About Chrysilla acerosa Wang & Zhang, 2012
Chrysilla acerosa is a species of medium-sized jumping spider first described by Wang & Zhang in 2012. Males of the species have a total body length between 6.71 and 9.70 mm, while females are slightly smaller, reaching approximately 7.16 mm in total length. The male has a dark brown oval prosoma, the front section of the body, which is longer than it is wide, and bears iridescent setae on the head region. Male chelicerae are elongate and brown. Male legs are long, slender, and yellowish brown; the first leg femur has a black anterolateral surface that shows a metallic blue luster when the spider is alive. The male opisthosoma, or abdomen, is brown with distinct white longitudinal markings running along its midline, and brick red markings on its sides. Females share similar general appearance with males but are smaller in size; their opisthosoma is relatively stouter than that of males, and bears three white and two brick red markings when alive. This species can be distinguished from closely related species by its specific genital structures. Males have a retrolateral tibial apophysis that is wider than it is long, with a tip positioned ventrally, and a significantly longer embolus. Females have copulatory openings located toward the anterior of the genital structure, and piriform spermathecae. Chrysilla acerosa occurs across parts of Asia, with confirmed records from India, China, and Vietnam. Within China, the species has been documented in Chongqing and Sichuan, specifically including the Jinyun Mountain National Natural Reserve. Individuals of this species have been collected from natural forest reserves and university campuses, at elevations ranging from 238 to 517 meters above sea level.
