The species was first described in 2020 by Franklyn Cala-Riquelme, Abel Bustamante, Sarah Crews and Bruce Cutler.

The spider is dark reddish in colour, and lacks a distinctive pattern on either the abdomen or carapace.

The chelicerae are also reddish and have a distinctive concave central section which helps to distinguish the species from others in the genus.

Other distinguishing characteristics for the species include the very long thin embolus of the male and the wide spermathecae in the female.

Peckhamia wesolowskae is a jumping spider [species]] that was first described by Franklyn Cala-Riquelme, Abel Bustamante, Sarah Crews and Bruce Cutler in 2020.

[6] The genus Peckhamia is related to Synageles, with some species transferred between the two due to the similarities between the genera.

The palpal bulb has a wide dark retrolateral tibial apophysis and very long thin embolus.

[11] Similarly, the concave shape of the chelicerae make the spider easy to tell from the related Peckhamia areito.

[13] Peckhamia wesolowskae resembles ants of the Cephalotes genus, particularly the size and shape of their heads.