Camelobaetidius francischettii Salles, Andrade & Da­Silva, sp. n.

Nymph. Body length: 5.3­6.2 mm. Caudal filaments length: 4.8­6.1 mm.

Head (Figs. 1, 2). General coloration brown, vertex with irregular yellowish marks, frons marked with white as in Fig. 2; turbinate portion of male compound eyes dark reddish brown. Antennae brownish­translucent. Labrum (Fig. 3) anterodorsally with several long, fine, simple setae, and with few short, fine, simple setae, scattered over surface; 2.5x wider than long. Left mandible (Fig. 4) with incisors with five denticles; prostheca robust, apically denticulate; minute, acute setae, between prostheca and subtriangular process. Right mandible (Fig. 5) with incisors with five to six denticles; prostheca robust, narrower than left prostheca; minute, acute setae, between prostheca and mola. Hypopharynx as in Fig. 6. Maxillae (Fig. 7) with 1+1 fine, simple, setae; palp segment one cylindrical. Labium (Fig. 8) with glossae with 12 fine, simple setae medially, and eight to ten fine, simple setae distally; paraglossae longer than glossae, apically with two rows of long, apically pectinate setae, dorsally with two robust, simple setae; segment 2 of labial palp with distomedial process rounded and strongly produced, inner margin with fine, simple setae, eventually with two acute setae, and dorsally with six long, fine, simple setae; segment three scattered with few acute setae over surface.

Thorax. Pro and mesonotum light brown, with brownish marks as in Fig. 1. Metanotum brown. Pleurae and sterna yellowish­white. Legs (Figs. 1, 10, 11) with ventral margin of fore femora presenting prominent protuberance near base and entirely scattered with spines, dorsal margin with row of long, robust, simple setae; femora light brown, with brownish marks as in Fig. 10; fore tibia with ventral margin entirely scattered with spines, with indentation at apex, and abundant, fine, simple setae on dorsal margin; mid and hind tibiae with ventral margin scattered with few short, acute, simple setae; tibiae brown ventrally and light brown dorsally; ventral margin of tarsi with row of 12 to 13 apically pointed, simple setae, and one long, fine, simple seta; tarsal claws with 34 to 37 denticles (Fig. 11); small thoracic gill present at base of fore leg (Fig. 9). Prosternum with single, medial protuberance (Fig. 9).

Abdomen. General coloration brown, with light brown marks as in Fig. 1. Posterior margin of terga as in Fig. 12. Sterna whitish­brown. Gills (Fig. 13) whitish, with main trachea unpigmented, margins light brown. Paraprocts (Fig. 14) with ca. 22 marginal small spines. Terminal filament approximately the length of the 10 th segment (Fig. 1). Cerci light brown.

Adults. Unknown.

Type material. Holotype: female nymph, Alagoas, Murici, waterfall at the Fazenda Pedra Branca, 09°11,114’S, 35°55,627’W, 16/iii/2004, C.N. Francischetti leg (MNRJ) . Paratypes: two nymphs, same data as holotype (DZRJ); two nymphs, same data as holotype (IFML) .

Additional non­type material. 2 nymphs, Rio de Janeiro, Piraí, Reservatório de Ribeirão das Lajes, Cachoeira Maria Ferreira, BIOÁQUA leg (LAQU). 6 nymphs, same data, except Cachoeira do Sertão (LAQU).

Etymology. We are pleased to name this species after our friend and colleague, Cesar Nascimento Francischetti, collector of the type­material and several other mayflies studied byus.

Distribution: Alagoas, Murici, and Rio de Janeiro, Piraí.