Callibaetis (Abaetetuba) sellacki ( Weyenbergh 1883 )

Cruz, Paulo Vilela, Salles, Frederico Falcão & Hamada, Neusa, 2017, Additions and corrections to the systematics of mayfly species assigned to the genus Callibaetis Eaton 1881 (Ephemeroptera: Baetidae) from South America, Zootaxa 4231 (4), pp. 500-534 : 521-523

Callibaetis (Abaetetuba) sellacki ( Weyenbergh 1883)

( Figs. 15 A–16B)

Cloe sellacki Weyenbergh 1883: 164 . (comb. by Eaton 1883)

Cloe lorentzii Weyenbergh 1883: 167 . (syn. by Gillies 1990)

Callibaetis sellacki Eaton 1883: 198 ; Gillies 1990: 27; Nieto 2008: 237; Domínguez et al. 2006: 116; Cruz et al. 2014: 60. Callibaetis trifasciatus (partim) Navás 1915b: 120. (misidentification, the name is not syn. Gillies 1990; McCafferty 1996) Callibaetis fasciatus Ulmer 1921: 246 . (misidentification, the name is not syn. Gillies 1990) Callibaetis lineatus Navás 1932: 82 . (syn. by Gillies 1990)

Baetis gloriosus Navás 1923: 2 . syn. nov.

Callibaetis gloriosus Navás 1930b: 360 . syn. nov. (comb. by Navás 1930b)

Known stages. I ♀♂, N

Diagnosis. Male imago: 1) dorsal portion of turbinate eyes oval (Fig. 173 in Cruz et al. 2014); 2) dorsal portion of turbinate eyes in lateral view without constriction; 3) dorsal portion of turbinate eyes stalk height 0.21 × height of dorsal portion; 4) turbinate portion of compound eyes (in lateral view) with anterior and posterior margins divergent; 5) forewing with two brown bands, apical band parallel to posterior margin (Fig. 176 in Cruz et al. 2014); 6) marginal intercalary veins paired (Fig. 176 in Cruz et al. 2014); 7) hind wing with small marks of pigmentation (Fig. 177 in Cruz et al. 2014); 8) costal process of hind wing pointed (Fig. 177 in Cruz et al. 2014); 9) marginal intercalary veins on hind wing present (Fig. 177 in Cruz et al. 2014); 10) abdominal sterna with pair of medioanterior and medioposterior sigilla strongly pigmented; 11) abdominal sterna washed with red spots and with one anterolateral mark; 12) forceps segment I wide at base (Fig. 175 in Cruz et al. 2014); 13) forceps segment III elongate (Fig. 175 in Cruz et al. 2014).

Female imago: 1) forewing with two bands, apical band parallel to posterior margin (Fig. 179 in Cruz et al. 2014); 2) marginal intercalary veins paired (Fig. 179 in Cruz et al. 2014); 3) hind wing with small marks of pigmentation (Fig. 180 in Cruz et al. 2014); 4) costal process of hind wing pointed (Fig. 180 in Cruz et al. 2014); 5) marginal intercalary veins on hind wing present (Fig. 180 in Cruz et al. 2014); 6) abdomen covered by red spots (Figs. 178 and 181 in Cruz et al. 2014); 7) abdominal sterna with pair of medioanterior and medioposterior sigilla strongly pigmented (Fig. 181 in Cruz et al. 2014).

Mature nymph: 1) distal margin of labrum medially with simple spine-setae (Fig. 61B in Nieto 2008); 2) maxillary palp 1.5 × the length of galea-lacinia (Fig. 65 in Nieto 2008); 3) crown of galea-lacinia with two rows of setae; 4) paraglossa with rounded apex (Fig. 66A in Nieto 2008); 5) paraglossa with one tuft of fine and simple setae on apex; 6) metanotum with spines; 7) foretarsus anterior surface with spine-like setae (Fig. 67 in Nieto 2008); 8) hind claw denticles smaller than foreclaw denticles (Fig. 69 in Nieto 2008).

Comments. Until now, C. gloriosus is considered to be a junior synonym of Callibaetis (A.) fasciatus . After studying the type of C. gloriosus , we observed that the most conspicuous diagnostic character of C. (A.) sellacki is present in C. gloriosus : an apical band on the female forewing, parallel to the posterior margin. Thereby, C. gloriosus is proposed here as junior synonym of C. (A.) sellacki . The type specimens of C. gloriosus possess damaged forewings ( Fig. 16 B), but the apical band is visible and comparable with those presented by Cruz et al. (2014: Figs. 27D, 27G).

We present figures of the dorsal and ventral habitus of the nymphs of C. (A.) sellacki ( Figs. 15 A–15B) and the type of C. gloriosus ( Figs. 16 A–16B).

Material examined. Callibaetis gloriosus , female subimago (type), CHILE, Marga-Marga, Ian 1919, MZB ; Callibaetis lineatus , female imago (type), CHILE, Marga Marga , iii.1931, MZB ; Callibaetis trifasciatus , male imago (type), ARGENTINA, Prov. Buenos Aires, C. Bruch coll., MZB ; two nymphs (one mounted on slides), ARGENTINA, Buenos Aires, Tandil, A ◦ Quequén Chico , 6.i.1983, E. Domínguez coll., INPA ; one male subimago, BRAZIL, Rio Grande do Sul state, Pelotas municipality, 10.xi.1959, Biezanko, M. 1960-3, NHM .

Distribution. Argentina: Bueno Aires. Chile: Marga-Marga. Brazil: Rio Grande do Sul; São Paulo.

Figures

FIGURE 15. Callibaetis (Abaetetuba) sellacki nymphs. A. dorsal view; B. ventral view.

FIGURE 16. Callibaetis gloriosus female subimago syn. nov. (holotype). A. label of type; B. dorsal view.