Pseudosmittia uncata, Andersen & Saether & Mendes, 2010

Andersen, Trond, Saether, Ole A. & Mendes, Humberto F., 2010, Neotropical Allocladius Kieffer, 1913 and Pseudosmittia Edwards, 1932 (Diptera: Chironomidae) 2472, Zootaxa 2472 (1), pp. 1-77 : 69-71

Pseudosmittia uncata sp. n.

( Figs 195–200 )

Pseudosmittia sp. 1 Pinho et al. (2009: 164).

Material examined. Holotype male, BRAZIL: Paraná State, Ponta Grossa, Fazenda Paiquerê , 8.ii.2002, Malaise trap, E.A. Nascimento ( MZUSP) . Paratypes: 8 males, as holotype ( MZUSP, ZMBN) . 2 males, Santa Catarina State, São Bento do Sul , 26º19'25.6''S, 48º18'26.5''W, 660 m a.s.l., 13–16.x.2001, Malaise trap, A.P. Dias et al. ( MZUSP, ZMBN) .

Diagnostic characters. The male can be separated from other Neotropical species with bifurcate gonostylus by having the curved secondary lobe of the gonostylus about as long as the main lobe and by the tapering, curved dorsal lobe of median volsella which has microtrichia in basal half and is bare and strongly sclerotized in apical half.

Etymology. From Latin, uncus, hook, and - atus, equipped with, referring to the lobe on the gonostylus.

Male (n = 8–11, except when otherwise stated). Total length 1.33–1.68, 1.50 mm. Wing length 0.83–0.98, 0.90 mm. Total length / wing length 1.46–1.90, 1.63 (7). Wing length / length of profemur 3.08–3.22, 3.16 (5).

Coloration. Fully brown.

Head. AR 0.75–0.99, 0.83. Ultimate flagellomere 230–288, 256 µm long. Temporal setae 5–8, 6; consisting of 3–5, 3 weak inner verticals; 2–3, 2 strong outer verticals and 0–1, 0 postorbitals. Clypeus with 5–9, 8 setae. Tentorium, stipes and cibarial pump as in Figure 195 . Tentorium 68–98, 90 µm long; 13–19, 16 µm wide. Stipes 81–98, 86 µm long, 34 (1) µm wide. Palpomere ( Fig. 196 ) lengths (in µm): 13–18, 16; 23–34, 28; 40–63, 55 (5); 52–68, 61 (5); 68–90 (3). Third palpomere with 2–4, 3 lanceolate sensilla clavata; longest 11– 15, 13 µm long.

Thorax ( Fig. 197 ). Median antepronotal lobes reduced; antepronotum with 1 lateral seta. Dorsocentrals 7– 10, 8; acrostichals 2; prealars 3–4, 3; supraalar absent. Scutellum with 4–7, 6 setae.

Wing ( Fig. 198 ). VR 1.40–1.67, 1.51 (7). Anal lobe reduced. Costal extension 7–34, 20 µm long. R 4+5 ending slightly distal to apex of Cu 1. Cu 1 weakly curved. Brachiolum with 1 seta, other veins bare.

Legs. Spur of fore tibia 23–39, 34 µm long; spurs of mid tibia 18–23, 20 (6) µm and 11–16, 14 µm long; of hind tibia 32–43, 37 (6) µm and 11–18, 16 (6) µm long. Width at apex of fore tibia 16–23, 19 µm; of mid tibia 18–23, 21 (6) µm, of hind tibia 24–30, 27 (7) µm. Comb of 10–11, 11 (7) setae; longest 25–32, 29 (7) µm long; shortest 11–18, 16 (7) µm long. Length and proportions of legs as in Table 26.

Hypopygium ( Figs 199–200 ). Anal point 6–9, 7 µm long. Tergite IX with 10–15, 13 setae. Laterosternite IX with 4–6, 5 setae. Phallapodeme 72–84, 77 µm long; apodeme lobe with about 5 weak wrinkles. Sternapodeme evenly rounded with no trace of oral projections, arched part about 36–41, 39 µm long. Virga narrowly triangular, 18–29, 24 µm long. Gonocoxite 113–136, 124 µm long. Superior volsella 28–29, 29 µm long; 4–6, 5 µm wide at base; digitiform with bend at basal one-third, apex slightly clubbed, with few tubercles with apical setae, with fringe of microtrichia along anterior margin. Median volsella double, dorsal lobe 23–27, 24 µm long, 10–14, 12 µm wide at base, curved, tapering to pointed apex, with microtrichia in basal half, bare and strongly sclerotized in apical half; ventral lobe 20–24, 22 µm long, 6–8, 7 µm wide, with irregularly bilobed apex, strongly fringed with microtrichia. Inferior volsella with anterior lobe barely indicated, median lobe 17– 22, 19 µm long, 22–25, 24 µm wide along posterior margin, with orally curved microtrichia and fringe of strong curved microtrichia. Gonostylus 25–32, 28 µm long; with 26–31, 29 µm long, curved, pointed, apically sclerotized lateral lobe, with long medially directed microtrichia in basal two-third; megaseta 7–11, 9 µm long. HR 4.00–4.73, 4.30. HV 4.35–5.53, 5.06.

Distribution and biology. The species was collected in Malaise traps in fragmented primary Mata Atlântica forests in Paraná and Santa Catarina States at altitudes varying from 100 m up to 900 m a.sl.

Figures

FIGURES 195–200. Pseudosmittia uncata sp. n., male. 195—tentorium, stipes, and cibarial pump; 196—palp; 197— thorax; 198—wing; 199—hypopygium, dorsal aspect; 200—hypopygium with anal point and tergite IX removed, dorsal aspect to the left, ventral aspect to the right.