Pseudosmittia adunca, 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 : 26-28

Pseudosmittia adunca sp. n.

( Figs 62–67 )

Type material. Holotype male, BRAZIL: Santa Catarina State, Jaraguá do Sul , 14.v.–02.viii.2003, emergence trap (soil), A.P. Dias et al. ( MZUSP) . Paratype: 1 male, 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. ( ZMBN) .

Diagnostic characters. The male can be separated from other species with bifurcate gonostylus by the long, curved, tapering lobe of the gonostylus and the long, bare, dorsal lobe of the median volsella.

Etymology. From Latin, aduncus, bent inward, hooked, referring to the lobe on the gonostylus.

Male (n = 1–2). Total length 1.83 mm. Wing length 0.94–1.02 mm. Total length / wing length 1.79. Wing length / length of profemur 3.34–3.41.

Coloration. Fully brown.

Head. AR 0.84–0.98. Ultimate flagellomere 278–326 µm long. Temporal setae 6–8, consisting of 3–4 weak inner verticals, 2–3 strong outer verticals and 1 postorbital. Clypeus with 6–10 setae. Tentorium, stipes and cibarial pump as in Figure 62 . Tentorium 79–94 µm long, 23 µm wide. Stipes 83–86 µm long, 30–38 µm wide. Palpomere ( Fig. 63 ) lengths (in µm): 15–22, 26–40, 60–97, 108, 108. Third palpomere with 3–4 lanceolate sensilla clavata, 14–15 µm long.

Thorax ( Fig. 64 ). Median antepronotal lobes reduced; antepronotum with 1 lateral seta. Dorsocentrals 7– 9, acrostichals 2, prealars 4, supraalar absent. Scutellum with 6 setae.

Wing ( Fig. 65 ). VR 1.40. Anal lobe weak. Costal extension 11–16 µm long. R 4+5 ending distinctly proximal apex of M 3+4; Cu 1 curved. Brachiolum with 1 seta, other veins bare.

Legs. Spur of fore tibia 38–45 µm long, spurs of mid tibia 25 µm and 11 µm long, of hind tibia 34–38 µm and 14–15 µm long. Width at apex of fore- and mid tibia 18–20 µm, of hind tibia 25–26 µm. Comb of 10–12 setae, longest 34 µm long, shortest 14 µm long. Length and proportions of legs as in Table 8.

Hypopygium ( Figs 66–67 ). Anal point 7 µm long. Tergite IX with 16–17 setae. Laterosternite IX with 3–4 setae. Phallapodeme 69–75 µm long. Sternapodeme evenly rounded with no trace of oral projections, arched part about 39–48 µm long. Virga narrowly triangular, 14–20 µm long. Gonocoxite 121–136 µm long. Superior volsella 31–45 µm long, clubbed, with apical microtrichia and small tubercles with apical seta ventrally at base. Median volsella double; dorsal lobe strongly sclerotized, slender, curved, projecting anteriomedially, 33–45 µm long, bare; ventral lobe subtriangular, widest near apex, projecting posteriomedially, 28–30 µm long, fringed with strong microtrichia. Inferior volsella with hump-like, 9–11 µm high anterior lobe; median lobe 26–30 µm long, adpressed to gonostlylus, with fringe of strong curved microtrichia in apical one-third. Gonostylus 26–27 µm long; basally with additional 43 µm long, curved lobe, tapering to strongly sclerotized apex; megaseta 7–11 µm long. HR 4.64–5.00. HV 6.78.

Distribution and biology. The species is known from two localities in northeastern Santa Catarina State in Brazil were it was collected at altitudes varying from sea level to above 600 m a.s.l. In Jaraguá do Sul it was taken in an emergence trap in a banana plantation; in São Bento do Sul it was collected in a Malaise trap in an area with fragmented Mata Atlântica forest.

Figures

FIGURES 62–67. Pseudosmittia adunca sp. n., male. 62—tentorium, stipes, and cibarial pump; 63—palp; 64—thorax; 65—wing; 66—hypopygium, dorsal aspect; 67—hypopygium with anal point and tergite IX removed, dorsal aspect to the left, ventral aspect to the right.