Rheochlus prolongatus Brundin, 1966

Siri, Augusto, Brodin, Yngve, Ilpla, Conicet-Cct & Unlp, 2014, Cladistic analysis of Rheochlus and related genera, with description of a new species (Diptera: Chironomidae: Podonominae), Acta Entomologica Musei Nationalis Pragae 54 (1), pp. 361-375 : 368-369

Rheochlus prolongatus Brundin, 1966

( Fig. 15 )

Type material examined. HOLOTYPE: adult J, “ ARGENTINA / Santa Cruz province / Río Gallegos / 28.iii.58 / Besch W. col.” ( SMNH).

Redescription. Male imago (n = 1, holotype) ( Fig. 15 ). Total length 1.79 mm, total length /wing length 1.10.

Head. Eyes hairy. Antenna with 14 flagellomeres. AR 0.60. Temporal, postorbital and clypeal setae could not be counted. Palpomere length not measurable.

Thorax. Setae could not be counted.

Wing ( Fig. 15 ): length 1.63 mm; width 0.60 mm; L/ W 2.71. VR 0.98. Width of cell r 1 at the end of vein R 1 120 ; maximum width of cell r 5 165; r 1 /r 5 0.73. Brachiolars could not be counted; squama with 7 setae. R with 7 setae, R 1 with 6 setae, R 4 +5 with 6 setae. Remaining veins bare .

Legs. Spur of front tibia 40 long; one spur of mid tibia 33, the other one not observed; of hind tibia 75 and 30 long. Apex of ti 1 40 wide; of ti 3 63 wide. Comb with 15 spines. Lengths and proportions of legs in Table 3.

Hypopygium (see Fig. 357 in BRUNDIN 1966). Setae on tergite and laterosternite IX could not be counted. Transverse sternapodeme 80 long. Gonocoxite 150 long; dorsal basal keel 0.58 as long as gonocoxite. Gonostylus 85 long; apical lobe 37 long, apical seta (“t” seta) 14 long; subapical lobe 21 long, apical seta (“t” seta) 12 long. Seta “p” 65 long, 3 wide, L/W of seta “p” 21.7. The “y” seta situated in the apical third, the “x” seta at mid-length of outer margin. HR 1.76, HV 1.19.

Distribution. Argentina (Santa Cruz province: Rio Gallegos).

Figures

Figs 10–19. Rheochlus species adults. 10–12 – R. insignis Brundin, 1966, male: 10 – antenna; 11 – wing; 12 – hypopygium, dorsal view (right) and ventral view (left). 13–14 – R. insignis Brundin, 1966, female: 13 – antenna; 14 – wing. 15 – R. prolongatus Brundin, 1966, male wing. 16–19 – R. wirthi (Freeman, 1961): 16–17 – male (16 – antenna, 17 – wing); 18–19 – female (18 – antenna, 19 – wing). Scale bars = 100 ȝm.