Paracloeodes waimiri, 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 : 14-15

Paracloeodes waimiri sp. n. ( Figs. 85–95 )

Mature nymph. Length: body, 2.5–2.7 mm; cerci and terminal filament broken. Antennae broken. Head yellowish, vertex with irregular light brown marks. Frontal keel absent, ocelli brown. Antennae pale yellow. Mouthparts: labrum ( Fig. 85 ), dorsally with a pair of subapical setae near middle. Mandibles ( Figs. 86–87 ): external margins straight. Prostheca of left mandible ( Fig. 86 ) with 2 denticles. Lingua slightly shorter than superlingua and rounded apically. Maxillae ( Fig. 88 ) with palpi 1.5 times the length of galea­lacinia. Labium ( Figs. 89 a–b) with segment II of palpi with strong rounded distomedial projection, 2.25 times width of segment III, segment III conical, apically rounded.

Thorax yellowish brown, mesonotum with irregular light brown marks and with two brown spots near posterior margin. Fore wing pads whitish. Pleura brownish, sterna pale yellow. Legs ( Fig. 90 ) yellowish white, apex of femora and tibiae brown, tarsal claws 0.6 times the length of tarsi, with 2 rows of denticles, small basally, increasing in size distally ( Fig. 91 ). Hind wing pads present.

Abdominal coloration yellowish­brown, with brownish marks. Terga with median brownish spots and in females segment V with brownish markings as in Fig. 92 a, and in males segments IV–VI as in Fig. 92 b. Posterior margin of terga with spines 2.0 times wider than long ( Fig. 93 ). Sterna yellowish­white. Gills whitish, apically rounded ( Fig. 94 ). Paraprocts with 12 spines apically ( Fig. 95 ).

Adults. Unknown.

Etymology. Waimiri is the name of one of the indigenous tribes that inhabit the area where the nymphs of this species were collected.

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 with a pair of subapical setae near middle ( Fig. 85 ); 3) labium with segment II of palpi with strong rounded distomedial projection, 2.25 times the width of segment III ( Fig. 89 b); 4) tarsal claws long, 0.6 times the length of tarsi ( Fig. 90 ); 5) hind wing pads present; 6) posterior margin of abdominal terga with spines 2.0 times wider than long ( Fig. 93 ); 7) gills with main branch of trachea poorly pigmented ( Fig. 94 ); 8) paraprocts with 12 spines apically ( Fig. 95 ).

Material. Holotype female nymph: BRAZIL: Amazonas State, Presidente Figueiredo, Igarapé do km 24, remanso; 14/ X/ 2003, Salles col. Paratypes: 9 nymphs same data as holotype (mouthparts, legs and paraprocts of one nymph mounted on slides). Holotype and six paratypes housed at INPA, other paratypes deposited at IFML.

Figures

FIGURE 85 – 95. Paracloeodes waimiri sp. n. Nymph. Mouthparts (Figs. 85 – 89): 85, labrum d. v.; 86, left mandible v. v.; 87, right mandible v. v.; 88, maxilla v. v.; 89 a, labium, left d. v., right v. v.; 89 b, palp: segments II – III. 90, leg I; 91, tarsal claw I. 92 a, female abdominal terga IV – VI; 92 b, male abdominal terga IV – VI; 93, posterior margin of tergum IV. 94, gill IV. 95, paraproct.