Brachybaenus nariniensis, Cadena-Castañeda, Oscar J., Gutiérrez, Yeisson & Bacca, Tito, 2016

Cadena-Castañeda, Oscar J., Gutiérrez, Yeisson & Bacca, Tito, 2016, New and little known Orthoptera (Ensifera and Caelifera) from the Ñambí River Natural Reserve, Nariño, Colombia, Zootaxa 4162 (2), pp. 201-224 : 219-221

Brachybaenus nariniensis n. sp.

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName:475237 Diagnosis. Medium-size and moderately robust appearance. Body general coloration brown purple with yellow legs and ventral surface. Hind-femora with prominent spines in the ventral-internal margin. Epiproct inconspicuous and mostly covered by the tenth tergite, cerci simple, distal margin of the subgenital plate without notch.

Holotype. 1 male. Colombia, Nariño, Barbacoas, Reserva Natural Río Ñambí , 1335m. 1°17’44’’ N – 78°4’45.3’’ W. 1 December 2002. Victor Solarte Cabrera. (CAUD).

Description. Male. Purple Brown head, pronotum, abdomen, tegmina, femora apex and tibiae base.Yellow legs, antennomeres, mandibles, palpi and ventral Surface of the body ( Figs. 26 I,J). Head ovoid, longer than wide; vertex rounded and projecting dorsally between the eyes and antennae. Inter-antennae space as wide as the scapus; scapus prominent, cylindrical and 1.5 times as long as the maximum width of the eye. Frontal ocellus round and diffuse; eyes ovoid, longer than wide ( Fig. 26 A). Pronotum with irregular surface, formed by brief tubercles and a slight prominence; pronotal disk with a yellow stripe in the midline. Fore and meso-femora cylindrical, gently flattened in the distal portion and unarmed in the ventral portion. Fore-tibiae with two spines in the meso-distal portion of both in the ventral-internal and external margin, mesotibiae unarmed in the central portion. Hind-femora with wide base and tapers gently from distal to mesal portion, armed with six spines in the ventral-outter and five in the ventral-inner margin, the latter being larger, distributed from the mesal to apical portion ( Fig. 26 D). Hind-tibia cylindrical, with three spines in the dorsal-outter and four in the dorsal-inner edge, distal portion with two mobile and fixed (of smaller size) spines, a pair at each side. Tegmina lanceolate, covering the tip of the abdomen, vein pattern as in Figs. 26 B,C. Tenth tergite without modification, posterior margin rounded; epiproct three times wider than long and largely concealed by the tenth tergite ( Figs. 26 E,F). Cerci cylindrical and tomentose, slightly curving backward ( Fig. 26 G). Subgenital plate rectangular and wider than long, distal margin gently pronounced and rounded; conic styli ( Fig. 26 H).

Female. Unknown.

Etymology. This new species is named after Nariño, Colombian department where the type locality is located.

Measurements (mm). LT: 16, LB: 14, Pr: 2.5, Teg: 11, HF: 11, HT: 12, PS: 2, C: 2.5.

Comments. This new species is provisionally placed in the genus Brachybaenus as a new organization of the family Gryllacrididae will be soon proposed (Cadena-Castañeda in prep.). This new species is close related to B. titschaki ( Karny 1935) , but can be distinguished because of the coloration, B. titschaki is light brown and B. nariniensis is predominantly purple brown. Furthermore, the spines in the hind-femora are more noticeable in B. nariniensis ; and the edge of the subgenital plate is decidedly emarginated in B. titschaki , and slightly pronounced without exceeding the total length of the styli in B. nariniensis .

Figures

FIGURE 26. Gryllacrididae, Brachybaenus nariniensis n. sp. Male. Rostrum (A), tegminae (B and C), right metafemora (D). Terminalia in rear (E), dorsal (F), lateral (G) and ventral (H) view. Dorsal (I) and lateral (J) habitus. Scale bar 1 cm in all cases.