Cloeodes guenoa, 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 : 61-63

Cloeodes guenoa sp. nov.

( Figs. 2 , 15–25 )

Nymph ( Fig. 2 ). Length: body, 4.9–5.1 mm; cerci, 1.4–1.5 mm; terminal filament, 1.2–1.3 mm. Antennae broken. Head yellowish brown, longer than wide, compound eyes yellowish brown. Antennae pale yellow. Mouthparts ( Figs. 15–20 ): labrum ( Fig. 15 a) with one subapical seta centrally and one seta near lateral margin, anterior margin with bifid setae ( Fig. 15 b). Left mandible ( Fig. 16 ) without setae between prostheca and mola, thumb of molar area transverse to anterior margin. Right mandible ( Fig. 17 ) without setae between prostheca and mola. Hypopharynx ( Fig. 18 ): lingua with rounded projection and longer than superlinguae. Maxillae ( Fig. 19 ), palpi as long as galealacinia, two segmented, segment II with a constriction. Labium ( Fig. 20 ) with segment III of palpi rounded.

Thorax pale yellow. Pleura yellowish brown, sterna pale yellow. Legs yellowish brown. Dorsal margin of femora with a row of pointed spines, apically with a subquadrangular projection and two blunt spines ( Fig. 21 ). Tarsal claws 0.3 times the length of tarsi. Hind wing pads present.

Abdomen yellowish brown ( Fig. 2 ), segments III-VII with two whitish spots near midline, segments IV and VIII pale brown. Abdominal terga with covers, posterior margin of terga with spines as in Fig. 22 . Paraprocts with 10–11 spines apically ( Fig. 23 ). Gills translucent white, main and secondary trachea pigmented ( Fig. 24 ), 2 times the length of each tergum. Caudal filament yellowish, with flattened setae basally sclerotized (similar to Fig. 14 b). Cerci with long spines toward external margin every two segments, terminal filament with long spines toward midline every two segments ( Fig. 25 ).

Adults. Unknown.

Etymology. “ Guenoa ” is the name of the native people who inhabits the current districts of Treinta y Tres, Cerro Largo and Tacuarembó.

Diagnosis. Cloeodes guenoa sp. nov. can be distinguished from the other species of the genus by the following combination of characters: 1) hind wing pads present; 2) lingua with rounded projection and longer than superlinguae ( Fig. 18 ); 3) labium with segment III of palpi rounded ( Fig. 20 ); 4) dorsal margin of femora with a row of pointed spines, apically with a subquadrangular projection and two blunt spines ( Fig. 21 ); 5) abdominal color pattern as in Fig. 2 , with segments III-VII with two whitish spots near midline, segments IV and VIII pale brown.

Material. Holotype female mature nymph, URUGUAY, Tacuarembó, R5, km 379, Arroyo Tranqueras, S 31º47´29´´, W 55º 58´51´´, 124m, 22/ 2/ 2008, Emmerich & Molineri colls. Paratypes six nymphs (one dissected) same data as holotype. Three nymphs: Lavalleja, R8, km 190, Arroyo Tapes Chico, S 33º 59´18´´, W 54º 46´54´´, 130m, 4/ 3/ 2008, Emmerich & Pérez colls. One nymph: Treinta y Tres, Quebrada de los Cuervos, Arroyo Los Helechos, S 32º 55’ 27.3’’, W 54º 27’ 34.4’’, 125 m. 8/ 11/ 2004, D. Emmerich & E. Morelli colls. Six nymphs: Maldonado, R 109, Cerro Cordillera, Arroyo sin nombre, S 34º 20’ 29.4’’, W 54º 37’ 40.5’’, 301 m, 23/ 3/ 10, 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 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.

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.