Callibaetis Eaton (Ephemeroptera: Baetidae) from Brazil Author Cruz, Paulo Vilela Programa de Pós-graduação em Entomologia, Instituto Nacional de Pesquisas da Amazônia (INPA), CEP 69060 - 001, Manaus, Amazonas, Brazil; Author Salles, Frederico Falcão Universidade Federal do Espírito Santo, CEP 29933 - 415 São Mateus, Espírito Santo, Brazil; Author Hamada, Neusa Coordenação de Pesquisas em Entomologia (CPEN), Instituto Nacional de Pesquisas da Amazônia (INPA), CEP 69060 - 001, Manaus, Amazonas, Brazil text Journal of Natural History 2013 J. Nat. Hist. 2014-01-20 48 11 - 12 591 660 https://www.mendeley.com/catalogue/92521cd9-194d-3cbf-906c-7301d6990ad9/ journal article 10.1080/00222933.2013.791883 1464-5262 5198763 Callibaetis radiatus Navás ( Figure 26 ) Callibaetis radiatus Navás, 1920a ; Gillies, 1990 ; Salles et al., 2003 , p. 13 ; Domínguez et al., 2006 , p. 116 . Callibaetis venulosus Navás, 1932 , p. 114 . Known stages: I ♀ ♂ , N Diagnosis Male imago. (1) Dorsal portion of turbinate eyes oval ( Figure 26A ); (2) forewing hyaline ( Figure 26D ); (3) marginal intercalary veins single ( Figure 26D ); (4) base of subcostal vein with small light brown spot ( Figure 26D ); (5) costal process of hind wing compound ( Figure 26E ); (6) segment I wide at base, segment III of forceps truncated ( Figure 26C ). Female imago. (1) Forewing veins C, Sc and R 1 areas brown pigmented ( Figure 26G ); (2) marginal intercalary veins single ( Figure 26G ); (3) hind wing hyaline ( Figure 26H ); (4) costal process of hind wing compound ( Figure 26H ); (5) abdominal sterna with black anterolateral marks ( Figure 26I ). Mature nymph. (1) Labrum with small medial emargination (fig. 1 in Salles et al. 2003 ); (2) distal margin of labrum with long and simple spine-like setae (fig. 1 in Salles et al. 2003 ); (3) maxillary palp subequal in length of galea-lacinia; (4) glossa subequal in length than paraglossa; (5) forefemur with short spine-like setae near ventral and dorsal margin (fig. 8 in Salles et al. 2003 ). Figure 26. (colour online) Callibaetis radiatus . (A) male imago dorsal view; (B) male imago lateral view; (C) genitalia; (D) male imago forewing; (E) detail of male imago hind wing; (F) female imago dorsal view; (G) female imago forewing; (H) detail of female imago hind wing; (I) female imago ventral view. Comments The imagos of C. radiatus can be distinguished from other species in the genus by the costal process truncated on hind wing. Material examined Male imago and female imago (reared), BRAZIL , Minas Gerais , Viçosa , Ranário – Universidade Federal de Viçosa , 27 / i / 1997 , Silva, E. R . col. ( CZNC ). Female imago (reared), BRAZIL , Minas Gerais , Viçosa , Ranário – Universidade Federal de Viçosa , 18 / i / 1997 , Silva, E. R . col. ( CZNC ). Distribution Argentina , Paraguay and Brazil : Minas Gerais state , Viçosa county.