Cloeodes tracheatus Salles, Massariol & Angeli

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 : 37

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

Figures 3 c, 4d, 25, 26, 30, 31d.

Diagnoses. NYMPH. A) Small body size (c.a. 5.0 mm); B) Body color without marks, gray anteriorly and darker posteriorly ( Figs. 3 c, 4b); C) Labrum, medially, with two long setae ( Fig. 25 a); D) Maxillary palp short (¾ length of galea-lacinia) ( Fig. 25 d); E) Inner margin of labial palp segment III distinctly shorter than outer margin ( Fig. 25 e); F) Distal projection of fore femur short (not exceeding apex of femur, Figs. 26 a, 26b); G) Gills extensively tracheated ( Fig. 26 e).

Nymph (nearly mature). Lengths. Body: 5 mm; cerci: 2.5 mm; terminal filament: 2.5 mm; antenna: 1.5mm.

Coloration ( Figs. 3 c, 4d). General coloration gray. Head whitish washed with gray, except on frons. Legs whitish washed with gray. Terga. Blackish on segments III–X. Sterna . Uniformly washed with gray on segments I– III, and blackish on segments IV–IX. Filaments slightly washed with dark brown at base, blackish at apex.

Head. Labrum ( Fig.25 a). Length about 0.6 × maximum width; dorsal arc with 2 medial setae; ventrally with 6–8 spine-like setae near lateral margin.

Mandibles ( Figs. 25 b, 25c). Denticles of mola not constricted.

Maxilla ( Fig. 25 d). Medially with 1 spine-like seta + 7 apically pointed setae. Maxillary palp short, 3/4 length of galea-lacinia; palp segment II equal to length of segment I.

Labium ( Fig. 25 e). Base of glossa poorly expanded (reaching less than 1/3 of paraglossa); inner and outer margin respectively with around 15 and 12 spine-like setae increasing in length apically; ventral surface scattered with apically pointed, fine, simple setae at base. Paraglossa dorsally with arc of 3 setae close to inner margin; ventrally with arc of 8–10 setae close to inner margin. Labial palp with segment I 0.9 × length of segments II and III combined; segment II dorsally with oblique row of 5 setae; segment III with distal margin rounded; inner margin distinctly shorter than outer margin; ventrally covered with around 20 long setae ( Fig. 25 e); setae on inner margin simple.

Thorax. Hind wing pad. Present.

Fore leg ( Fig. 26 a). Ratio 1.7:1(0.6mm):1.2:0.5. Femur. Length about 5 × maximum width; outer margin with row of 8–10 apically pointed setae (length of setae about 0.1 × maximum width of femur); submarginal setae present; anterior surface and inner margin with around 33–38 curved spine-like setae; posterior surface with row of around 6 scattered setae near inner margin; distal projection short, not exceeding apex of femur ( Fig. 26 b), apically with 3 clavate setae. Tibia. Outer margin with few simple setae; inner margin with two serrate setae on apex; subtending bristle blunt, extending apex of tibia ( Fig. 26 c). Tarsus. Inner margin with row of 24+1 spine-like setae. Tarsal claw. 0.4 × length of tarsus.

Mid and hind legs. Similar to fore leg, except for the lower number of setae on anterior surface of femur.

Abdomen. Terga ( Fig. 26 d). With spines present on posterior margin of segments I–X; larger spines on posterior margin 4.9 × longer than wide.

Sterna . With spines present on posterior margin of segments III–IX.

Gills ( Fig. 26 e). Outer margin smooth; inner margin smooth; medial rib present (weak); tracheae profusely extending from main trunk to inner and outer margins. Gill I reaching half of segment IV, asymmetrically lanceolate. Gill IV as long as length of segments V to VII combined, asymmetric, broad at base. Gill VII extending apex of segment X.

Paraproct ( Fig. 26 f). With 15–17 spines.

Cercus . Distal half with large spines on every two-segments.

Terminal filament. Without large spines.

Male and female imago. Unknown.

Etymology. An allusion to the unusual amount of trachea present on the gills of the species.

Distribution ( Fig. 30 ). Southeastern Brazil, Minas Gerais State, Serra do Intendente (part of Serra do Espinhaço), Parque Estadual da Serra do Intendente.

Type-material. HOLOTYPE. Nymph (on a single slide), BRAZIL, Minas Gerais, Conceição do Mato Dentro, Serra do Intendente, Rio Peixe Tolo, S 19° 0’14.40” W 43°36’45.00”, 731 m. a.s.l., 08–09/ix/2012, Salles FF, col. (CZNC). PARATYPES. 7 nymphs (two on slides), same data as holotype (4 CZNC, 3 DZRJ).

Figures

FIGURE 3. Habitus, nymphs. a. Cloeodes melanotarsus (d. v.). b. Cloeodes melanotarsus (v. v.). c. Cloeodes tracheatus. d. Cloeodes xyrognathos.

FIGURE 25. Cloeodes tracheatus, nymph. a. Labrum (d. v.). b. Right mandible (d. v.). c. Left mandible (d. v.). d. Maxilla (v. v.). e. Labium (v. v.).

FIGURE 26. Cloeodes tracheatus, nymph. a. Fore leg, anterior surface. b. Fore femur, apex projection. c. Apex of fore tibia. d. Posterior margin of segment IV. e. Gill IV. f. 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.).