Anacroneuria rotunda sp. n.

Figs. 1A–1 E.

Material examined. Holotype male (CZNC): Brazil (BRA), Espírito Santo State (ES), Alegre, S20°37'11,4" W41°37'35.4", 04–05.iv.2016, light trap , FFST. Paratypes (CZNC): 12 males: BR, ES, Alegre, S20°37'11,4" W41°37'35.4", 04–05.iv.2016, light trap , FFST.

Description. General color dark brown, almost black. Head brown with M-line distinct, areas of clypeus brown, frons orange (Fig. 1A); lappets black; clypeal area setose; post frontal line U-shaped; scape and pedicel dark brown; flagellum dark brown; palpi brownish. Pronotum dark brown almost black with lighter rugosities (Fig. 1A). Legs dark brown to black, tibia darker and tarsi lighter. Wing membrane brown, veins dark brown. Cerci dark brown almost black.

Male: Forewing length 11.7–12 mm (n=13). Hammer truncate, wider than long (Fig. 1 B). Penial armature with a pair of medial distal membranous vesicles (Figs. 1 C–1E) and apex bottleneck-shaped, opening relatively large; in lateral view, keel convex apically (Fig. 1 E), dorsal view, U-shaped (Fig. 1 C); hooks relatively short and flattened, little curved and with acute apices (Fig. 1 D).

Remarks. The dark color of this species is uncommon in regional species. In dorsal view (Fig. 1 C) and lateral view (Fig. 1 D), the penial armature resembles those of A. singela Duarte & Lecci 2016 described from northeastern Brazil. In this species, however, the keel is not convex apically as in the new species. Additionally, A. rotunda is smaller and darker than A. singela.

Etymology. The specific epithet makes reference to the bulged shape of the keel in dorsal and lateral views. The word rotunda derives from the Latin "rotundus," round, spherical or, orbicular.