Paracloeodes binodulus Lugo­Ortiz & McCafferty

Nieto, Carolina & Salles, Frederico Falcaõ, 2006, Revision of the Genus Paracloeodes (Ephemeroptera: Baetidae) in South America, Zootaxa 1303, pp. 1-33 : 9-10

Paracloeodes binodulus Lugo­Ortiz & McCafferty ( Figs. 23–27 )

Paracloeodes binodulus Lugo­Ortiz & McCafferty (1996): 163 .

This species was characterized by Lugo­Ortiz & McCafferty (1996). We collected new material assignable to this species by possession of a mesonotum with a pair of median tubercles ( Fig. 25 ). Herein we include the following characteristics that were omitted or are not in agreement with the original description:

Mature nymph ( Fig. 23 ). Head yellowish, with brownish and blackish marks, ocelli brown. Antennae pale yellow. Mouthparts: labrum ( Fig. 24 ), dorsally with a pair of subapical setae near middle. Mandibles with inner set of incisors at right angle with outer set. Molars of left mandible with constrictions. Prostheca of right mandible bifid. Maxillae with palpi 2 times the length of galea­lacinia. Labium with segment II of palpi with rounded distomedial projection, 2.2 times the width of segment III, segment III conical. Thorax yellowish, with brownish and blackish marks as in Fig. 23 . Pleura yellowishbrown, sterna yellowish. Legs with femora whitish­yellow, with subapical brown band, tibiae whitish­yellow with apical brown band, tarsal claws 0.5 times the length of tarsi, with 2 rows of denticles, small basally, increasing in size distally ( Fig. 26 ). Hind wing pads absent.

Abdomen yellowish, with brownish and dark brown marks, posterior margin of abdominal terga with spines 1.2 times longer than wide. Sterna with basal half yellowish and distal half brown. Gills whitish, apically rounded, main branch of trachea poorly pigmented ( Fig. 27 ). Paraprocts with 8 spines apically. Caudal filaments yellowish with two brown bands, one medial and one subapical.

Adults. Unknown.

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. 24 ); 4) labium with segment II of palpi with rounded distomedial projection, 2.2 times the width of segment III; 5) mesonotum with a pair of median tubercles ( Fig. 25 ); 6) tarsal claws long, 0.5 times the length of tarsi; 7) hind wing pads absent; 8) posterior margin of abdominal terga with spines 1.2 times longer than wide; 9) gills with main branch of trachea poorly pigmented ( Fig. 27 ); 10) paraprocts with 8 spines apically.

Material. 16 nymphs, BRAZIL, Amazonas State, Manaus, Estrada para Presidente Figueiredo, Igarapé Água Fria, 4/ VII/ 2005, Salles & Falcão colls. Twelve nymphs housed at INPA, other nymphs deposited at IFML.

Figures

FIGURE 23 – 27. Paracloeodes binodulus. Nymph. 23, General view. 24, labrum, d. v. 25, thorax, lateral view with arrow pointing to median tubercles. 26, tarsal claw I. 27, gill IV.