Paracloeodes peri, Nieto, Carolina & Salles, Frederico Falcaõ, 2006

Nieto, Carolina & Salles, Frederico Falcaõ, 2006, Revision of the Genus Paracloeodes (Ephemeroptera: Baetidae) in South America, Zootaxa 1303, pp. 1-33 : 12-13

Paracloeodes peri sp. n. ( Figs. 63–73 )

Mature nymph ( Fig. 63 ). Length: body, 3.8–4.2 mm; cerci and terminal filament broken. Antennae broken. Head white, vertex with irregular light brownish marks. Frontal keel absent, ocelli grayish. Antennae pale yellow. Mouthparts: labrum ( Fig. 64 ), dorsally with a pair of subapical setae near middle. Left mandible with external margin straight, prostheca with 2 denticles ( Fig. 65 ). Right mandible with external margin convex ( Fig. 66 ). Lingua slightly shorter than superlingua and rounded apically. Maxillae ( Fig. 67 ) with palpi 1.5 times the length of galea­lacinia. Labium ( Figs. 68 a–b) with segment II of palpi with broadly rounded distomedial projection, 2.5 times width of segment III, segment III conical.

Thorax blackish, except for pale markings on mesonotum and apical 2/3 of forewing pads white ( Fig. 63 ). Pleura blackish and sterna pale yellow. Legs ( Fig. 69 ) whitish, coxae and trochanter blackish, tarsal claws 0.4 times the length of tarsi, with 2 rows of denticles, small basally, increasing in size distally ( Fig. 70 ). Hind wing pads present.

Abdomen with terga II–VI and IX–X blackish, with darker areas close to anterior margin; terga I, VII and VIII whitish ( Fig. 63 ). Posterior margin of terga with spines as long as wide ( Fig. 71 ). General coloration of sterna similar to terga, except segments II–VI lighter. Gills ( Fig. 72 ) whitish, external margin sclerotized, apically rounded, main branch of trachea weakly pigmented. Paraprocts ( Fig. 73 ) blackish with 9 spines.

Adults. Unknown.

Etymology. Peri is the name of an indigenous character from Brazilian literature, who inhabited the area where the nymphs were collected. The epithet is in honor of the late Brazilian writer José de Alencar.

Discussion. This species can be distinguished from the other species of the genus by the following combination of characters, 1) frontal keel absent; 2) labrum ( Fig. 64 ) with a pair of subapical setae near middle; 3) lingua slightly shorter than superlingua and rounded apically; 4) maxillary palpi 1.5 times the length of galea­lacinia; 5) segment II of labial palpi with broadly rounded distomedial projection, 2.5 times the width of segment III ( Fig. 68 b); 6) hind wing pads present; 7) tarsal claws long, 0.4 times the length of tarsi ( Fig. 69 ) with 2 rows of denticles, small basally, increasing in size distally ( Fig. 70 ); 8) posterior margin of abdominal terga with spines as long as wide ( Fig. 71 ); 9) gills ( Fig. 72 ) with main branch of trachea weakly pigmented; 10) body color pattern as in Fig. 63 .

Material. Holotype male nymph: BRAZIL, Rio de Janeiro State, Nova Friburgo, Rio Cascatinha, 18/ IV/ 2001, Salles & Francischetti colls. Paratypes: 6 nymphs same data as holotype (mouthparts, legs and paraprocts of one nymph mounted on slides). Holotype and 4 nymphs housed at IBRJ, other paratypes deposited at IFML.

Figures

FIGURE 63 – 73. Paracloeodes peri sp. n. Nymph. 63, General view. Mouthparts (Figs. 64 – 68): 64, labrum d. v.; 65, left mandible v. v.; 66, right mandible v. v.; 67, maxilla v. v.; 68 a, labium, left d. v., right v. v.; 68 b, palp: segments II – III. 69, leg I; 70, tarsal claw I. 71, posterior margin of tergum IV. 72, gill IV. 73, paraproct.