 Direct evidence for plant-eating is known in a specimen of "Sinopterus" that preserves seeds in the abdominal cavity.The Barremian-
Aptian distribution of some tapejarids may even be partially associated with the first radiation phase of the angiosperms, especially of the genus Klitzschophyllites which represents a more basal angiosperm.Tapejaridae was defined by Alexander Kellner in 1989 as the clade containing both "Tapejara" and "Tupuxuara", plus all descendants of their most recent common ancestor.