Tortopsis limoncocha, 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 : 32

Tortopsis limoncocha sp. nov.

Material: holotype male imago from Ecuador: Limon Cocha, río Jivino, 250 m, 6-VI-1984, E. Domínguez col.; allotype female imago, and 36 male and 2 female imagos paratypes same data as holotype; 1 male paratype from Ecuador: Coca, 4-IV-1984, E. Domínguez col. All the material in IML except holotype and 3 male paratypes at MECN, 1 male paratype at CUIC and 1 male paratype at FAMU.

Male imago. Length (mm): body, 11.0–11.8; fore wings, 10.5–12.5; hind wing, 4.8–6.0, fore leg, 4.8–5.5; cerci, 28.0–30.0. General coloration yellowish white. Head whitish shaded gray strongly between ocelli, shaded lighter on occiput except pale median area ( Fig. 53 ). Antennae: scape and pedicel whitish shaded gray, flagellum hyaline. Thorax. Anterior ring of pronotum hyaline shaded widely with gray posteriorly, a whitish tranversal line separate it from the posterior ring; posterior ring hyaline becoming whitish laterally, widely shaded gray; hind margin shaded black on a transversal thin line ( Fig. 53 ); propleura and sternum yellowish white. Mesonotum yellowish white shaded gray except on posteromedian membranous area, shaded stronger on carinae and V-shaped mark between posterior scutal protuberances; mesopleura and sternum yellowish white shaded slightly gray on basisternum (in some males, not shaded) and margin of sclerites; furcasternal protuberances with medial margins parallel anteriorly ( Fig. 54 ). Metanotum yellowish white shaded gray medially, pleura and sternum paler, shaded gray medially on sternum. Legs yellowish white shaded gray on fore leg, stronger on tibiae and tarsomeres 1–4, claws pale. Wings membrane hyaline, longitudinal veins whitish translucent shaded gray, stronger on veins Sc and R1, cross veins pale. Abdomen whitish translucent with a thin medial black line in all terga except I and X; tergum I shaded gray laterally, terga II–VII shaded gray almost completely except on submedial elongated pale marks; terga VIII–X shaded more strongly except submedial and sublateral pale marks on terga VIII–IX. Abdominal sterna shaded gray uniformly (some males not shaded at all) except medial line and paramedian posterior spots, pale; sterna shaded strongly on indentations of nymphal gill muscles; sternum VIII with sublateral blackish longitudinal lines. Genitalia ( Figs. 57–59 , 73–74 ): sternum IX completely shaded gray; parastyli yellowish, long and curved at the apex ( Fig. 58 , 73 ); forceps and penes whitish translucent shaded light gray on penes, penes divided from the base with strongly sclerotized and distal hook ( Fig. 59 , 74 ). Caudal filaments whitish translucent.

Female imago. Length (mm): body, 13.0–15.0; fore wings, 14.0–16.0; hind wing, 6.0–6.5; cerci, 5.0. Similar to male except wing membrane slightly yellowish and longitudinal and cross veins shaded stronger with gray; vein R3 and short intercalary before it absent. Pronotum without well marked sublateral gray lines, mesosternum with relatively narrow basisternum. Abdominal terga with a pattern similar to males except on terga VIII–IX shaded more widely; the wide median band as dark as the rest. Sternum VIII with lateral Cshaped parastyli receptors ( Figs. 55–56 , 75 ), shaded gray on inner margins, depression somewhat elongated.

Eggs. Suboval, one of the sides slightly more pronounced than others, no attachment structures. Length, 385–400 µm; width, 330 µm. Chorion slightly sculptured with hexagonal plates almost entirely, and with shallow grooves on the concave area near the more pronounced pole ( Fig. 76 ).

Etymology: from the type locality, Limon Cocha.

Discussion and diagnosis. Tortopsis limoncha sp. nov. can be distinguished by: 1) fore wing length 10.5– 12.5 mm (male), 14.0–16.0 mm (female); 2) wings whitish translucent, darker on costal margin and veins; 3) parastyli relatively straight, curved apically ( Fig. 58 ); 4) penes cylindrical ( Fig. 57 ); 5) parastylus receptors Cshaped ( Figs. 55–56 , 75 ); 6) head shaded black behind median ocellus, shaded gray on occiput except pale median area; 7) pronotum shaded rather similar to Tortopsis obscuripennis and Tortopsis sarae but the sublateral isolated gray marks on posterior ring of female pronotum are thinner.

Figures

FIGURES 53 – 59. Tortopsis limoncocha. 53, male head, v. v.; 54, male mesofurcasternal plate; 55, female abdominal sternum VIII, l. v.; 56, same, v. v.; 57, male genitalia, v. v.; 58, same, l. v.; 59, detail of apex of penes.

FIGURES 73 – 80. SEM photographs. Tortopsis limoncocha: 73, male genitalia, v. v.; 74, apex of penes, detail; 75, female abdominal sternum VIII, detail of left socket; 76, egg. Tortopsis spatula: 77, male genitalia, v. v. and detail of apex of penes; 78, female abdominal sternum VIII, detail of left socket; 79, egg; 80, egg, thread partially uncoiled.