Cloeodes dialutoi, Nieto, Carolina & Emmerich, Daniel, 2011

Nieto, Carolina & Emmerich, Daniel, 2011, Three new species of the genus Cloeodes Traver (Ephemeroptera: Baetidae) from Uruguay, Zootaxa 2996, pp. 57-65 : 59-61

Cloeodes dialutoi sp. nov.

( Figs. 1 , 4–14 )

Nymph ( Fig. 1 ). Length: body, 4.6–4.7 mm; cerci, 1.9–2.0 mm; terminal filament, 1.7–1.8 mm. Antennae broken. Head yellowish brown, longer than wide, compound eyes reddish brown. Antennae pale yellow. Mouthparts ( Figs. 4–9 ): labrum ( Fig. 4 ) with one subapical seta centrally, anterior margin with bifid setae (similar to Fig. 15 b). Left mandible ( Fig. 5 ) without setae between prostheca and mola, thumb of molar area transverse to anterior margin. Right mandible ( Fig. 6 ) without setae between prostheca and mola. Hypopharynx ( Fig. 7 ): lingua with rounded projection and subequal in length to superlinguae. Maxillae ( Fig. 8 ), palpi as long as galea-lacinia, two segmented, segment II with a constriction. Labium ( Fig. 9 ) with segment III of palpi rounded.

Thorax yellowish brown. Fore wing pads yellowish. Pleura brownish, sterna pale yellow. Legs pale yellow, femora with median brownish bands, apical margin of tibiae and basal margin of tarsi brownish. Dorsal margin of femora ( Fig. 10 ) with a row of blunt spines, apically with a subquadrangular projection and two blunt spines. Tarsal claws 0.3 times the length of tarsi. Hind wing pads present.

Abdomen as in Fig. 1 , segments I, IV, VIII with reddish markings, segments II-III, VI-VII, IX-X brownish, segment V pale brown, segments I-VI with two pale spots near midline. Abdominal terga with covers and some scales (following Kluge, 1997), posterior margin of terga with spines as in Fig. 11 . Paraprocts ( Fig. 12 ) with 12–13 spines apically. Gills ( Fig. 13 ) translucent, trachea pigmented, 2 times the length of each tergum. Caudal filaments pale yellow, except apically brownish, with flattened setae basally sclerotized ( Fig. 14 b). Cerci with long spines toward external margin every two segments, terminal filament with long spines toward midline every two segments ( Fig. 14 a).

Adults. Unknown

Etymology. This species is dedicated to William Dialuto, because of him the richness of Rocha's ecosystems is known. His commitment to preservation of the environment is invaluable.

Diagnosis. Cloeodes dialutoi sp. nov. can be distinguished from the other species of the genus by the following combination of characters: 1) hind wing pads present; 2) labium with segment III of palpi rounded ( Fig. 9 ); 3) dorsal margin of femora with a row of blunt spines, apically with a subquadrangular projection and two blunt spines ( Fig. 10 ); 4) abdominal color pattern in Fig. 1 , with segments I, IV, VIII with reddish spots, segments II-III, VI-VII, IX-X brownish, segment V pale brown.

Material. Holotype male mature nymph: URUGUAY, Rocha, Paraje. El Oratorio, Finca Sr. Cabrera, Arroyo Sauce Chico de los Méndez, S 34º 01´16´´, W 53º 57´32.6´´, 121m, 24/ 3/ 2010, Emmerich & Molineri colls. Paratypes: six nymphs (one dissected) same data as holotype. Two nymphs: Maldonado, R 109, Cerro Cordillera, Arroyo sin nombre, S 34º 20’ 29.4’’, W 54º 37’ 40.5’’, 301 m. 23/ 3/ 2010. D. Emmerich & C. Molineri colls.

Figures

FIGURES 1 – 3. Nymphs, dorsal habitus. 1, Cloeodes dialutoi sp. nov. 2, Cloeodes guenoa sp. nov. 3, Cloeodes vaimaca sp. nov.

FIGURES 4 – 14. Cloeodes dialutoi sp. nov. Nymph. Mouthparts (Figs. 4 – 9): 4, labrum, left d. v., right v. v.; 5, left mandible v. v.; 6, right mandible v. v.; 7, hypopharynx v. v.; 8, maxilla v. v.; 9, labium, left d. v., right v. v. 10, leg I. 11, posterior margin of tergum IV. 12, paraproct. 13, gill IV. 14 a, cercus and terminal filament; 14 b, cercus, detail of setae.

FIGURES 15 – 25. Cloeodes guenoa sp. nov. Nymph. Mouthparts (Figs. 15 – 20): 15 a, labrum, left d. v., right v. v.; 15 b, labrum: apical setae; 16, left mandible v. v.; 17, right mandible v. v.; 18, hypopharynx v. v.; 19, maxilla v. v.; 20, labium, left d. v., right v. v. 21, leg I. 22, posterior margin of tergum IV. 23, paraproct. 24, gill IV. 25, cercus and terminal filament.