Cloeodes melanotarsus 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 : 34

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

Figures 3 a, 3b, 23, 24, 30.

Diagnoses. NYMPH. A) Small body size (c.a. 5.0 mm); B) Body color pattern with distinct darker marks on abdominal terga ( Fig. 3 a); C) Labrum, medially, with single long seta ( Fig. 23 a); D) Maxillary palp short (¾ length of galea-lacinia) ( Fig. 23 d); E) Inner margin of labial palp segment III subequal to outer margin ( Fig. 23 e); F) Distal projection of fore femur short (not exceeding apex of femur, Figs. 24 a, 24b); G) Gills without medial rib and poorly tracheated ( Fig. 24 e); H) Tarsi blackish ( Fig. 3 b).

Nymph. Lengths. Body: 4.4–5.2 mm; cerci: 1.6–2.1 mm; terminal filament: 1.6–2.1 mm; antenna: 1.3–1.5 mm.

Coloration ( Figs. 3 a, 3b). General coloration yellowish-white. Head yellowish-white, dark brown stripe below lateral ocellus. Legs yellowish-brown, except apex of femur, base of tibia and tarsus washed with black ( Fig. 3 b). Terga. Segments I–IV with submedial brown mark; segments V and VI almost completely washed with brown; segment X partially washed with brown. Sterna yellowish-white. Filaments yellowish-white with subapical dark brown band.

Head. Labrum ( Fig. 23 a). Length about 0.7 × maximum width; dorsal arc with single medial seta; ventrally with 6–8 spine-like setae near lateral margin.

Mandibles ( Figs. 23 b, 23c). Denticles of mola constricted at base (as in fig. 6f).

Maxilla ( Fig. 23 d). Medially with 1 spine-like seta + 6 apically pointed setae. Maxillary palp not reaching apex of galea-lacinia; palp segment II equal to length of segment I.

Labium ( Fig. 23 e). Base of glossa expanded (reaching at least half of paraglossa); inner and outer margin respectively with around 15 and 12 spine-like setae increasing in length apically; ventral surface scattered with few short setae at base. Paraglossa dorsally with arc of 2 setae close to inner margin; ventrally with arc of 7 setae close to inner margin. Labial palp with segment I 0.8 × length of segments II and III combined; segment II dorsally with oblique row of 6 setae; segment III with distal margin slightly truncate; inner margin subequal to outer margin; ventrally covered with around 20 long setae ( Fig. 23 e); setae on inner margin simple.

Thorax. Hind wing pad. Present.

Fore leg ( Fig. 24 a). Ratio 2:1(0.5mm):1.2:0.4. Femur. Length about 4.6 × maximum width; outer margin with row of 9–10 blunt, clavate setae (length of setae about 0.2 × maximum width of femur); submarginal setae absent; anterior surface and inner margin with around 25 spine-like setae; posterior surface bare; distal projection distinct, but not exceeding apex of femur ( Fig. 24 b), apically with 2 clavate setae. Tibia. Outer margin with few simple setae; inner margin with two serrate setae on apex; subtending bristle clavate, extending apex of tibia ( Fig. 24 c). Tarsus. Inner margin with row of 12+1 spine-like setae. Tarsal claw. 0.3 × 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. 24 d). With spines present on posterior margin of segments I–X; larger spines on posterior margin 4.3 × longer than wide.

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

Gills ( Fig. 24 e). Outer margin serrated on distal 1/4; inner margin slightly serrated; medial rib absent; few secondary tracheae extending from main trunk to inner and outer margins. Gill I about 3/4 length of segment II, oval. Gill IV as long as length of segments V to VI combined, asymmetric, broad at base. Gill VII reaching 1/2 of segment IX.

Paraproct ( Fig. 24 f). With 7–8 spines.

Cercus . With large spines on every two-segments.

Terminal filament. With spines on every four segments.

Male and female imago. Unknown.

Etymology. An allusion to the blackish tarsi 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”, 700 m. a.s.l., 08–09/ix/2012, Salles FF, col. (CZNC). PARATYPES. 22 nymphs (two on slides), same data as holotype (10 CZNC, 7 UFRJ, 5 MZL).

Figures

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

FIGURE 23. Cloeodes melanotarsus, nymph. a. Labrum (d. v.). b. Right mandible (d. v.). c. Left mandible (d. v.). d. Maxilla (v. v.). e. Labium (v. v.).

FIGURE 24. Cloeodes melanotarsus, 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.).