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

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Cloeodes tracheatus Salles, Massariol & Angeli

sp. nov.

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

Figures 3 View FIGURE 3 c, 4 d, 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 View FIGURE 3 c, 4 b); C) Labrum, medially, with two long setae ( Fig. 25 View FIGURE 25 a); D) Maxillary palp short (¾ length of galea-lacinia) ( Fig. 25 View FIGURE 25 d); E) Inner margin of labial palp segment III distinctly shorter than outer margin ( Fig. 25 View FIGURE 25 e); F) Distal projection of fore femur short (not exceeding apex of femur, Figs. 26 View FIGURE 26 a, 26 b); G) Gills extensively tracheated ( Fig. 26 View FIGURE 26 e).

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

Coloration ( Figs. 3 View FIGURE 3 c, 4 d). 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 View FIGURE 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 View FIGURE 25 b, 25 c). Denticles of mola not constricted.

Maxilla ( Fig. 25 View FIGURE 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 View FIGURE 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 View FIGURE 25 e); setae on inner margin simple.

Thorax. Hind wing pad. Present.

Fore leg ( Fig. 26 View FIGURE 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 View FIGURE 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 View FIGURE 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 View FIGURE 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 View FIGURE 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 View FIGURE 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 View FIGURE 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).