Askola emmerichi Domínguez, Molineri and Mariano

Domínguez, Eduardo, Grillet, Maria-Eugenia, Nieto, Carolina, Molineri, Carlos & Guerrero, Edmundo, 2014, Ephemeroptera from the Venezuelan Guayanas´s Uplands: Families Leptophlebiidae, Euthyplociidae and Oligoneuriidae, Zootaxa 3827 (3), pp. 301-317 : 302-303

Askola emmerichi Domínguez, Molineri and Mariano

( Figs. 1–3 )

Askola emmerichi Domínguez et al. 2009: 31 ; Nascimento et al. 2011: 200.

Material. Venezuela, Estado Bolívar: 2 female imagos and 1 female subimago from Maremán-Parú stream, 5º44’49’’N – 61º24’’06’’W, 1308 m, 27/VI/2007 ( EG, MEG, AMO cols.). One female imago and one subimago deposited at MLBV, one female imago at IBN .

Discussion. This species was described recently ( Domínguez et al. 2009) from the border of Colombia-Brazil, based only on male imagos. The female imago is described here for the first time, constituting the first record of the species for Venezuela. The female imagos were associated with the male imagos of this species because they present a very similar coloration (except that the blackish markings on the abdomen are somewhat wider). They can be separated from the female imagos of the other species of the genus mainly by the wing and abdominal coloration.

Description. Female imago (in alcohol). Length: body, 6.3–6.5 mm; fore wing, 7.1–7.3 mm. General coloration ( Figs. 1–2 ) thorax yellowish orange, abdomen yellowish with wide V-shaped black markings dorsally. Head ( Fig. 2 ) yellowish with black stripes around lateral and posterior margin of median ocellus and on posterior margin of head. Eyes black. Ocelli whitish, surrounded with black. Antennae yellowish. Thorax. Pronotum and metanotum yellowish white, heavily washed with black. Mesonotum yellowish orange with lateral margins of scutum and central area of scutellum, with the exception of its apex, blackish. Pleurae and sternae yellowish white, except sclerites close to base of legs darker. Legs I and III broken-off and missing. Leg II with segments yellowish white, tarsi and claws broken-off and missing. Wings ( Fig. 2 ). Membrane hyaline, except base of Costal area yellowish and grayish spots around cross veins as in Fig. 2 ; longitudinal veins yellowish, cross veins blackish bordered with grayish; five costal cross veins from bulla to costal brace. Abdomen yellowish white. Terga with variable wide V shaped black markings as in Fig. 1 . Sterna without markings, except egg-guide yellowish orange, and its base grayish ( Fig. 3 ). Caudal filaments yellowish white, with basal 1/6 of each segment blackish.

Female subimago. Length: body, 4.8 mm; fore wing, 6.3 mm. Coloration similar to female imago, except that yellowish and yellowish orange coloration in this specimen is whitish.

Distribution. Brazilian-Colombian border, and Manaus, Brazil, Venezuela (new country record).

Ecology. Imagos of this species were collected along the stream margins, at night, and during the rainy season (June 2007). The specific stream flows through the savanna area (1308 m) and it is a bed-rock, uncovered, medium size stream (30 m wide), with very shallow (~ 30 cm) and acidic (pH = 5) waters.

Figures

FIGURES 1–3. Askola emmerichi, female imago. 1, dorsal view; 2, lateral view; 3, egg guide, ventral view, detail.