Pseudosmittia carioca, 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 : 34-36

Pseudosmittia carioca sp. n.

( Figs 88–93 )

Type material. Holotype male, BRAZIL: Rio de Janeiro State, Reserva Biológica Tinguá, Nova Iguaçu , 22º34'28''S, 43º26'09''W, 5–8.iii.2002, Malaise trap (Trilha 5), S.T.P. Amarante et al. (BRTIN11: BIOTA- FAPESP) ( MZUSP) . Paratypes: 2 males, as holotype ( ZMBN) ; 1 male, as holotype except 22º34'32''S, 43º26'07.6''W, 8–11.iii.2002, Malaise trap (Bosque 3), (BRTIN18: BIOTA-FAPESP) ( ZMBN) .

Diagnostic characters. The male imago can be separated from other Neotropical species of the genus by the combination of R 4+5 ending proximal to Cu 1, virga without lateral lamellae and composed of two spines longer than half the length of the phallapodeme.

Etymology. From Portuguese, carioca , meaning native from Rio de Janeiro and referring to where the material was collected. The name is to be treated as a noun in apposition.

Male (n = 3–4, except when otherwise stated). Total length 1.09 (1) mm. Wing length 0.63–0.70, 0.66 mm. Total length / wing length 1.73 (1). Wing length / length of profemur 2.92–3.09.

Coloration. Thorax and abdomen brown, legs pale brown.

Head. AR 0.63–0.84, 0.72; ultimate flagellomere 166–212, 187 µm long. Temporal setae 2–5, 4; including 1–2, 1 inner vertical and 1–3, 2 outer verticals. Clypeus with 6 setae. Tentorium, stipes and cibarial pump as in Figure 88 . Tentorium 63–75, 68 µm long; 9–11, 10 µm wide. Stipes 50 (1) µm long. Palpomere ( Fig. 89 ) lengths (in µm): 9–11, 10; 15–18, 16; 24–27, 25; 20–30, 25; 26–45, 33. Third palpomere with 2–5 lanceolate sensilla clavata, longest 10–15 µm long.

Thorax ( Fig. 90 ). Median antepronotal lobes reduced; antepronotum with 2 lateral seta. Dorsocentrals 5– 6, 5; acrostichals 2; prealars 2; supraalar absent. Scutellum with 2 setae.

Wing ( Fig. 91 ). Wing cuneiform. Cu 1 curved. R 4+5 ending far proximal to apex of Cu 1. VR 1.68–1.81, 1.74. Costa not extended. Brachiolum with 1 seta, other veins bare.

Legs. Spur of fore tibia 24–27 (2) µm long; spurs of mid tibia 11–18 µm and 9 µm long; of hind tibia 25– 29 µm and 11 µm long. Width at apex of fore tibia 14 µm; of mid tibia 14–16, 15 µm; of hind tibia 23 µm. Comb with 11–12 setae, longest 20–27 µm long, shortest 14–18 µm long. Length and proportions of legs as in Table 11.

Hypopygium ( Figs 92–93 ). Anal point triangular, 16 µm long, 9–11 µm wide at base, with 10–18 setae, no additional setae on tergite IX. Laterosternite IX with 2–3, 2 setae. Phallapodeme 50–52 µm long. Sternapodeme evenly rounded with no trace of oral projections; arched part about 45–52 µm long. Virga 34–45, 39 µm long, apparently without lateral lamellae. Gonocoxite 88–98, 94 µm long. Superior volsella barely indicated. Inferior volsella broadly rounded, 14–17 µm wide, reaching to 0.64–0.72 gonocoxite length. Gonostylus 44– 50, 46 µm long, curved with large, rounded apical crista dorsalis; megaseta 4–6 µm long. HR 1.95–2.15, 2.02. HV 2.34 (1).

Distribution and biology. The species is known only from Reserva Biológica Tinguá in the outskirts of Rio de Janeiro city, Brazil. This nature reserve is a mosaic of primary and secondary Mata Atlântica forest.

Figures

FIGURES 88–93. Pseudosmittia carioca sp. n., male. 88—tentorium, stipes, and cibarial pump; 89—palp; 90—thorax; 91—wing; 92—hypopygium, dorsal aspect; 93—hypopygium with anal point and tergite IX removed, dorsal aspect to the left, ventral aspect to the right.