Dryosauridae

Not to be confused with Dyrosauridae

Dryosaurids Temporal range: Middle Jurassic – Late Cretaceous, 163–80 Ma PreЄ Є O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Order:	†Ornithischia
Suborder:	†Ornithopoda
Clade:	†Dryomorpha
Superfamily:	†Dryosauroidea Milner & Norman, 1984
Family:	†Dryosauridae Milner & Norman, 1984
Subgroups
Eousdryosaurus Callovosaurus Dryosaurus Dysalotosaurus Elrhazosaurus Kangnasaurus Valdosaurus

Dryosaurids were primitive iguanodonts. They are known from Middle Jurassic to Early Cretaceous rocks of Africa, Europe, and North America.

Phylogeny

Until recently many dryosaurids have been regarded as dubious (Callovosaurus and Kangnasaurus) or as species of the type member, Dryosaurus (Dysalotosaurus, Elrhazosaurus and Valdosaurus). However, more recent studies redescribe these genera as valid. The cladogram below follows Paul M. Barrett, Richard J. Butler, Richard J. Twitchett and Stephen Hutt (2011).

	Rhabdodontidae Muttaburrasaurus Rhabdodon Zalmoxes Tenontosaurus Dryomorpha Ankylopollexia Dryosauridae Callovosaurus Kangnasaurus Dryosaurus Dysalotosaurus Valdosaurus Elrhazosaurus

According to an abstract at the SVP 2014 conference, Anabisetia, Macrogryphosaurus, and Trinisaura, all from the Late Cretaceous of Gondwana, are members of Dryosauridae. If so, then Elasmaria would be a derived clade of Cretaceous dryosaurids.

History