Corinnella, Thomas & Dominique, 2006

Cabette, H. R. S., 2017, Corinnella lourii, a rare new species of Baetidae (Ephemeroptera) from central Brazil, Zootaxa 4329 (2), pp. 183-188 : 188

Key to nymphs of Corinnella species

1 Labrum with shallow distomedial emargination (Fig. 4a of Boldrini et al. 2013); posterior margin of terga with rounded spines (Fig. 11 of Boldrini et al. 2013); tarsal claw with seven to nine denticles, inner and outer denticles distinctly longer (Fig. 10c of Boldrini et al. 2013)............................................................................ C. thomasi

- Labrum with broad distomedial emargination ( Fig. 2a ); posterior margin of terga with pointed spines ( Fig. 3c ); tarsal claw with four denticles, one denticle distinctly longer ( Fig. 3b )......................................................... 2

2 General coloration dark grey ( Figs. 1c, 1d ); distomedial emargination of labrum with small notches; all femora heavily washed with gray medially, apical ¼ washed with red ( Figs. 1c , 3a ); gills with costal and anal margins pigmented, pigmentation of tra- chea restricted to middle portion ( Fig. 3c ); apex of hypopharynx rounded ( Fig. 2f )..................... C. lourii , sp. nov.

- General coloration brown; distomedial emargination of labrum without process; femur one with brown stripe close to ventral margin (Fig. 7 of Dominique et al. 2005); gills with costal and anal margins unpigmented, pigmentation of trachea extending from base to apex (Fig. 10 of Dominique et al. 2005); apex of hypopharynx concave ( Fig. 3 of Dominique et al. 2005)................................................................................................... C. eximia

Figures

FIGURE 1. Corinnella lourii sp. nov., nymph. 1 a, head of holotype (frontal view). 1 b, head of holotype (lateral view). 1 c, holotype in lateral view. 1 d, paratype in dorsal view.

FIGURE 2. Corinnella lourii sp. nov., nymph. 2 a, labrum (dorsal view). 2 b, left mandible. 2 c, detail of incisives of left mandible (immature nymph). 2 d, right mandible. 2 e, maxilla. 2 f, hypopharynx. 2 g, labium (left dorsal view, right ventral view).

FIGURE 3. Corinnella lourii sp. nov., nymph. 3 a, foreleg. 3 b, detail of fore tarsal claw. 3 c, lateral half of tergum IV and respective gill. 3 d, paraproct.