Phintella arenicolor

Phintella arenicolor is a small jumping spider showing distinct sexual dimorphism in size and coloration. Males have a body length of 4.30-4.50 mm with a cephalothorax length of 1.65 mm and width of 1.45 mm. The opisthosoma measures 2.20 mm in length and 1.20 mm in width. Females are slightly larger, with a body length of 4.00-5.00 mm and a cephalothorax measuring 1.75 mm in length and 2.30 mm in width. The female abdomen is 2.50 mm long and 1.45 mm wide. The male has a light yellow carapace with a translucent covering of scales, particularly brown scales on the posterior portion. The sternum, labium, and maxillae are yellow, while the chelicerae are yellow with dark longitudinal stripes. The abdomen is elongated and oval-shaped with a pale yellow background and darker ornamental patterns. The legs are yellow, with the first pair being particularly robust and bearing dark brown markings. Females are generally paler than males, with a light brown carapace and uniform yellow chelicerae and legs. The epigyne is weakly sclerotized with relatively straight insemination ducts and spherical spermathecae. The species can be distinguished from the closely related Phintella castriesiana by differences in the male's tibial apophysis structure, the thinner apical part of the tegulum, and distinct body coloration patterns.

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P. arenicolor is widely distributed across East Asia. It has been recorded from the Russian Far East, China, Korea, and Japan. In China, the species has been found in multiple provinces including Jilin, Zhejiang, Hubei, Hunan, Guangxi, Yunnan, Shaanxi, and Gansu. The species has also been reported from Romania, Russia, and Japan based on collection records.