Tortopus arenales, Molineri, Carlos, 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 : 21-22

Tortopus arenales sp. nov.

Material: holotype male imago from Ecuador: Prov. Esmeralda, Canton Eloy Alfaro, Parroquia Telembí, Estero Arenales , 80 m, 15-IV-2002, S 0º 40' 6" W 78º 59' 25", E. Domínguez col. Paratypes: 13 male and 21 female imagos same data as holotype; 10 male and 26 female imagos same data except Estero Cayapas, 70 m, 15-IV-2002, S 0º 40' 19" W 78º 59' 29", E. Domínguez col.; 11 male and 8 female imagos same data except Estero Calle Mansa, 50 m, 17-IV-2002, S 0º 42' 10" W 78º 58' 01", E. Domínguez col.; and 17 female imagos same data except Estero Charco Vicente, 40 m, 14-IV-2002, S 0º 41' 36" W 78º 54' 33", E. Domínguez col. Holotype, 3 male and 3 female imagos paratypes at MECN; 2 male and 2 female imagos in CUIC and FAMU; remaining material deposited in IML.

Male imago. Length (mm): body, 10.0–11.5; fore wing, 10.0–11.7; hind wing, 4.9–5.2; foreleg, 4.7–5.0; cerci, 26.0–30.0. General coloration yellowish white shaded with brown. Head shaded strongly with brownish gray on a band between ocelli, shading slighter posteriorly forming a profuse anastomosed pattern on occiput ( Fig. 31 ); head not shaded ventrally and before to median ocellus. Antennae: scape and pedicel completely shaded with gray except at apical margin, flagellum hyaline. Thorax. Pronotum ( Fig. 31 ) translucent brownish white shaded widely with brownish gray, anterior ring shaded stronger on submedian zones, paler posteriorly; posterior ring shaded strongly medially with a thin dark medial line and two paler sublateral spots; propleura and presternum translucent brownish white. Mesonotum yellowish white shaded brownish gray along medioparapsidal sutures forming a pair of bands that become darker and converge posteriorly; mesopleura and mesosternum shaded very slightly with gray on pleura, but strongly on basisternum; furcasternal protuberances diverging posteriorly from anterior margin ( Fig. 34 ). Metanotum yellowish white shaded brownish gray widely in anterior zone, stronger shading restricted more medially towards posterior margin; metapleura and sternum brownish white shaded strongly with gray on a pair of submedian anterior marks. Legs. Fore legs shaded completely and strongly with brownish gray except on the very pale claws; middle and hind legs yellowish white slightly shaded gray. Wings. Membrane hyaline shaded brownish gray on C and Sc areas, longitudinal veins shaded brownish, cross veins pale. Abdomen whitish translucent shaded strongly with brownish gray, except on lateral areas. Tergum I shaded submedially, with a translucent medial band; terga II–VII with thin pale median and paramedian dashes, also with a pale oblique dash near lateral margins ( Fig. 32 ); terga VIII–X shaded more widely and strongly except on submedian and lateral pale marks; all terga except the first with a thin dark median line. Abdominal sterna ( Fig. 33 ) shaded strongly on median region except on pale medial line and paired submedial oval marks, shading darker around the medial line; indentations left by nymphal gill muscles (subcircular lateral areas on sterna II–VII) yellowish white shaded gray except on pale medial margin. Genitalia ( Figs. 36–40 ): sternum IX shaded strongly with gray on mediolongitudinal furrow but getting much lighter laterally; pedestals whitish turning yellowish towards apex of parastyli, parastyli relatively short and straight ( Fig. 36–38 ); small first forceps segment whitish, second segment strongly shaded gray; penes whitish, outer margin yellowish, shaded slightly gray on each penial arm. Caudal filaments whitish translucent shaded brownish gray except at joinings.

Female imago. Length (mm): body, 9.6–13.0; fore wing, 11.2–14.5; hind wing, 4.5–6.2; cerci, 3.1–4.0. General coloration as male, eggs yellowish white. Metasternal black marks thinner and longer than in male. Wings darker than in male, membrane slightly tinged with yellow, longitudinal and cross veins shaded with brownish, more strongly on C, Sc and R1 veins; R3 and short intercalary vein before it present on fore wings. Brownish shading on body as in male except slightly paler on abdominal sterna; intersegmental membrane between sterna VII–VIII paler than the rest, sternum VIII with parastyli receptors located submedially ( Figs. 35 , 70–71 ) and strongly shaded gray. Cerci whitish.

Eggs ( Fig. 72 ). Suboval, no attachment structures. Length, 400 µm; width, 330–345 µm. The relatively thick covering of the egg is relatively smooth.

Etymology: from the type locality, Estero Arenales .

Discussion and diagnosis. Tortopus arenales sp. nov. can be separated from all other species of the genus by the following combination of characters: 1) fore wing length 10.0– 11.7 mm (male), 11.2–14.5 mm (female); 2) parastyli with relatively wide base, rest very thin and acute, as long as pedestal ( Fig. 36–37 ); 3) ventral knob well developed ( Fig. 36 ); 4) penes relatively wide at base (fused portion), not strongly expanded distally ( Fig. 36 ); 5) female sockets with oblique opening ( Fig. 35 , 70–71 ); and 6) a relatively dark species, shading on occiput forming a profuse anastomosed pattern ( Fig. 31 ).

Figures

FIGURES 31 – 40. Tortopus arenales. 31, male head, d. v.; 32, male abdominal terga VI – VII; 33, male abdominal sterna VII – VIII; 34, male mesofurcasternal plates; 35, female abdominal sternum VIII; 36, male genitalia, v. v.; 37, same, l. v.; 38, penes after treatment with potash; 39 – 40, detail of apex of forceps.

FIGURES 67 – 72. SEM photographs. Tortopus igaranus: 67, egg, general view; 68, egg, detail of convex side; 69, egg, detail of concave side. Tortopus arenales: 70, female abdominal sternum VIII; 71, same, detail of sockets; 72, eggs.