Anacroneuria singela, Duarte & Lecci, 2016

Duarte, Tácio & Lecci, Lucas Silveira, 2016, New species and records of Anacroneuria (Plecoptera: Perlidae) from the northeastern semi-arid region of Brazil, Zootaxa 4079 (2) : 297-299

Anacroneuria singela n. sp.

( Figs. 4A–C and Figs. 5A–D ) Type material. Holotype, male: BR, BA: Itatim, Rio Paraguaçu, 26.iii.2012, light trap. Paratypes: BA, Lençóis, Chapada Diamantina, Rio Santo Antônio, 12°29'579''S, 41°19'752''W, 340m, light pan trap, 26.x.2008, ARC, RM & SM, 1 male, 3 females; BA, Iaçu, Rio Paraguaçu, 24.iii.2012, by hand, TD & IG, 1 male.

Description. A median sized species. Holotype, male: forewing length, 14 mm. Paratypes, males (n= 2): forewing length, 13.5–14 mm; females (n= 3): forewing length, 17–17.5 mm.

General color light brown to yellowish. Head yellowish, frons yellowish; clypeus and occiput ochraceous to yellowish ( Figs. 4A, B ). Antennae with scape ochraceous; pedicel and flagellum ochraceous. Palpi yellowish. Pronotum light brown, darker laterally and with lighter median strip. Membrane and veins of wings pale yellowish ( Fig. 4C ). Legs light brown to ochraceous with dark strip in distal part of the femur. Cerci ochraceous.

Male. Sternum IX with dark posterior strip. Hammer a truncate cone shaped ( Fig. 5A ). Penial armature with pair of small distal vesicles. Dorsally terminal tube open in a small gonopore, slightly sclerotized, distal border convex ( Fig. 5B ). Gonopore robust, keel almost rounded in lateral view ( Fig. 5C ). Hooks with closed curve, short and pointed.

Female. Subgenital plate ochraceous to pale, 4-lobed ( Fig. 5D ). Sternum VIII with field of bristles medially; lateral corners with sclerotized band, letero-median portion near the field of large bristles with small sclerotized spot. Sternum IX with a strip of bristles distally; distal portion with V-shaped notch.

Remarks. The penial armature of A. singela resembles that of A. debilis but the robust and almost rounded keel in A. singela separates the male from males of A. debilis . The terminal tube in A. singela is rounded and robust in dorsal and ventral views whereas in A. debilis appears thin. The female subgenital plate of A. singela resembles that of A. debilis , mainly in the form of the lateral lobes, but without the pattern bristles in the median region as indicated by the figures of Zwick (1973).

Etymology. The specific name singela from Latin, meaning simple, without adornment. The name is a noun in apposition.

Figures

FIGURES 4 A – C. Anacroneuria singela n. sp. A. Holotype adult male, head and pronotum. B. Female head and pronotum. C. Forewing of male holotype.

FIGURES 5 A – D. Anacroneuria singela n. sp. A. Holotype adult male, sternum IX. B. Penial armature of the male in ventral view. C. Penial armature in lateral view. D. Female terminalia, ventral view.