Although similar to the related Phintella lucida, the copulatory organs are distinctive, particular the tip of the spike on the tibia, the tibial apophysis.

Phintella brevis is a species of jumping spider, a member of the family Salticidae that was first described in 2022 by Wanda Wesołowska and Anthony Russell-Smith.

[6] There are similarities between spiders within genus Phintella and those in Chira, Chrysilla, Euophrys, Icius, Jotus and Telamonia.

[7] Genetic analysis confirms that it is related to the genera Helvetia and Menemerus and is classified in the tribe Chrysillini, named after the genus Chrysilla.

[8][9] In 2017, Jerzy Prószyński grouped the genus with 32 other genera of jumping spiders under the name Chrysillines in the supergroup Chrysilloida.

[13] It has similar colouring to the related Phintella lucida but can be distinguished by the shape of the end of the tibial apophysis.