Cloeodes barituensis, Nieto, Carolina & Richard, Barton, 2008

Nieto, Carolina & Richard, Barton, 2008, The genus Cloeodes (Ephemeroptera: Baetidae) in Argentina with new generic synonymy and new species, Zootaxa 1727, pp. 1-21 : 6-8

Cloeodes barituensis n. sp.

( Figs. 1–14 )

Male imago ( Fig. 1 ). Length: body, 5.9–6.1 mm; fore wings, 6.7–6.8 mm. Head yellowish brown. Compound eyes orange brown, height of stalk half length of eye diameter. Antennae yellowish brown. Thorax yellowish brown. Legs pale yellow. Leg I: tibia 1.5 times the length of femur; tarsi as long as tibia with 4 segments decreasing in length apically. Fore wings ( Fig. 2 ) hyaline, except costal and subcostal spaces translucent, hind wings absent. Abdomen: segments I, VII–X yellowish brown; segments II–VI pale yellow, posterior margins of terga with a dark transverse line. Genitalia ( Fig. 3 ) with bases of forceps close together, segment III rounded. Cerci yellow.

Female imago. Length: body, 7.2–7.3 mm; fore wings, 8 mm. Similar to male imago except head yellow. Fore wings ( Fig. 4 ) with marginal intercalary veins single. Cerci yellowish brown.

Nymph ( Fig. 5 ). Length: body, 5.0– 6.5 mm; cerci, 1.6–1.8 mm; terminal filament, 1.5–1.6 mm. Antennae, 1.4–1.7 mm. Head yellow, longer than wide; compound eyes of the male grey brown. Antennae ( Fig. 6 ) pale yellow, 1.5 times the head capsule, pedicel 1.5 times the length of scape. Mouthparts: labrum ( Fig. 7 ) with one subapical seta centrally and two setae near lateral margin, anterior margin with basally bifid setae near midline and apically bifid setae near lateral margin. Left mandible (similar to Fig. 57 ), without setae between prostheca and mola, thumb of molar area transverse to anterior margin. Right mandible ( Fig. 8 ) without setae between prostheca and mola. Hypopharynx ( Fig. 9 ): lingua with a rounded projection. Maxillae ( Fig. 10 ), palpi as long as galea-lacinia, two segmented, segment II with a constriction. Labium (similar to Fig. 61 ), with segment III of palpi rounded.

Thorax yellowish brown, median line yellow. Fore wing pads yellow. Sterna pale yellow. Legs yellow, tarsi and tarsal claws yellowish brown. Femora ( Fig. 11 ) dorsally with a row of short blunt spines, ventrally with spines, apically with a subquadrangular projection (similar to Fig. 48 ). Tibia with bipectinate spines. Tarsi with short spines. Tarsal claws 0.4 times the length of tarsi. Hind wing pads absent.

Abdominal color pattern with segments I, X and anterior margin of segment II yellowish brown, segments IV, VIII and IX yellow, other segments yellowish brown with yellow spots as in Fig. 5 . Posterior margin of terga with spines as in Fig. 12 , except tergum I smooth. Sterna pale yellow, sterna II–VI with a small tuft of long fine setae laterally on each side. Paraprocts with spines apically, similar to Fig. 67 . Gills ( Fig. 13 ) translucent white, 2 times the length of each tergum, trachea pigmented. Caudal filaments yellow, 1/3 apically yellowish brown, with flattened setae basally sclerotized (similar to Fig. 30 ). Cerci with long spines toward external margin every two segments, terminal filament with long spines toward midline dorsally and ventrally every two segments ( Fig. 14 ).

Etymology. Baritú is the name of one of the rivers where this species was collected.

Diagnosis. Cloeodes barituensis n. sp. can be distinguished from the other species of the genus by the following combination of characters. In the imago, 1) female with fore wings with single marginal intercalary veins, male with fore wings with paired marginal intercalary veins; 2) hind wings absent; 3) male with genitalia ( Fig. 3 ) with bases of forceps close together, segment III rounded. In the nymph, 1) hind wing pads absent; 2) posterior margin of abdominal tergum I smooth ( Fig. 5 ); 3) abdominal color pattern with segments I, X and anterior margin of segment II yellowish brown, segments IV, VIII and IX yellowish, other segments yellowish brown with yellow spots as in Fig. 5 ; 4) femora apically with a subquadrangular projection (similar to Fig. 48 ); 5) dorsal edge of femora with a row of blunt spines (similar to Fig. 48 ); 6) caudal filaments with flattened setae basally sclerotized (similar to Fig. 30 ), cerci with long spines toward to external margin every two segments and terminal filament with long spines toward midline dorsally and ventrally every two segments ( Fig. 14 ).

Material. Holotype: male nymph: ARGENTINA, Salta, Río Colorado, S 23°22'09'', W 64°28'11'', 406 m, 1/ VI/ 2000, Romero, Molineri, Manzo & Nieto colls. Paratypes: 30 nymphs same data as holotype; 1 male imago (reared), 3 male and 2 female imagos, 20 male and 4 female subimagos: Depto. Santa Victoria, Baritú, Río Baritú, 1500 m, 10–17/ IX/ 1981, Domínguez col.; 5 nymphs: Aguas Blancas, Estación Jakulica, Río Pescado, Arroyo Arrazayal, 7–11/ XII/ 1984, Domínguez col. Material housed in IFML.

Figures

FIGURES 1 – 4. Cloeodes barituensis n. sp. Male imago. 1, head and thorax, d. v.; 2, fore wing; 3, genitalia v. v. Female imago. 4, fore wing.

FIGURES 5 – 14. Cloeodes barituensis n. sp. Nymph. 5, general view, dorsal. 6, antennae. Mouthparts (Figs. 7 – 10): 7, labrum, left d. v., right v. v.; 8, right mandible v. v.; 9, hypopharynx v. v.; 10, maxilla v. v. 11, leg I. 12, posterior margin of tergum IV. 13, gill IV. 14, terminal filament, left cercus, right caudal filament.

FIGURES 55 – 67. Cloeodes penai. Nymph. 55, antennae. Mouthparts (Figs. 56 – 61): 56, labrum, left d. v., right v. v.; 57, left mandible v. v.; 58, right mandible v. v.; 59, hypopharynx v. v.; 60, maxilla v. v.; 61, labium, left d. v., right v. v. 62, leg I; 63, femur I apical margin; 64, tarsal claw I. 65, posterior margin of tergum IV. 66, gill IV. 67, paraproct.

FIGURES 43 – 51. Cloeodes opacus n. sp. Nymph. 43, general view, dorsal. Mouthparts (Figs. 44 – 46): 44, labrum, left d. v., right v. v.; 45, labrum: anterior margin; 46, labium, left d. v., right v. v. 47, leg I; 48, dorsal margin of femur I. 49, posterior margin of tergum IV. 50, gill IV. 51, paraproct. Figs. 52 – 54. Cloeodes penai. Male imago: 52, fore wing; 53 a, hind wing; 53 b, hind wing detail; 54, genitalia v. v.

FIGURES 20 – 30. Cloeodes espinillo n. sp. Nymph. 20, general view. Mouthparts (Figs. 21 – 24): 21, labrum, left d. v., right v. v.; 22, left mandible v. v.; 23, hypopharynx v. v.; 24, labium, left d. v., right v. v. 25, leg I; 26, dorsal margin of femur I. 27, posterior margin of tergum IV; 28, sternum IV. 29, gill IV. 30, cercus.