Microcentrum amacayacu Cadeña-Castañeda & Sovano, 2015

Da Silva Sovano, Rafael S. & Cadena-Castañeda, Oscar J., 2015, New species of Microcentrum Scudder, 1862 (Orthoptera: Tettigonioidea: Phaneropteridae) from Amazon rainforest, Zootaxa 3937 (3), pp. 591-600 : 593

Microcentrum amacayacu Cadeña-Castañeda & Sovano n. sp.

( Fig. 1 )

Diagnosis. Tegmen lanceolate; stridulatory vein evenly thickened from the anal to the distal margin, curving gently towards the median portion. Tympanic foramen brown in both sides. Cerci elongated, dorsal apex armed with a sclerotic plate, ventral apex unarmed, forming a forceps. Subgenital plate rectangular with an U-shaped emargination. Styles cylindrical.

Holotype. ♂ Colombia, Amazonas, Parque Natural Nacional Amacayacu , (3º50’02’’s / 69º 54’W). 100 m. 5 de mayo del 2012. C. Rodriguez leg. (MUD).

Description. Color: Predominantly olive-green ( Fig. 1 A). Head: Fastigium of the vertex 1.5 times as wide as the antennal scape, continuous to the fastigium of the frons ( Fig. 1 B). Lateral ocellus spherical and conspicuous. Central ocellus yellow-greenish, spherical and conspicuous as well. Compound eyes globose reddish-brown. Thorax: Pronotum smooth. Pronotal disc plane, anterior margin lightly ondulate in the median portion ( Fig. 1 C), lateral lobes with straight anterior margin (Fig, 1D), and lower margin gently curving from the median part to the humeral sinus. Tegmen lanceolate, semicoriacea, enlarged at the median portion and narrowing towards the apex. Stridulatory vein two thirds as long as the width of the posterior margin of pronotal disk, evenly thickened, and curving gently in the median portion. Legs: Fore and mid femura unarmed, fore and mid tibiae armed with small spines on the ventral margin. Tympanic organ brown pigmented on both sides, genicular lobes unarmed. Abdomen: Tenth tergite without modification, lanceolate epiproct. Cerci tumescent, elongated, surpassing the subgenital plate ( Fig. 1 E), dorsal apex armed with a sclerotic plate, ventral apex unarmed, forming a forcep. Subgenital plate longer than wide ( Fig. 1 F), emargination in the posterior margin U-shaped, styles cylindrical and twice as long as the emargination of the subgenital plate.

Female. Unknown.

Etymology. The specific epithet refers to Amayacu, south of Colombia, type locality of the species.

Measurements. LB: 50, Pr: 5, Teg: 36, HF: 19, HT: 21, PS: 2.5, C: 3.

Comments. This species resembles M. irregulare and Microcentrum championi Saussure & Pictet, 1898 , but differs in thickness and in the apex of cerci, shape of the subgenital plate and length of styles, also the shape of the stridulatory vein.

Figures

FIGURE 1. Microcentrum amacayacu, Cadena-Casteñada, Sovano n. sp. A) Holotype, lateral view; B) Frons; C) Pronotal disc; D) Pronotum lateral lobes; E) Cerci, dorsal view; F) Subgenital plate, ventral view.