Anacroneuria otafroehlichi, 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 : 37

Anacroneuria otafroehlichi sp. n.

( Figs. 1–6 )

Type material. Holotype, male + exuvium: BR, MS, Chapadão do Sul, Fazenda Pedra Branca, Rio Sucuriú (19.24255S 52.83305W), 27.VIII.2008, KORC, MRC, TTMT, RCP. Paratypes: Nymph, 1, same data as holotype, riffle; Adults, 22 m, same data as holotype, 2 m same locality but 09.VI.2008, KORC, MRC, OF, NP.

Description. General colour light yellowish-brown. Area anterior to ocelli forming light yellow patch, rest of head paler ( Fig. 1 ). Scape and pedicel light brown, rest of antenna brown. Palpi yellowish. Pronotum trapezoidal ( Fig. 1 ), yellowish with lateral light brown areas, rugosities darker. Legs yellowish, femora with dark brown band at apex, tibiae and tarsi light brown. Wing hyaline yellowish-brown, veins light brown, Sc and R darker. Abdomen yellowish. Cerci brownish.

Male. Forewing length, 12.2–13.2 mm, n=14. Hammer a simple truncate cone ( Fig. 2 ). Penial armature ( Figs. 3, 4 ) simple, narrowing gradually from base to a blunt apex, apical portion hooks smoothly curved with pointed tips. In a side view, dorsal keel low, a pair of small ventral vesicles present.

Female. Unknown.

Nymph. Pre-emergent body length 12.4 mm. Posterior part of frons yellowish; brown patch in anterior part of the frons extending to ocelli in a smooth, wide arc; an anterior pale band in the clypeal area ( Fig. 5 ). Pronotum brown, similar in coloration to head markings; several small, scattered, circular pale spots and larger, linear pale areas near midline. Femur with dorsal fringe; thick bristles and dark clothing hairs scattered over femur surface except in small hairless oval dorsomedially. Tibia covered by thick bristles, these smaller anteriorly and larger posteriorly; posterior surface with silky fringe of hairs ( Fig. 6 ). Tarsal segments dorsally with band of long bristles. Abdomen terga pale anteriorly, darker posteriorly; all terga covered with short bristles. Cerci armed with sparse apical whorls of short bristles.

Remarks. The penial armature of A. otafroehlichi bears some resemblance to a small group of species including A. polita ( Burmeister, 1839) , A. fuscicosta ( Enderlein, 1909) , A. oculatila Jewett, 1959 , A. novateutonia Jewett, 1959 and A. ofaye Froehlich, 2007 . Anacroneuria otafroehlichi differs from A. polita by its lighter colour and, additionally, by the more rounded apex of the penial armature. Moreover, A. polita is smaller than A. otafroehlichi , with forewing length 7.5–10.1 mm ( Zwick 1972, Froehlich 2004). It differs from A. fuscicosta which has a ventrally sloping apex by having a blunt apex. It differs from A. oculatila and A. novateutonia which have the penial armature tapering to a truncate apex with subapical shoulders; this is absent in A. otafroehlichi . In A. ofaye , the dorsal keel is more elevated and, in dorsal view, resembles a square racket.

Etymology. The specific epithet, otafroehlichi , honors Otavio Froehlich, Universidade Federal de Mato Grosso do Sul, noted ichthyologist, for his contagious enthusiasm, great discussions and overall friendship.

Figures

FIGURES 1 – 4. Anacroneuria otafroehlichi, sp. n. Male: 1, head and pronotum, scale bar = 1.0 mm; 2, hammer, scale bar = 0.5 mm; 3 – 4, penial armature, dorsal and lateral, scale bar = 0.2 mm.

FIGURES 5 – 6. Anacroneuria otafroehlichi, sp. n. Nymph from exuvium: 5, head and pronotum, scale bar = 0.3 mm; 6, foreleg, lateral view, scale bar = 0.3 mm.