Tmesiphantes aridai is a species of tarantula in the family Theraphosidae, subfamily Theraphosinae.

[2] The type locality is Floresta Nacional do Tapajós, Santarém, in the state of Pará, Brazil.

[3] The species was first described by Hector Gonzalez-Filho, Antonio Brescovit and Sylvia Lucas in 2014.

[1] The specific name aridai honors Filepe Arida, the grandson of one of the describers.

[3] The male is distinguished from other species by an inconspicuous basal tegular projection on the palps and a tibial apophysis (i.e. a projection) with two similarly sized branches, and the retrolateral one is large and has an apical spine.