Anacroneuria caraa De Ribeiro & Froehlich

De, Valdelânia R. & Froehlich, Claudio G., 2007, Two new species of Anacroneuria (Plecoptera: Perlidae) from southern Brazil, Zootaxa 1624, pp. 53-57 : 55

Anacroneuria caraa De Ribeiro & Froehlich , sp. n.

( Figs. 6–10 )

Diagnosis. Frons mostly light brown, M–line light, lappets brown ( Fig. 6 ). Genae and parietalia light brown. Antennae and palpi brown. Pronotum pale brownish, darker laterally. Legs brown, mid and hind femora bicolored. Wing membrane and veins light brown, C and Sc paler. Basal cercomere light, rest brownish.

Male. Forewing length, 11.8 mm. Hammer a short truncate cone ( Fig. 7 ). Hooks regularly curved with pointed tips ( Fig. 8 ). Ventral vesicles large. In lateral view, the penial apex bends dorsally ( Fig. 10 ). Dorsal keel absent. Ventral membrane near base of hooks with a scaly appearance ( Fig. 9 ).

Female. Unknown.

Type Material. Holotype, male: BRAZIL, Rio Grande do Sul, Caraá , Rio dos Sinos (29º42'53’’S 50º17'19”W), 0 4. XII. 2003.

Distribution. Known from the type locality.

Etymology. The name refers to the municipality in which it was collected. Noun in apposition.

Remarks. This species was collected together with A. fuscicosta ( Enderlein 1909) , to which it bears some resemblance. The latter, however, is darker and, medially on the frons, the brown pigment occupies the area from the postfrontal line to the M-line. They are readily separable by their penial armatures; that of A fuscicosta having a ventrally sloping apex, small ventral vesicles and apices of hooks blunt. In fact, the penis of A. caraa , with its lack of a keel, the large ventral vesicles and the upturned apex form a unique combination in the genus. The scaly area in the ventral membrane near the base of the hooks of A. caraa is also uncommon.

Figures

FIGURES 6 – 10. Anacroneuria caraa. 6 – 10, male; 6, head and pronotum; 7, hammer; 8 – 10, penial armature, dorsal,