Callibaetis Eaton, 1881

Cruz, Paulo Vilela, Salles, Frederico Falcão & Hamada, Neusa, 2013, Callibaetis Eaton (Ephemeroptera: Baetidae) from Brazil, Journal of Natural History (J. Nat. Hist.) 48 (11 - 12), pp. 591-660 : 593

Callibaetis Eaton

Callibaetis Eaton, 1881 ; Gillies, 1990, p. 15.

(Type-species: Callibaetis pictus Eaton , original designation).

Diagnosis

Male imago. (1) Body usually with small red spots; (2) dorsal portion of turbinate eyes oval or circular, not touching each other; (3) forewing hyaline, sometimes pigmented; (4) marginal intercalary veins single or paired; (5) hind wing with three longitudinal veins; (6) costal process of hind wing located on basal third; (7) forceps segment II narrow medially ( Domínguez et al. 2006, adapted).

Female imago. (1) Body usually with small red spots; (2) forewing usually pigmented; (3) marginal intercalary veins single or paired; (4) hind wing with three longitudinal veins; (5) costal process of hind wing located on basal third ( Domínguez et al. 2006, adapted).

Mature nymph. (1) Head without frontal keel; (2) anterior margin of labrum with small or deep medial emargination; (3) mandibles with incisors deeply cleft; (4) inner set of incisors at oblique angle with outer set; (5) mandibles always with tuft of setae between prostheca and mola; (6) lingua with rounded projection apically, longer than superlingua; (7) maxillary palp with two segments; (8) second segment of labial palp without distomedial projection; (9) third segment of labial palp concave; (10) hind wing pads present; (11) tibio-patellar suture present in all legs; (12) tarsal claws of foreleg with two rows of long denticles; (13) small spines present at the rear margins of abdominal terga II to X; (14) gills on abdominal segments I to VII; (15) gills, at least on segments I to VI with folds; (16) posterior margin of paraprocts with spines; (17) terminal filament shorter than cerci; (18) body without scales or base of scales ( Domínguez et al. 2006, adapted).