Parviraptoridae

Parviraptoridae is an extinct family of enigmatic total group squamate reptiles, known from the Middle Jurassic to Early Cretaceous of Europe and North America. Members of this clade are characterized by an unusual set of conflicting anatomical traits that are comparable in some ways to snakes and varanids within the Toxicofera, while also bearing several characters unlike all modern squamate groups.

Classification

Using different datasets and constraints, Benson and colleagues found three potential placements for Parviraptoridae within the Lepidosauria : either in a basal position in the squamate stem group, or within the derived clade Toxicofera, as an independent branch or part of the snake stem group. These alternate placements are summarized in the simplified cladogram below: