Anacroneuria piti, Gonçalves, Maísa De Carvalho, Novaes, Marcos Carneiro & Salles, Frederico Falcão, 2017

Gonçalves, Maísa De Carvalho, Novaes, Marcos Carneiro & Salles, Frederico Falcão, 2017, New species and records of Perlidae (Plecoptera) from Espírito Santo State, Brazil, Zootaxa 4273 (1), pp. 141-150 : 143-145

Anacroneuria piti sp. n.

Figs. 2A–2 D (male) and Figs. 3A–3 F (nymph).

Material examined. Holotype male ( CZNC): Brazil ( BRA), Espírito Santo State (ES), Alegre, Rio Norte , reared, nymph collected 07.viii.2004, emerged 08.viii.2004 .

Description. General color yellowish. Head yellowish with M-line not distinct, parts of clypeal area yellowish and frons light brown ( Fig. 2A ); lappets brown; clypeal area setose; post frontal line not distinct; scape and pedicel light brown; flagellomeres light brown; palpi light brown. Pronotum light brown with lighter rugosities ( Fig. 2A ).

Legs yellowish to light brown, tibia and tarsi darker. Wing membrane light brown with veins darker. Cerci light brown.

Male: Forewing length 11mm (n=1). Penial armature ( Figs. 2 B–2D), in ventral view, gradually tapering from medially to apex and terminating in an indistinct small aperture ( Fig. 2 C), with a pair of small distal membranous vesicles ( Figs. 2 C–2D); in lateral view, pronounced keel apparent ( Fig. 2 D), distinct in dorsal view appearing as two parallels bars ( Fig. 2 B); hooks relatively short and flattened, little curved and with acute apices ( Fig. 2 C).

Nymph: General color brownish. Head brown with lighter areas near post-frontal suture and in frontoclypeal region ( Fig. 3A ); M-line complete, distinct; eyes black and ocelli black with a darker stain medially. Pronotum brownish with median line and sparse areas yellowish ( Fig. 3A ). Mandibles, maxillae, and labium as in Figs. 3 B, 3C, 3D. Forefemur with lateral surface covered by scattered bristles ( Fig. 3 E); dorsally and ventrally with higher density of thick bristles; dorsally with translucent fringe of hairs. Tibia ventrally with thin and sparse translucent bristles, and dorsally with a row of thick bristles in the border and a well-developed band of hairs. Cerci brown with thick bristles; segments differ in shape and size from base to apex ( Fig. 3 E). Thoracic gills: ASC1, PSC1, AT2, AT3 and PT3 (sensu Shepard & Stewart 1983; Stewart & Stark 2002). Measurements (n=7): head width 2.9– 3.3 mm; head length 1.9–2.6 mm; antennae length 4.0–5.0mm; pronotum width 2.5–3 mm; pronotum length 1.5–2 mm; cercal length 6.5–7.5 mm; total length 7.9–9 mm.

Remarks. The color of the adult is similar to many species of the genus. The penial armature of A. pitii in ventral view ( Fig. 2 C) and lateral view ( Fig. 2 D) is most similar to A. itatiaiensis Baldin et. al 2013 also known from southeastern Brazil, but differs in the size of membranous vesicles and apex. In A. pitii , the vesicles are smaller and are more medially than in A. itatiaiensis . The penial armature ( Figs. 2 B–2D) of A. pitii is more robust basally than A. itatiaiensis . In lateral view ( Fig. 2 D), the apex of A. pitii is thinner than A. itatiaiensis ; the hooks are more robust in A. piti . Furthermore the color of A. pitii is lighter than A. itatiaiensis .

Etymology. The patronym honors Pitágoras da Conceição Bispo, a Brazilian Plecoptera specialist.

Figures

FIGURES 2 A – 2 D. Anacroneuria pitii sp. n., Male, 2 A, head and pronotum; 2 B – 2 D, penial armature (2 B dorsal, 2 C ventral and 2 D lateral views). Scales: Fig. 2 A 1.0 mm; Figs. 2 B – 2 D 1.0 mm.

FIGURES 3 A – 3 F. Anacroneuria pitii sp. n., Nymph, 3 A, head; 3 B, right mandible; 3 C, right maxilla; 3 D, labium; 3 E, prothoracic left leg; 3 F, cerci proximal, medial and distal. Scales: Figs. 3 A, 3 E, 3 F: 1.0 mm; Figs. 3 B, 3 C, 3 D: 0.1 mm.