Cloeodes vaimaca, 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 : 63-65

Cloeodes vaimaca sp. nov.

( Figs. 3 , 26–35 )

Nymph ( Fig. 3 ). Length: body, 4.1–4.2 mm; cerci, 1.4–1.5 mm; terminal filament, 1.3–1.4 mm. Antennae partially broken. Head pale yellow, longer than wide, compound eyes pale yellow. Antennae pale yellow. Mouthparts ( Figs. 26–31 ): labrum ( Fig. 26 a) with one subapical seta centrally and two-three setae near lateral margin, anterior margin with bifid setae ( Fig. 26 b). Left mandible ( Fig. 27 ) without setae between prostheca and mola, thumb of molar area transverse to anterior margin. Right mandible ( Fig. 28 ) without setae between prostheca and mola. Hypopharynx ( Fig. 29 ): lingua with rounded projection and longer than superlinguae. Maxillae ( Fig. 30 ), palpi scarcely shorter than galea-lacinia, two segmented, segment II with a constriction. Labium ( Fig. 31 ) with segment III of palpi rounded.

Thorax pale yellow. Pleura pale yellow, sterna whitish. Legs pale yellow. Dorsal edge of femora with a row of pointed spines, apically with a rounded projection and two blunt spines ( Fig. 32 ). Tarsal claws 0.4 times the length of tarsi. Hind wing pads present.

Abdomen pale yellow, segments I–V with a reddish spot in the midline. Abdominal terga with covers, posterior margin of terga with spines as in Fig. 33 . Sterna pale yellow with trachea pigmented, sterna II-VI with a tuft of long fine setae laterally on each side. Paraprocts with spines apically ( Fig. 34 ). Gills ( Fig. 35 ) translucent, trachea pigmented, 2.5 times the length of each tergum. Caudal filaments pale yellow, 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 (similar to Fig. 35 ).

Etymology. Vaimaca was one of the four charrúas taken to Paris in 1833 to be exhibited in the "Museum of the Man ". This fact crowned the humiliation and destruction of this people for the colonial Spanish model. We dedicate respectfully this species to his memory.

Diagnosis. Cloeodes vaimaca 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. 29 ); 3) labium ( Fig. 31 ) with segment III of palpi rounded; 3) dorsal margin of femora with a row of pointed spines, apically with a rounded projection and two blunt spines ( Fig. 32 ); 4) abdominal color pattern as in Fig. 3 , with segments I-V with a reddish spot in the midline

Material. Holotype male nymph: URUGUAY, Flores, R. 57, km 30, Arroyo Guardia Vieja, S 33º 42´12´´, W 57º 06´17´´, 120m, 6/ 3/ 2008, Emmerich & Pérez colls. Paratypes: three nymphs (one dissected) same data as holotype. One nymph: Paysandú, R. 3, km 366, Arroyo Sacra, S 32º 21´02´´, W 58º 03´04´´, 10m, 7/ 3/ 2008, Emmerich & Pérez colls. One nymph: Río Negro, R 3, Km 291, Camping. Arroyo San Esteban, S 32° 50’ 07’’, W 57º 30’ 59’’, 34 m, 2/ 3/ 0 8, D. Emmerich & S. Pérez colls.

Figures

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

FIGURES 26 – 35. Cloeodes vaimaca sp. nov. Nymph. Mouthparts (Figs. 26 – 31): 26 a, labrum, left d. v., right v. v.; 26 b, labrum: apical setae; 27, left mandible v. v.; 28, right mandible v. v.; 29, hypopharynx v. v.; 30, maxilla v. v.; 31, labium, left d. v., right v. v. 32, leg I. 33, posterior margin of tergum IV. 34, paraproct. 35, gill IV.

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.