Paracloeodes morellii, Emmerich & Nieto, 2009

Emmerich, Daniel & Nieto, Carolina, 2009, First record of the genus Paracloeodes Day (Ephemeroptera: Baetidae) in Uruguay and description of two new species, Zootaxa 2225 (1), pp. 57-62 : 60-62

Paracloeodes morellii sp. nov.

( Figs. 13–25 )

Nymph. Length: body: 2.8–3.3 mm; cerci 1.0– 1.3 mm. Antennae 0.7–0.8 mm, 1.5 times the head capsule. General color brownish orange. Head orange brown, with small brownish spots as in Figs. 13–14 . Frontal keel present, ocelli brownish. Antennae: scape and pedicel pale yellow, flagellum pale. Mouthparts ( Figs. 15–20 ): labrum ( Figs. 15 a–b ) dorsally with 2–3 subapical setae near midline, anterior margin with bifid setae. Mandibles ( Figs. 16–17 ) without setae between prostheca and mola, incisors cleft in two sets, inner set at right angle with outer set. Left mandible ( Fig. 16 ) with molars with constrictions, prostheca broad with 1–2 denticles. Right mandible ( Fig. 17 ) with prostheca bifid. Hypopharynx ( Fig. 18 ) with lingua subequal to superlinguae and rounded apically. Maxillae ( Fig. 19 ) with palpi two segmented, 1.5 times the length of galealacinia. Labium ( Fig. 20 ) with segment II of palpi with rounded projection, 2 times width of segment III, segment III conical.

Thorax ( Fig. 13 ) orange brown. Pronotum with a pair of brownish spots in the midline. Mesonotum shadowed with brown and with small brownish spots. Metanotum brownish. Pleura reddish brown, sterna whitish. Legs ( Fig. 21 ) pale yellow. Tarsal claws 0.4 times the length of tarsi, with 2 rows of minute denticles ( Fig. 22 ). Hind wing pads absent. Female ( Fig. 14 ) paler than male and with a brown band in metanotum and anterior portion of fore wing pads.

Abdomen orange brown. Color pattern: segment II–VII with medial elongate spot as in Fig. 13 , segment IX brownish. Posterior margin of terga with spines as long as wide ( Fig. 23 ). Sterna pale yellow, sternum IX brownish except at lateral sides. Gills whitish, translucent, oblong, 1.5 times the length of each tergum. Paraprocts ( Fig. 24 ) with 8–10 spines apically. Terminal filaments pale yellow, with crown of small spines on each segment ( Fig. 25 ).

Adults. Unknown.

Etymology. This species is dedicated to Dr. Enrique Morelli, entomologist of Universidad de la República ( Uruguay) who continually stimulates the study of the aquatic insects of Uruguay.

Discussion. This species can be distinguished from the other species of the genus by the following combination of characters: 1) frontal keel present; 2) antennae short, 1.5 times the head capsule; 3) segment II of labial palpi with rounded projection, 2 times width of segment III ( Fig. 20 ); 4) tarsal claws with two rows of minute denticles ( Fig. 22 ); 5) hind wing pads absent; 6) general color pattern with head and thorax with small spots, abdomen with segment II–VII with medial elongate spot as in Fig. 13 ; 7 ) posterior margin of terga with spines as long as wide ( Fig. 23 ); 8) paraprocts with 8–10 spines apically ( Fig. 24 ); 9) terminal filament with crown of small spines on each segment ( Fig. 25 ).

Material. Holotype, male nymph: URUGUAY, Deptos. Rivera-Tacuarembó, R 44 , km 26.5, A° Carpintería , S 31°48´28´´, W 55°13´09´´, 121 m, 20/02/2008, Emmerich & Molineri col. Paratypes: 5 nymphs same data (mouthparts, legs and paraprocts of 1 nymph mounted on slide); 1 nymph (parts on slide Depto. Durazno, Sarandí del Yi, Río Yi, S 33°20´41´´, W 55°37´07´´, 132 m, 21/02/2008, same collectors; 2 nymphs (1 on slide): Depto. Cerro Largo, ruta 8, km 335, A° Otazo , S 32°50´00´´, W 54°14´55´´, 123 m, 20/02/2008, Same collectors. The holotype and 1 paratype female are deposited in the Museo de la Universidad de la República, Montevideo, Uruguay ( MUR); remaining paratypes are housed in Instituto Miguel Lillo, Tucumán, Argentina ( IML) .

Figures

FIGURES 13–25. Paracloeodes morellii sp. n. Nymph. 13, Male general view; 14, female head and thorax. Mouthparts (Figs. 15–20): 15a, labrum, left d.v., right v.v.; 15b 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, tarsal claw I; 23, posterior margin of tergum IV; 24, paraproct; 25, detail of cercus.

FIGURES 1–12. Paracloeodes charrua sp. n. Nymph. 1, General view. Mouthparts (Figs. 2–7): 2a, labrum, left d.v., right v.v.; 2b, labrum: apical setae; 3, left mandible v.v.; 4, right mandible v.v.; 5 hypopharynx v.v.; 6, maxilla v.v.; 7, labium, left d.v., right v.v.; 8, leg I; 9, tarsal claw I; 10, posterior margin of tergum IV; 11, paraproct; 12, caudal filament detail; 12a, left cercus; 12b, terminal filament.