Cloeodes aiuruoca Massariol, Angeli & Salles

Salles, F. F., Massariol, F. C., Angeli, K. B., Lima, M. M., Gattolliat, L. & Sartori, M., 2015, Revealing the diversity of Cloeodes Traver, 1938 (Ephemeroptera: Baetidae) in the Neotropics: description of eleven new species from Brazilian mountain ranges, Zootaxa 4020 (1), pp. 1-50 : 3-4

Cloeodes aiuruoca Massariol, Angeli & Salles , sp. nov.

Figures 1 a, 4a, 6, 7, 30, 31c.

Diagnosis. NYMPH. A) Large body size (> 7.0 mm); B) Body color pattern predominantly uniform ( Figs. 1 a, 4a); C) Labrum, medially, with two long setae ( Fig. 6 a); D) Maxillary palp short (around ¾ length of galea-lacinia, Fig. 6 g); E) Inner margin of labial palp segment III distinctly shorter than outer margin ( Fig. 6 i); F) Distal projection of fore femur long (distinctly exceeding apex of femur, Figs. 7 a, 7d); G) Gills with medial rib ( Fig. 7 h).

Nymph. Lengths. Body: 7.0–10.0 mm; cerci: 3.0– 4.5 mm; terminal filament: 3.0– 4.5 mm; antenna: 2.0– 2.5 mm.

Coloration ( Figs. 1 a, 4a). General coloration yellowish-white washed with brown. Head light brown with light yellow narrow longitudinal stripe on whole length of vertex; frons with area between antennal sockets yellowish. Thorax yellowish brown with brownish marks. Fore leg with coxa brown; trochanter yellowish-brown; femur yellowish washed with brown, except at base and apex of anterior surface; tibia and tarsus brown. Abdomen yellowish-brown washed with brown to dark brown with one lighter medial longitudinal stripe; segments II–VIII with yellowish smooth antero-sublateral area; segments VIII and IX eventually lighter. Sterna yellowish-brown. Caudal filaments brown with a yellowish band subdistally.

Head. Labrum ( Figs. 6 a, 6b). Length about 0.9 × maximum width; dorsal arc with two medial setae; ventrally with 7–9 spine-like setae near lateral margin.

Hypopharynx as in Fig. 6 c.

Mandibles ( Figs. 6 d, 6e). Margin between prostheca and mola of left mandible with short spine-like setae ( Fig. 6 f); denticles of mola constricted at base ( Fig.6 f).

Maxilla ( Fig. 6 g). Medially with 1 spine-like seta + 8 apically pointed setae. Maxillary palp short (around ¾ length of galea-lacinia); palp segment II equal to length of segment I.

Labium ( Figs. 6 h, 6i, 6j). Base of glossa expanded (reaching at least half of paraglossa); inner and outer margin respectively with around 20 (ir in Fig. 6 j) and 15 (or in Fig. 6 j) pointed setae increasing in length apically; ventral surface scattered with few short setae at base. Paraglossa dorsally with arc of 4 setae close to inner margin (dia in Fig. 6 j); ventrally with arc of 8–10 setae close to inner margin (via in Fig. 6 j). Labial palp with segment I 0.9 × length of segments II and III combined; segment II dorsally with oblique row of 8 setae; segment III with distal margin slightly truncate; inner margin distinctly shorter than outer margin; ventrally covered with around 20 long setae; setae on inner margin serrate.

Thorax. Hind wing pad. Present.

Fore leg ( Fig. 7 d). Ratio 1.7:1(0.8mm):1:0.2. Femur. Length about 4.5 × maximum width; outer margin with row of 6–11 clavate setae ( Fig. 7 e); submarginal setae absent; anterior surface and inner margin with around 25 spine-like setae; posterior surface with around 15 scattered setae near inner margin; distal projection exceeding apex of femur ( Fig. 7 a), 0.4 × width of femur, apically with 3 clavate setae. Tibia. Outer margin with few simple setae; inner margin with two serrate setae on apex; subtending bristle blunt, clavate, extending apex of tibia ( Fig. 7 f). Tarsus. Inner margin with row of 12–17+1 spine-like short setae. Tarsal claw. 0.2 × length of tarsus.

Mid and hind legs ( Figs. 7 b, 7c). Similar to fore leg, except for subapical projections of femur less developed and type of setae on inner apex of tibia on (simple instead of serrate).

