Anacroneuria fiorentini 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 : 53-55

Anacroneuria fiorentini De Ribeiro & Froehlich , sp. n.

( Figs. 1–5 )

Diagnosis. Frons mostly yellowish with a brown spot on each side extending from M–line to scars; lappets brown ( Fig. 1 ). Parietalia light brown at sides, lighter medially. Antennae and palpi light brown. Pronotum dark brown with a light median stripe. Legs brown, bases of femora lighter. Wing membrane and veins light brown but C and Sc paler. Cerci light brown basally, then bicolored.

Male. Forewing length, 9.6–9.9 mm. In dorsal view, keel well visible, with parallel sides before diverging distally ( Fig. 2 ). In side view, the dorsal surface of the penial armature presents a marked depression in front of the keel, ventral vesicles present, small ( Fig 3 ). Hooks normal, with pointed tips. Hammer a short truncate cone ( Fig. 4 ).

Female. Forewing length, 12.6–13.0 mm. Subgenital plate with four subequal lobes. Median notch deeper than lateral ones. Distal margin of sternum nine straight, field of hairs V–shaped ( Fig. 5 ).

Type Material. Holotype, male: BRAZIL, Rio Grande do Sul, Caraá , Rio dos Sinos (29º42’53”S 50º17’ 19”W), 0 4. XII. 2002. Paratypes: 1 male, 2 females, same data as holotype; 1 male, same data but 29º43'32”S 50º16’57”W.

Distribution. Northeastern Rio Grande do Sul State, Brazil.

Etymology. The name honors Gelson Luiz Fiorentin for his contribution to the knowledge of aquatic insects in Rio Grande do Sul State.

Remarks. The head pattern of A. fiorentini is distinctive, being most similar to that of A. oculatila Jewett (1959) , known from Nova Teutonia, Santa Catarina, Brazil and from Misiones, Argentina ( Froehlich 2002). However, in A. oculatila , the lighter central frons is enclosed by dark pigment and, in the male, the penis is very different, without a dorsal depression, with a V-shaped keel and a downsloping apex. The penial armature of A. fiorentini has some resemblance to that of A. minuta Klapálek (1922) , a species from northern Brazil, especially in the deep depression in front of the keel, but in A. minuta it is deeper, and the apex is broader. In the female, A. minuta has paired patches of hairs in sternum nine.

Figures

FIGURES 1 – 5. Anacroneuria fiorentini. 1 – 4, male; 1, head and pronotum; 2 – 3, penial armature, dorsal and lateral; 4,