 2.63. HV 6.36.

Remarks. L. (C.) uncatus sp. n. is a small, pale brown species. It can easily be recognized on the shape of the posterior branch of the superior volsella, which is hooked apically and projecting orally; in the other described species this volsella is gently curved and projecting anteromedially.

Female, pupa and larva. Unknown.

Distribution and biology. The single specimen was collected in a light trap close to a third order stream in a fragmented Mata Atlântica forest in São Paulo State in southeastern Brazil.

Figures

FIGURES 17 – 21. Lopescladius (Cordiella) uncatus sp. n., male. 17 — tentorium, stipes and cibarial pump; 18 — thorax; 19 — wing; 20 — hypopygium with tergite IX removed, dorsal aspect to the left and ventral aspect to the right; 21 — hypopygium, dorsal aspect.