Paracloeodes ibicui Lugo­Ortiz & McCafferty

Nieto, Carolina & Salles, Frederico Falcaõ, 2006, Revision of the Genus Paracloeodes (Ephemeroptera: Baetidae) in South America, Zootaxa 1303, pp. 1-33 : 10-11

Paracloeodes ibicui Lugo­Ortiz & McCafferty ( Figs. 40–49 )

P. i b i c u i Lugo­Ortiz & McCafferty, 1996: 167.

Nymph. This species was described by Lugo­Ortiz & McCafferty (1996) from Paraguay. We collected new material assignable to this species that present two character differences from the original description. The longitudinal dark brown band on abdominal segments I–IX is absent and the tarsal claws have two rows of 5–6 small denticles basally and 3–5 larger denticles distally ( Fig. 47 ). Additional new characters include, antennae long, 3.5–4 times the width of head capsule; maxillary palpi 1.5–1.6 times the length of galea­lacinia ( Fig. 44 ); caudal filaments with crown of spines on each segment, cerci with long spines toward the external margin every two segments basally, and every four segments apically ( Fig. 49 ).

Adult. Unknown.

Discussion. Paracloeodes ibicui can be distinguished from the other species of the genus by the following combination of characters, 1) frontal keel present; 2) antennae long, 3.5–4 times width of head capsule; 3) labrum with short setae dorsally, without a pair of subapical setae near middle ( Fig. 40 ); 4) hypopharynx: lingua shorter than superlingua and slightly projected apically ( Fig. 43 ); 5) left mandible with external margin straight ( Fig. 41 ), right mandible with external margin convex ( Fig. 42 ); 6) maxillary palpi 1.5–1.6 times the length of galea­lacinia ( Fig. 44 ); 7) segment II of labial palpi with rounded distomedial projection, 2.25 times width of segment III ( Fig. 45 ); 8) ventral edge of femora and tarsi with bipectinate spines ( Fig. 46 ); 9) femora with a transverse dark band subapically ( Fig. 46 ); 10) hind wing pads present; 11) tarsal claws 0.4 times the length of tarsi ( Fig. 46 ), with two rows of 5–6 small denticles basally and 3–5 larger denticles distally ( Fig. 47 ); 12) posterior margin of abdominal terga with spines 2.5 times longer than wide (as in Fig. 36 ); 13) gills with main branch of trachea and a few secondary branches pigmented ( Fig. 48 ); 14) cerci with long spines toward the external margin every two segments basally, and every four segments apically ( Fig. 49 ).

Material. Ten nymphs: ARGENTINA, Misiones, Pque. Prov. Urugua­i, Aº Uruzú, RP 19, 7­11/ XII/ 1999, Molineri col. Material housed at IFML.

Figures

FIGURE 40 – 49. Paracloeodes ibicui. Nymph. Mouthparts (Figs. 40 – 45): 40, labrum, left d. v., right v. v. (apical setae omitted); 41, left mandible v. v.; 42, right mandible v. v.; 43, hypopharynx v. v.; 44, maxilla v. v.; 45, labium, left d. v., right v. v. 46, leg I; 47, tarsal claw I. 48, gill IV. 49, caudal filament detail: left cercus, right terminal filament.

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.