Tortopus harrisi Traver

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 : 20-21

Tortopus harrisi Traver

T. harrisi Traver 1950: 604 ; Domínguez 1985: 69.

Type material ( CUIC): holotype male imago, 2 slides No. 3031, one slide with a pair of wings, the other with the genitalia, labeled: “ Tortopus / harrisi -/ Holotype /3 im..Wings/corumba, Mat. Grosso,/ Brazil /14/ 23-XII-19 / R G Harris” and “ Tortopus / harrisi / Holotype /3 im.- Genitalia/Corumba, Mat. Grosso,/ Brazil /14/ 23-XII-19 / spec pinned/R G Harris”.

Other material ( IML): 15 (pinned) female imagos from Paraguay, Depto. San Pedro, Carumbé, 28/I to 10/ III -1965, R. Golbach col. Three of these specimens were re-hydrated in water prior to study, and then preserved in alcohol.

Female imago. Length (mm): body, 10.0–13.0; fore wing, 10.5–15.0; hind wing, 4.5–6.2; cerci shrunken. General coloration yellowish light brown, eggs yellowish orange. Head shaded with black between lateral ocelli and with a lighter grayish pattern on occiput. Antennae shaded slightly with gray. Thorax. Pronotum shaded with black on anterior and posterior margins, large zone on median area shaded gray. Meso- and metanotum shaded black on carinae and posteromedian triangular marks. Legs yellowish. Wings. Membrane hyaline, veins purplish light brown, darker on C, Sc and R1 veins; R3 and short intercalary vein before it present on fore wings. Abdomen shaded gray dorsally, ventrally pale; terga with thin medial black line; a relatively wide zone forming a medial band is shaded gray on terga I–VII, terga VIII–IX shaded almost completely except two pairs of long pale dashes; pale sublateral areas present at least on terga II–VI. Sternum VIII with small submedian sockets and long anterior furrows ( Fig. 23 ).

Nymph. Described in Molineri et al. (2010).

Eggs. Suboval, no attachment structures. Length, 360–380 µm; width, 270–310 µm. The chorion is almost completely sculptured with a hexagonal pattern.

Discussion and diagnosis. Tortopus harrisi is known from the male holotype and some females here attributed to this species. This species can be distinguished from all other species of the genus by: 1) male fore wing length 10.5 mm ( Traver 1950 reported 9.0 mm for the same specimen), female fore wing 10.5–15.0 mm; 2) parastyli very short and pointed ( Fig. 19, 22 ); 3) ventral knob relatively large ( Fig. 22 ); and 4) penes relatively narrow basally, not expanded ( Fig. 19 ), sclerotized margin narrowly ending ( Figs. 20–21 ). The female imagos described here are only tentatively associated to this species, based on general size and coloration. These females are from Carumbé ( San Pedro, Paraguay), a locality on the Paraguay River relatively close to the type locality Corumbá (Mato Grosso, Brazil), some kilometres above the same river.

Figures

FIGURES 19 – 23. Tortopus harrisi, male holotype: 19, genitalia, v. v. (pa = penial arm); 20 – 21, details of apex of penes; 22, detail of pedestal and base of forceps, v. v. (k = knob, pd = pedestal, ps = parastylus); 23, female sternum VIII.