Ctenochasmatoidea

Ctenochasmatoidea is a group of pterosaurs within the suborder Pterodactyloidea. It was defined by Unwin (2003) as the clade containing Cycnorhamphus suevicus, Pterodaustro guinazui, their most recent common ancestor, and all its descendants.[1] The earliest known ctenochasmatoid remains date to the Late Jurassic Kimmeridgian age. Previously, a fossil jaw recovered from the Middle Jurassic Stonesfield Slate formation in the United Kingdom, was considered the oldest known. This specimen supposedly represented a member of the family Ctenochasmatidae,[2] though further examination suggested it actually belonged to a teleosaurid stem-crocodilian instead of a pterosaur.

Classification
Below is a cladogram showing the results of a phylogenetic analysis presented by Andres, Clark & Xu, 2014.