Pseudosmittia umbonata, 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 : 67-69

Pseudosmittia umbonata sp. n.

( Figs 188–194 )

Type material. Holotype male, BRAZIL: São Paulo State, Estação Ecológica Juréia-Itatins, Peruíbe , 24º31'06''S, 47º12'06''W, 3.v.2002, Malaise trap (Bosque 6), N.W. Perioto et al. (PEJU03: BIOTA-FAPESP) ( MZUSP) . Paratypes: 3 males, as holotype except 6.v.2002, Malaise trap (Trilha 1), (PEJU11: BIOTA- FAPESP)( ZMBN) ; 1 male, as holotype except (PEJU17: BIOTA-FAPESP) ( MZUSP) .

Diagnostic characters. The species differ from P. gibbistyla by having a simple median volsella, inferior volsella with low, rounded anterior lobe, short anal point and a wing length of about 0.9 mm.

Etymology. From Latin, umbo, knob, shield and - atus, equipped with, referring to the shape of the anterior lobe of inferior volsella.

Male (n = 3–5, except when otherwise stated). Total length 1.29–1.53, 1.42 mm. Wing length 0.80–0.93, 0.87 mm. Total length / wing length 1.56–1.66, 1.60. Wing length / length of profemur 3.16–3.48.

Coloration. Fully brown.

Head. AR 0.84–1.03, 0.95. Ultimate flagellomere 241–281, 262 µm long. Temporal setae 6–7, 6; consisting of 3–4, 4 weak inner verticals and 2–3, 3 stronger outer verticals. Clypeus with 8–11, 9 setae. Tentorium, stipes and cibarial pump as in Figure 188 . Tentorium 75–95, 86 µm long; 14–16, 15 µm wide. Stipes 78–82, 80 µm long. Palpomere ( Fig. 189 ) lengths (in µm): 11–15, 13; 20–27, 24; 50–57, 53; 64–68, 65; fifth palpomere lost. Third palpomere with 2–3, 2 lanceolate sensilla clavata; longest 9–15, 12 µm long.

Thorax ( Fig. 190 ). Median antepronotal lobes reduced; antepronotum with 1–2, 1 lateral seta. Dorsocentrals 8–11, 9; acrostichals 2; prealars 3–4, 3; supraalar absent. Scutellum with 5–6, 6 setae.

Wing ( Fig. 191 ). VR 1.53–1.59, 1.56. VR 1 1.41 (1). Anal lobe weak. Costal extension 0–34 µm long. R 4+5 ending slightly distal to apex of Cu 1. Cu 1 weakly sinuous. Brachiolum with 1 seta, other veins bare.

Legs. Spur of fore tibia 25–41, 33 µm long; spurs of mid tibia 18 (1) µm and 14 (1) µm long; of hind tibia 36–41, 38 µm and 18–20, 19 µm long. Width at apex of fore tibia 17–19, 18 µm; of mid tibia 23 µm; of hind tibia 26–29, 27 µm. Comb of 11–12, 11 setae; longest 25–30, 27 µm long; shortest 15–19, 17 µm long. Length and proportions of legs as in Table 25.

Hypopygium ( Figs 192–194 ). Anal point indicated. Tergite IX with 10–22, 16 setae. Laterosternite IX with 4–6, 5 setae. Phallapodeme 59–77, 71 µm long. Sternapodeme evenly rounded with no trace of oral projections, arched part about 45–52, 49 µm long. Virga triangular, 16–23, 20 µm long. Gonocoxite 95–127, 113 µm long. Superior volsella digitiform, 28–31, 30 µm long, 6–8, 7 µm wide at base, with few tubercles with apical setae, with anterior fringe of microtrichia. Median volsella simple, subtriangular, 22–28, 24 µm long, 7–8, 8 µm wide at base, with microtrichia and anterior fringe. Inferior volsella 12–15, 14 µm long, 19–26, 22 µm wide, with rounded anterior lobe, with few dorsal setae; median lobe rounded to subquadrangular, 25–30, 28 µm long, with numerous orally curved microtrichia. Gonostylus 25–31, 27 µm long, tapering to apex; with about 21 µm long, 19 µm high lateral lobe partly fused with gonostylus, with medially directed microtrichia; megaseta 9–11, 10 µm long. HR 3.85–4.61, 4.18. HV 5.11–5.86, 5.37

Distribution and biology. The species was collected in Malaise traps in a lowland primary Mata Atlântica forest in São Paulo State, Brazil.

Figures

FIGURES 188–194. Pseudosmittia umbonata sp. n., male. 188—tentorium, stipes, and cibarial pump; 189—palpomere 1—4; 190—thorax; 191—wing; 192—hypopygium, dorsal aspect; 193—hypopygium with anal point and tergite IX removed, dorsal aspect to the left, ventral aspect to the right; 194—superior volsella, dorsal view.