Cloeodes magnus 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 : 31

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

Figures 2 d, 21, 22, 30.

Diagnoses. NYMPH. A) Large body size (> 7.0 mm); B) Body color pattern with distinct darker marks on abdominal terga ( Fig. 2 d); C) Labrum, medially, with two long setae ( Fig. 21 a); D) Maxillary palp short (¾ length of galea-lacinia, Fig. 21 d); E) Inner margin of labial palp segment III subequal to margin ( Fig. 21 e); F) Distal projection of fore femur short (not exceeding apex of femur, Figs. 22 a, 22b); G) Gills without medial rib ( Fig. 22 e).

Nymph (nearly mature). Lengths. Body: 10.4–12.0 mm; cerci: 3.9 mm; terminal filament: 3.9 mm; antenna: 3.0.

Coloration ( Fig. 2 d). General coloration yellowish-white profusely washed with dark brown. Head yellowish washed with brown, except around lateral ocellus and below median ocellus. Legs yellowish washed with brown, except for two unpigmented stripes close to inner margin of femur; tarsus darker. Terga. Segments IV and VIII less pigmented; segment IX with a medial less pigmented area; segments II, III and VII sometimes less pigmented, but never as in segments IV and VIII; segments I–IX medially with a longitudinal unpigmented stripe. Sterna yellowish washed with brown, darker on segments VII–IX; segments III–IX with a sublateral brown stripe. Filaments yellowish-white washed with brown on basal half and washed with dark brown on apical ¼.

Head. Labrum ( Fig. 21 a). Length about 0.6 × maximum width; dorsal arc with 2 medial setae; ventrally with 5–6 spine-like setae near lateral margin.

Mandibles ( Figs. 21 b, 21c). Denticles of mola constricted at base (as in fig. 6f).

Maxilla ( Fig. 21 d). Medially with 1 spine-like seta + 9 apically pointed setae. Maxillary palp short (¾ length of galea-lacinia, Fig. 21 d); palp segment II 2.0 × length of segment I.

Labium ( Fig. 21 e). Base of glossa expanded (reaching at least half of paraglossa); inner and outer margin respectively with around 20 and 15 spine-like setae increasing in length apically; ventral surface scattered with few short 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 slightly truncate; inner margin subequal to outer margin; ventrally covered with around 30 long setae ( Fig. 21 e); setae on inner margin serrate.

Thorax. Hind wing pad. Present.

Fore leg ( Fig. 22 a). Ratio 1.8:1(0.8mm):1:0.2. Femur. Length about 4.5 × maximum width; outer margin with row of 11–12 blunt, clavate setae (length of setae about 0.1 × maximum width of femur); submarginal setae absent; anterior surface and inner margin with around 40 spine-like setae; posterior surface bare; distal projection distinct, but not exceeding apex of femur ( Fig. 22 b), 0.1 × width of femur, apically with 3 clavate setae. Tibia. Outer margin with many simple setae; inner margin with one simple seta on apex; subtending bristle blunt, clavate, extending apex of tibia ( Fig. 22 c). Tarsus. Inner margin with row of 14+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, subapical projections of femur less developed and type of setae on inner apex of tibia (simple instead of serrate).

Abdomen. Terga ( Fig. 22 d). With spines present on posterior margin of segments I–X; large spines intercalated by short spines, larger spines 4.9 × longer than wide.

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

Gills ( Fig. 22 e). Outer margin serrated on distal 1/4; inner margin slightly serrated; medial rib absent; tracheae extending from main trunk to inner and outer margins. Gill I subequal in length to segment II, oval. Gill IV reaching 1/2 of segment VI, asymmetric, broad at middle. Gill VII reaching 1/2 of segment IX.

Paraproct ( Fig. 22 f). With 12–14 spines.

Cercus . With large spines on every four segments at base and on every two segments toward apex.

Terminal filament. With spines on every four segments.

Male and female imago. Unknown.

Etymology. Magnus , great in Latin. Reference to the size of the species, so far the largest among Cloeodes .

Distribution ( Fig. 30 ). Southern Brazil, Santa Catarina State, Serra Geral.

Type-material. HOLOTYPE. Nymph (on two slides, one with mouth parts, legs and gills, one with abdomen), BRAZIL, Santa Catarina, Urubici, Cachoeira do Avencal, S 28°02’55.1” W 49°37’00.0”, 1220 m.a.s.l., 02/x/2011, Boldrini R, col. (CZNC). PARATYPES. 5 nymphs, same data as holotype (3 CZNC, 2 INPA).

Figures

FIGURE 2. Habitus, nymphs, dorsal view. a. Cloeodes guara. b. Cloeodes ioachimi. c. Cloeodes lucifer. d. Cloeodes magnus.

FIGURE 21. Cloeodes magnus, nymph. a. Labrum (d. v.). b. Right mandible (d. v.). c. Left mandible (d. v.). d. Maxilla (v. v.). e. Labium (v. v.).

FIGURE 22. Cloeodes magnus, 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.).