Paracloeodes eurybranchus Lugo­Ortiz & McCafferty

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

Paracloeodes eurybranchus Lugo­Ortiz & McCafferty ( Figs. 28–39 )

P. eurybranchus Lugo­Ortiz & McCafferty, 1996: 166 .

Nymph and female imago. Characterized by Lugo­Ortiz & McCafferty (1996) with the following necessary changes: tarsal claws with two rows of denticles, small basally and 6–7 larger denticles distally ( Fig. 35 ). Caudal filaments with crown of spines on each segment, cerci with long spines toward the external margin every two segments ( Fig. 39 ).

Discussion. Paracloeodes eurybranchus can be distinguished from the other species of the genus by the following combination of characters. In the nymphs, 1) frontal keel present; 2) antennae 2–2.5 times width of head capsule; 3) labrum with a pair of subapical setae near middle ( Fig. 28 a); 4) hypopharynx: lingua shorter than superlingua and scarcely projected apically ( Fig. 31 ); 5) mandibles with external margins straight ( Figs. 29–30 ); 6) maxillary palpi 1.2–1.4 times the length of galea­lacinia ( Fig. 32 ); 7) segment II of labial palpi with rounded distomedial projection, 1.8 times width of segment III ( Fig. 33 ); 8) hind wing pads present; 9) tarsal claws 0.45 times length of tarsi ( Fig. 34 ), with two rows of denticles, small basally and 6–7 larger denticles distally ( Fig. 35 ); 10) posterior margin of abdominal terga with spines 2.5 times longer than wide ( Fig. 36 ); 11) gills with trachea pigmented ( Fig. 37 ); 12) paraprocts with 16–18 spines apically ( Fig. 38 ); 13) caudal filaments with crown of spines on each segment, cerci with long spines toward the external margin every two segments ( Fig. 39 ).

Material. Twenty nymphs: ARGENTINA, Córdoba, Río Nono, 5 km de Mina Clavero, S 31º48'16'', W65º00'14'', 840 m, 14–15/ XI/ 2001, Nieto & Orce colls. Fifteen nymphs are housed at IFML, other nymphs deposited at IBRJ.

Figures

FIGURE 28 – 39. Paracloeodes eurybranchus. Nymph. Mouthparts (Figs. 28 – 33): 28 a, labrum, left d. v., right v. v; 28 b, labrum: apical setae; 29, left mandible v. v.; 30, right mandible v. v.; 31, hypopharynx v. v.; 32, maxilla v. v.; 33, labium, left d. v., right v. v. 34, leg I; 35, tarsal claw I. 36, posterior margin of tergum IV. 37, gill IV. 38, paraproct. 39, caudal filament detail: left cercus, right terminal filament.