Abdomen. Terga ( Fig. 7 g). Spines present on posterior margins of segments III–X; larger spines on posterior margin of tergum IV 3.2 × longer than wide.

Sterna . Spines present on posterior margin of segments IV–IX (segment III rarely with scarce spines).

Gills ( Figs. 7 h, 7i). Outer margin serrated on distal 1/4; inner margin slightly serrated; medial rib present; few secondary tracheae extending from main trunk to inner and outer margins. Gill I about 3/4 length of segment II; truncate. Gill IV 1 1/2 length of segment V, asymmetric, broad at middle. Gill VII about 1 1/2 length of segment VIII.

Paraproct ( Fig. 7 j). With 12–14 marginal spines.

Cercus . Without large spines.

Terminal filament. Without large spines.

Male and female imago. Unknown.

Etymology. After the type-locality, River Aiuruoca .

Distribution. Southeastern Brazil, Minas Gerais State, Serra da Mantiqueira, Parque Nacional de Itatiaia ( Fig. 30 ).

Type-material. HOLOTYPE. Nymph (on a single slide), BRAZIL, Minas Gerais, Itamonte, Rio Aiuruoca , S 22°18'31.30" W 44°42'7.30", 1440 m.a.s.l., 07/ix/2000, Nessimian, JL, col. (CZNC). PARATYPES. 15 nymphs (three on slides), same data as holotype (5 CZNC, 5 UFRJ, 3 MZL, 2 IBN).

Additional material. 7 nymphs, BRAZIL, Rio de Janeiro, Parque Nacional de Itatiaia, Abrigo Rebouças, S 22°23'6.20" W 44°40'43.40", 11/xi/1978, Dos Santos NO and Pereira SM, col. ( CZNC). 1 nymph, BRAZIL, Rio de Janeiro, Itatiaia, Parque Nacional de Itatiaia, Cachoeira da Maromba, S 22°25'46.10" W 44°37'9.80", 15/viii/1998, Salles FF and Franscischetti CN, col. ( CZNC). 15 nymphs, BRAZIL, Rio de Janeiro, Itatiaia, primeiro riacho, S 22°22'39.90" W 44°41'36.80", 11/ix/1998, Salles FF, col. ( UFRJ). 10 nymphs, BRAZIL, Minas Gerais, Itamonte, Rio Aiuruoca , S 22°18'31.30" W 44°42'7.30", 12/ix/1998, Salles FF, col. 57 nymphs, BRAZIL, Minas Gerais, Itamonte, Rio Auiruoca, S 22°18'31.30" W 44°42'7.30", 07/ix/2000, Salles, F.F., col. ( UFRJ). 34 nymphs, BRAZIL, Minas Gerais, Itamonte, Rio Aiuruoca , S 22°18'31.30" W 44°42'7.30", 08/ix/2000, Assis JCF, Oliveira ALH and Passos MI, col. ( CZNC).

Figures

FIGURE 1. Habitus, nymphs, dorsal view. a. Cloeodes aiuruoca. b. Cloeodes amantykyra. c. Cloeodes atlanticus. d. Cloeodes boldrinii.

FIGURE 6. Cloeodes aiuruoca, nymph. a. Labrum (left d. v., right v. v.). b. Details of submarginal row of ventral setae. c. Hypopharynx (d. v.). d. Right mandible (d. v.). e. Left mandible (d. v.). f. Detail of outer margin of left mandible. g. Maxilla (v. v.). h. Labium (left d. v., right v. v.). i. Detail of segment III of labial palp (v. v.). j. Detail of glossa and paraglossa (left d. v., right v. v.), dia—dorsal inner arc of setae, or—outer row of setae, ir—inner row of setae, via—ventral inner arc of setae.

FIGURE 7. Cloeodes aiuruoca, nymph. a. Fore femur, apex projection. b. Mid femur, apex projection. c. Hind femur, apex projection. d. Fore leg, anterior surface. e. Detail of setae on dorsal margin. f. Apex of fore tibia. g. Posterior margin of segment IV. h. Gill IV. i. Detail of gill margin. j. Paraproct (v. v.).

FIGURE 30. Political map of South America (showing Brazilian states) with details of the distribution of the new species of Cloeodes according to the altitude (white, from 0 to 400 m. a. s. l.; light gray from 400 to 800 m. a. s. l.; dark gray from 800 to 1200 m. a. s. l.; and black, above 1200 m. a. s. l.).