Callibaetis jaffueli Navás 1918 revalidated species

(Figs. 6 A–6E)

Callibaetis jaffueli Navás 1918: 214; Gillies 1990: 25; Domínguez et al. 2006: 115 (previously syn. with C. jocosus by Gillies 1990)

Known stages. I ♂.

Diagnosis. Male imago: 1) forewing with pigmentation overlapping R 1 in five regions, overlapping radial sector medially, without forming complete bands (Fig. 6 B); 2) marginal intercalary veins paired (Fig. 6 B); 3) hind wing with small brown mark at middle (Fig. 6 C); 4) hind wing with pointed costal process (Fig. 6 C); 5) marginal intercalary veins on hind wing present (Fig. 6 C); 6) abdominal terga brown, with few spots and dark longitudinal mark at middle (Fig. 6 E); 7) abdominal terga III, V and VI without lateral inverted V mark; 8) abdominal sterna covered with spots (Fig. 6 D); 9) abdominal sterna with strong pigmented medioanterior and medioposterior sigilla (Fig. 6 D).

Redescription. Male imago. Length: body, 6.5 mm; forewing, 7 mm; cerci 8.6 mm. Head. Compound eyes with brown turbinate portion. Antenna with brown scape, pedicel and flagellum. Thorax. Anteronotal protuberance brown medially; posterior scutal protuberance and scutellum brown. Anteronotal and metascutellar protuberance rounded. Legs: Tibia I with brown marks apically. Wings. Forewing with pigmented C and Sc areas, overlapping R 1 in five regions, third region overlapping Radial sector (Fig. 6 B); veins light brown; marginal intercalary veins paired; length of each intercalary vein 0.7 × distance between adjacent longitudinal veins; length of forewing about 2.6 × width. Hind wing with small brown mark at middle (Fig. 6 C); costal process pointed; three marginal intercalary veins. Abdomen. Terga. Brown, with some spots and dark longitudinal mark in middle (Fig. 6 E); terga III, V and VI without lateral inverted V mark. Sterna. Light brown, covered with spots and with well pigmented medioanterior and medioposterior sigilla (Fig. 6 D). Genitalia. Forceps light brown and badly damaged.

Comments. Callibaetis jaffueli revalidated species can be differentiated from C. (C.) jocosus, C. (C.) zonalis, C. (C.) willineri and C. (C.) guttatus by the abdominal sterna medially, on anterior margin, without one large spot (in contrast to C. (C.) willineri); marginal intercalary veins on hind wing present (in contrast to C. (C.) zonalis); terga III, V and VI without lateral inverted V mark (Fig. 6 E) (in contrast to C. (C.) guttatus and C. (C.) jocosus); and the forewing with pigmentation overlapping R 1 in five regions, overlapping radial sector medially, without forming complete bands (Fig. 6 B) (in contrast to C. (C.) jocosus).

Based on the re-evaluation of the morphological evidence, we propose the revalidation of Callibaetis jaffueli revalidated species Navás and designate the unique known specimen as lectotype.

Material examined. Callibaetis jaffueli, male imago (lectotype by present designation, dry), CHILE, Los Perales, Marga-Marga, i.1918, P. Jaffuel coll., MZB.

Distribution. Chile: Marga-Marga.