Tortopsis obscuripennis (Domínguez) Dominguez, 2010

Molineri, Carlos, 2010, A cladistic revision of Tor top us Needham & Murphy with description of the new genus Tortopsis (Ephemeroptera: Polymitarcyidae), Zootaxa 2481, pp. 1-36 : 25

Tortopsis obscuripennis (Domínguez) New combination

Tortopus obscuripennis Domínguez 1985: 71 ; Molineri 2008: 10.

Material ( IML): holotype and 18 paratypes female imagos from Argentina: Salta, Aguas Blancas, Estancia El Arrayazal, 9-XII-1981, Domínguez col. Other material from Argentina and Bolivia listed in Molineri (2008).

Female imago. Head black between ocelli, with gray anastomosed marks on occiput (some times very slightly marked). Pronotum with anterior ring widely shaded black, and posterior ring shaded grayish black on central area, lateral to this shading there is an isolated narrow gray mark, and also shaded near anterolateral corner. Wings with very dark veins; vein R3 and short intercalary before it absent in fore wings but some females present a weak vein in zig-zag formed by coalescence of cross veins, with a length of 2 cells. Abdominal terga with thin black medial line, surrounded by a paler grayish band, and more laterally with wide submedian dark bands. Sternum VIII with relatively small C-shaped sockets, with indistinct margin (not sclerotized or pigmented), depression subcircular ( Fig. 48 ).

Egg. Suboval, no attachment structures. Length, 390–410 µm; width, 340–350. The chorionic cover is sculptured with a hexagonal pattern.

Discussion and diagnosis. This species, originally described from female adults ( Domínguez 1985) is currently known from all the stages ( Molineri 2008) and has been recorded from Argentina and Bolivia. Tortopus obscuripennis can be separated from all other species of the genus by: 1) fore wing length 15.0 mm (male), 19.5–20.5 mm (female); 2) relatively dark wings (membrane translucent), all veins shaded gray; 3) parastyli long and moderately curved; 4) penes abruptly widening in distal half; 5) female parastylus receptors C–shaped ( Fig. 48 ); 6) head shaded black among ocelli, occiput with a finely reticulated grayish pattern; 7) female pronotum with anterior ring widely shaded black, and posterior ring shaded grayish black on central area, lateral to this shading there is an isolated narrow gray mark, and also shaded near anterolateral corner.

Figures

FIGURES 44 – 52. Tortopsis, female imago. 44, T. obscuripennis, fore wing. T. sarae: 45, mesofurcasternum; 46, abdominal sternum VIII, v. v.; 47, same, l. v. T. obscuripennis: 48, abdominal sternum VIII, l. v. T. primus: 49, abdominal sternum VIII, l. v. T. puella: 50, abdominal sternum VIII, v. v.; 51 – 52, same, l. v.