Anacroneuria singularis, Righi-Cavallaro, Karina O. & Lecci, Lucas S., 2010

Righi-Cavallaro, Karina O. & Lecci, Lucas S., 2010, Three new species of Anacroneuria (Plecoptera: Perlidae) from Centre-West and Southeast Brazil, Zootaxa 2683, pp. 35-44 : 43-44

Anacroneuria singularis sp. n.

( Figs. 13–18 )

Material examined. Holotype, male: BR, MS, Chapadão do Sul, Fazenda Stella I, Rio Indaiá Grande (19.53055S 52.49166W), 16.XII.2008, KORC, MRC, LP, RCP. Paratypes: BR, SP, Pedregulho, Córrego do Pedregulho (20.21666S 47.43333W), 2 m, 26 f, 18.II–21.III.1989, CGF, LGO, MJNF; 1 m, 8 f, 18.V.1989, LGO, MJNF; 5 f, 15.VI.1989, CGF, LGO, MJNF; 2 m, 1 f, 13.VII.1989, CGF, LGO, MJNF; 2 m, 2 f, 17.VIII.1989, CGF, LGO, MJNF; 8 m, 1 f, 18.IX.1989, CGF, LGO, MJNF; 6 m, 7.XI.1989, CGF, LGO, MJNF; 2 m, 7 f, 06.X.2000, CGF, LGO, MJNF. Rio Indaiá Grande (19.53055S 52.49166W), 1 m, same data as holotype, 8 m, 17.XII.2008, KORC, MRC, LP, RCP.

Description. General colour light brown. Genae yellowish. Ocelli and frons encompassed by a quadrate area of light yellow ( Fig. 13 ). Clypeal area and labrum yellowish. Scape and pedicel of antennae light brown, rest of antennae brown. Palpi light brown. Pronotum trapezoidal, light brown with light yellow median stripe, rugosities lighter. Legs light brown, tibiae and tarsi darker. Wing light brown hyaline and veins brown, C, Sc and R veins darker. Abdomen yellowish. Cerci brownish.

Male. Forewing length, 9.7–10.9 mm, n=15. Hammer ( Fig. 14 ) a simple truncate cone. Penial armature ( Figs. 15, 16 ), in dorsal view, narrows abruptly in a distal quarter to a rounded apex; hooks distinctly curved around apical part of the penial armature. In lateral view, distal portion of the hooks slightly curved dorsally and with rugosities, surface of distal half irregular, apices pointed. Distal ventral vesicles absent.

Female. Forewing length, 12.1–16.7 mm, n=15. Subgenital plate four-lobed ( Fig. 17 ), median lobes separated by a slightly deep rounded notch; lateral notches shallow. Posterior margin of St9 sinuous to almost straight, slightly sclerotized, lateral longer hairs moderately dense; some long hairs at margin. Egg oval, blackish, 0.34 x 0.19 mm ( Fig. 18 ).

Remarks. This species differs from its congeners in having penial hooks that curve much further dorsally. Etymology. Singularis , Latin, meaning unique. The name is in reference to the unique penial armature of the species.

Figures

FIGURES 13 – 16. Anacroneuria singularis, sp. n. Male: 13, head and pronotum, scale bar = 1.0 mm; 14, hammer, scale bar = 0.5 mm; 15 – 16, penial armature, dorsal and lateral, scale bar = 0.2 mm.

FIGURES 17 – 18. Anacroneuria singularis, sp. n. Female: 17, sterna 8 – 9, scale bar = 0.5 mm; 18, egg, scale bar = 0.3 mm.