Pseudohaplolepis argentatum was named by Elliott (2018). Its type specimen is GLAHM 152854, a skeleton (slab of shale containing disarticulated specimen), and it is a 3D body fossil. Its type locality is Ardenrigg Colliery, pit number 6, Wester Bracco, which is in a Westphalian A fluvial-deltaic shale/coal in the Scottish Lower Coal Measures Formation of the United Kingdom. It is the type species of Pseudohaplolepis.