Bianigryllacris Cadena-Castaneda 2019

2. Bianigryllacris Cadena-Castañeda, 2019 (边氏蟋•属)

Bianigryllacris: Cadena-Castañeda. 2019. Zootaxa, 4605(1): 38.

Type species: Apotrechus trilobus Bian & Shi, 2014

Diagnosis. Body small to medium, form robust, apterous. Middle ocellus absent, lateral ocelli absent or inconspicuous, with poorly defined. In male, ninth abdominal tergite enlarged, cuculli-form, posterior area obviously divided into 2 spine-shaped lobes, distinctly curved ventrad, emargination between them deep and triangular; subgenital plate without styli, posterior margin with a deep and wide concavity and with apices digitate laterally; cerci short. In female, subgenital plate broad and long.

Discussion. Liu & Yin (2002) were firstly reported the Apotrechus to the Chinese fauna, and the latter authors (Liu & Bi, 2008; Liu & al., 2010 a; Liu & Shi, 2012; Guo & Shi, 2012; Bian & al., 2014; Liu et al., 2015a) described 7 Chinese species under Apotrechus. Cadena-Castañeda (2019) erected the Bianigryllacris including all the Chinese species of Apotrechus. The genus have obviously difference from Apotrechus in: posterior margin of male ninth abdominal tergite divided into 2 spine-shape lobes, which directing ventrad, between them triangular concave; posterior margin of male subgenital plate with a deep concavity, the lateral lobes digitate apically; female subgenital plate obviously sclerotised without membranous area. In Apotrechus, male ninth abdominal tergite bulbate, apex weakly divided, posterior margin of male subgenital plate projected in the middle, the lateral lobes with or without tubercles apically; female subgenital plate very soft, median area with a soft area.

Species included. The genus is endemic to China with 8 known species.