Anacroneuria brava Mayorga & Contreras-Ramos, 2017

Mayorga, Alfredo & Contreras-Ramos, Atilano, 2017, The New Species Anacroneuria Brava (Plecoptera: Perlidae), With Provisional Description Of An Unassociated Female, And New Distribution Records From Mexico, Illiesia 13 (2), pp. 23-29 : 24-25

Anacroneuria brava Mayorga & Contreras-Ramos , sp. nov.

http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org: TaxonName:497668

( Figs. 1-5 )

Material Examined. Holotype ♂ (CNIN-PLH-3): MEXICO: Estado de México, Valle de Bravo , [19.19512, -100.13261, post-processed to 10 km radius; mean elevation 1800 m a.s.l.], July 1979, J. Bueno.

Adult habitus. General color of body dark ( Fig. 1 ). Head pigmentation with complex pattern. Pigment pattern over ocelli pentagonal-shaped and black tinted; a truncated arrow-shaped pattern defined by short, fine setae replaces usual M-line; a dark, diamond-shaped area centered on clypeus; lappets obscure and elongate; mesal area of head well defined and sclerotized; anterior to ocelli a zig-zag pattern extends to bases of antennae; circumantennal ridges connect lappets by dark shading to anterior margin of eyes; white rhomboidal-shaped plate located above the ridges; dark triangles with middle inclined brown band at posterior area of eyes. Pronotum with narrow, brown mid longitudinal stripe; discs dark with scattered rugosities obscured; a paler, wide transverse band ( Fig. 2 ). Wing membrane dark brown with veins darker ( Fig. 1 ). Fore leg completely dark brown, with subtle dark stripe at proximal end of femur.

Male. Forewing length 20 mm. Hammer absent. Ventral: Aedeagal apex truncate and straight, little constricted at base; aedeagus arms slightly widened and curved subapically bearing a pair of small membranous lobes at center. Hooks slender, typical in appearance; space between hooks forming an antique door lock-shape; interior corners from the base of hooks sclerotized with a small bulge on both sides at vertex; frontal walls of mesal area with some bristles on each side ( Fig. 3 ). Dorsal: Simple. Aedeagal keel consists of a lengthened projection with straight margins laterally, circular anteriorly and triangular posteriorly, poorly sclerotized and transparent ( Fig. 5 ).

Female. Unknown.

Larva. Unknown.

Distribution. Mexico, Estado de México, Valle de Bravo.

Diagnosis. This species is similar to A. aethiops (Walker, 1852) , A. brailovskyi Stark & Kondratieff,

2004, A. flavifacies Jewett, 1958 and A. ratcliffei Stark & Kondratieff, 2004 in pronotal pigment pattern, however that of A. brava is far more complex ( Fig. 2 ). The body size of A. brava is also larger than A. aethiops , A. braivloskyi and A. flavifacies . The aedeagus of A. brava is similar to A. brailovskyi but its apex is truncate, while in A. brailovskyi it is concave. The shape of the dorsal, transparent keel ( Figs. 3, 5 ), clearly distinguishes this one from all other Anacroneuria species.

Comments. This is one of the largest and darkest species of Mexican Anacroneuria ( Fig. 1 ). The specimen was found pinned on the pronotum, and was unpinned and transferred to EtOH; body coloration, pigment patterns, and diagnostic structures are well preserved.

Etymology. The species name, used as a noun in apposition, is based to the type locality of “Valle de Bravo”.

Figures

Figs. 1-2. Anacroneuria brava sp. nov. 1. Adult habitus. 2. Male head and pronotum.

Figs. 3-5. Anacroneuria brava sp. nov. 3. Aedeagus, ventral. 4. Aedeagus, lateral. 5. Aedeagus, dorsal.