Pseudosmittia gibbistyla, 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 : 41-43

Pseudosmittia gibbistyla sp. n.

( Figs 112–118 )

Type material. Holotype male, BRAZIL: Santa Catarina State, Urubici, Morro da Igreja , cloud forest, 1.822 m a.s.l., 18.v.2005, L.E.M. Bizzo & L.C. Pinho ( MZUSP).

Diagnostic characters. The species differ from P. umbonata by having apically bifid median volsella, inferior volsella with digitiform projection, no anal point and a wing length of about 1.2 mm.

Etymology. From Latin, gibbus, hump-backed and Greek, stylos, column, referring to the secondary lobe of the gonostylus.

Male (n = 1). Total length not measurable. Wing length 1.23 mm. Wing length / length of profemur 3.35.

Coloration. Fully brown.

Head. AR 1.05. Ultimate flagellomere 368 µm long. Temporal setae apparently 4, consisting of 2 inner verticals and 2 outer verticals. Clypeus with 9 setae. Tentorium, stipes and cibarial pump as in Figure 112 . Tentorium 109 µm long, 26 µm wide. Stipes 105 µm long, 26 µm wide. Palpomere ( Fig. 113 ) lengths (in µm): 26, 38, 86, 83, 109. Third palpomere with 3 lanceolate sensilla clavata, longest 15 µm long.

Thorax ( Fig. 114 ). Median antepronotal lobes reduced; antepronotum with 1 lateral seta. Dorsocentrals 13, acrostichals 2, prealars 5, supraalar absent. Scutellum with 6 setae.

Wing ( Fig. 115 ). VR 1.49. Anal lobe indicated. No costal extension. R 4+5 ending above apex of Cu 1; Cu 1 weakly sinuate. Brachiolum with 1 seta, R with 3 setae, other veins bare.

Legs. Spur of fore tibia 38 µm long, spurs of mid tibia 23 µm and 15 µm long, of hind tibia 41 µm and 23 µm long. Width at apex of fore tibia 23 µm, of mid tibia 26 µm, of hind tibia 34 µm. Comb of 12 setae, longest 30 µm long, shortest 19 µm long. Length and proportions of legs as in Table 12.

Hypopygium ( Figs 116–118 ). Anal point lacking. Tergite IX with 16 setae. Laterosternite IX with 6 setae.

Phallapodeme 83 µm long, apodeme lobe with 3–4 indistinct wrinkles. Sternapodeme evenly rounded with no trace of oral projections, arched part about 52 µm long. Virga triangular, 19 µm long. Gonocoxite 145 µm long. Superior volsella 36 µm long, tapering, weakly curved anteriomedially, with anterior fringe of microtrichia in apical half, with 3 small tubercles with apical setae at base and 2 tubercles along posterior margin. Median volsella double, both lobes subtriangular with fringe of long microtrichia, dorsal lobe 26 µm long, ventral lobe 33 µm long. Inferior volsella with digitiform anterior lobe, 33 µm long, 26 µm wide at base, with 2 weak dorsal setae; with large, rounded median lobe with numerous orally curved microtrichia. Gonostylus 58 µm long; with triangular 38 µm long, 28 µm wide lateral lobe partly fused with gonostylus, covered with curved microtrichia; megaseta 9 µm long. HR 2.49.

Distribution and biology. The single specimen was collected at an altitude of about 1.800 m a.s.l. in a fragmented primary cloud forest belonging to the Mata Atlântica forest in Santa Catarina State, Brazil. The specimen was taken in a Malaise trap close to a small stream.

Figures

FIGURES 112–118. Pseudosmittia gibbistyla sp. n., male. 112—tentorium, stipes, and cibarial pump; 113—palp; 114— thorax; 115—wing; 116—hypopygium, dorsal aspect; 117—hypopygium with anal point and tergite IX removed, dorsal aspect to the left, ventral aspect to the right; 118—superior volsella, dorsal view.