Caenis cuniana Froehlich, 1969

Salinas-Jiménez, Luis Gonzalo, Lima, Lucas Ramos Costa, Rojas-Peña, Jose Ismael & Caro-Caro, Clara Ines, 2024, First record of the nymph of Caenis cuniana Froehlich, 1969 (Caenidae: Ephemeroptera) and new distributional records of Caenidae from Colombia, EntomoBrasilis (e 1087) 17, pp. 1-3 : 3

Caenis cuniana Froehlich, 1969 ( Figures 2; 3A, 3B, 3C )

Material examined. COLOMBIA Seven nymphs, META: Villavicencio, Caño Quenane. 4.075856, -73.376244 ( Figure 1 ), 280 m, 26.ii.2015. Col. J. Rojas Peña, LG. Salinas Jimenez. Previous distribution. Brazil: States of Espírito Santo, Mato Grosso, Pará, Pernambuco, Rio de Janeiro, Roraima and SÃo Paulo. Caenis cuniana was first described based on eggs, nymphs, and female adults from Brazil ( Froehlich 1969); posteriorly the male adult was described by Silva (1993). We present the first record of this species from Colombia, based on nymphs collected in the Colombian Orinoco River basin. The nymphal stage of this species is characterized by: 1) lateral margins of pronotum almost parallel, a little broader anteriorly ( Figures 2-3 in Froehlich 1969 and Figure 76B in Domínguez et al. 2006); 3) coxal processes of middle and hind legs narrow and sickle-shaped with margins smooth (Figure 76E in Domínguez et al. 2006); 4) tarsal claws of fore and middle legs with denticles which increase in size toward apex ( Figures 3A and 3B ), those of hind legs with 3-6 small denticles followed by a row of bifid or multifid setules ( Figure 3C ); and 5) sternum IX rounded (Figures 4 and 5 in Froehlich, 1969).

The Ephemeroptera order in the Colombian Orinoquia region is poorly known with 11 species registered ( Zuñiga & Torres-Zambrano 2015; Dias et al. 2016; Salinas-Jiménez et al. 2017, 2018, 2019; Rojas-Peña et al. 2021; Velásquez-Lopes et al. 2024). This manuscript is the first record of Caenidae species in the Meta state, expanding Ephemeroptera order geographical distribution in Colombian Orinoquia.

Figures

Figure 1. Geographical location of sampling stations of the Quenane river.

Figure 3. Caenis cuniana. A. Fore claw. B. Mid claw. C. Hind claw.