Tortopsis primus (McDunnough) McDunnough, 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 : 26-27

Tortopsis primus (McDunnough) New combination

Campsurus manitobensis Ide, 1941 (syn.)

Campsurus primus McDunnough, 1924 (orig.) Tortopus manitobensis ( Ide), 1941 (syn.)

Material ( FAMU): 2 female adults from USA, Iowa: Cherokee Co., Cherokee, 28-VIII-1953, H. H. Ross col.; and 3 female adults from Illinois, Urbana, 16-VIII-1956, at light, J. Kingsolver col.

Female adult. Length (mm): body, 15.0–16.0; fore wing, 15.0–16.0; hind wing, 7.0; cerci, 5.5. General coloration whitish yellow, pigments very faded (one of the females show some light gray markings described below). Head: with a mediolongitudinal gray line from median ocellus to a transversal V-shaped line between lateral ocelli, remainder completely faded. Thorax: pronotum yellowish with anterior ring shaded gray, and posterior ring shaded with light gray but pattern not distinguishable. Wings: membrane yellowish white, veins yellowish except those near costa shaded gray. Abdomen: shaded gray dorsally, terga with wide median band darker than the rest, except on tergum I–II paler medially, and thin medial blackish line on terga I–VIII. Sternum VIII with large sockets, the sclerotized margin of the socket reaches the anterior margin of the sternum; anterior and posterior margins of socket diverging each other toward medial line; anterior margin slightly sinuous; the depression delimited by the socket is elongated.

Egg. Suboval, no attachment structures. Length, 390–410 µm; width, 310–330 µm.

Discussion and diagnosis. This species is known from adults of both sexes but no formal description of female was found. Here a short description of the female adult is provided based on the scarce material available. This species is widely distributed in Mexico, USA and Canada ( Randolph & McCafferty 2002). Tortopsis primus can be separated from all other species of the genus by: 1) fore wing length 12 mm (male), 15.0–16.0 mm (female); 2) wings slightly tinted yellowish white, veins yellowish; 3) parastyli long and moderately curved; 4) penes cylindrical, slender; 5) female parastylus receptors large and with divergent anterior and posterior margins of socket; 6) color pattern very faded, apparently a very pale species.