[1] A second species, Parviraptor gilmorei, was described from the Late Jurassic Morrison Formation of Western North America;[2] it was present in stratigraphic zone 4.

[1] An indeterminate species is known from the Bathonian aged Kirtlington Mammal Bed (Kilmaluag Formation, Scotland).

Parviraptor was initially described by Susan E. Evans in 1994, based on disarticulated but associated remains including bones of the skull and vertebrae.

[1] However, Susan E. Evans, the original describer of the genus, has stated that subsequent study of the other remains attributed to the genus indicates that they can confidently assigned to Parviraptor, and are dissimilar to the skeletons of snakes, making its affinity to them doubtful.

[5] Cladogram based in the phylogenetic analysis by Caldwell et al. (2015):[1] Portugalophis Parviraptor Eophis Unnamed sp.