"feeserpeton" was included in a phylogenetic analysis when it was first named in 2012. it nested within the clade lanthanosuchoidea, a poorly known group that includes the parareptiles "acleistorhinus" and "lanthanosuchus". "feeserpeton" was found to be a basal member of this group, the sister taxon of a clade including "acleistorhinus" and "lanthanosuchus". features that place "feeserpeton" within lanthanosuchoidea include a ridge on the frontal bone above the eye socket, a plate-like supraoccipital bone with a sagittal crest on the braincase, and a notch midway along the margin of the back of the skull. "feeserpeton" is the oldest member of the clade. below is a cladogram from the analysis showing the position of "feeserpeton":