Eousdryosaurus nanohallucis, a new dryosaurid from Portugal, was announced one or two days ago. The Alcobaca Formation, where Eousdryosaurus hails from, is relatively close to the Lourinha Formation, so I’m guessing that’s another addition to Dinosaur Revolution. It’s much like any other dryosaurid, but it differs from Dryosaurus in particular by its gracile morphology and a derived foot structure (hence the species name nanohallucis). 

The PalaeoFellows decided to celebrate this discovery by doing a restoration of our own from what material was shown in the paper. Here’s our reconstruction (bottom) side by side with the official press release image, presumably a Raul Martin piece.

Credit goes to Randall Munroe for his color survey, which was very useful for last-minute coloration.

The Oak lizard, Dryosaurus (1878)

Phylum : Chordata
Class : Reptilia
Order : Ornithischia
Superfamily : Dryosauroidea
Family : Dryosauridae
Genus : Dryosaurus
Species : D. altus

  • Late Jurassic (155 - 145 Ma)
  • 4 m long and 90 kg (size)
  • North America and Africa (map)

Dryosaurus had a long neck, long, slender legs and a long, stiff tail. Its arms, however, with five fingers on each hand, were short. Known specimens were about 2.4 to 4.3 m long and weighed 77 to 91 kg. However, the adult size is unknown, as no known adult specimens of the genus have been found.

Dryosaurus had a horny beak and cheek teeth and, like other ornithopods, was a herbivore. Some scientists suggest that it had cheek-like structures to prevent the loss of food while the animal processed it in the mouth.

A quick and agile runner with strong legs, Dryosaurus used its stiff tail as a counterbalance. It probably relied on its speed as a main defense against carnivorous dinosaurs.

The teeth of Dryosaurus were, according to museum curator John Foster, characterized by “a strong median ridge on the lateral surface.”Dryosaurus subsisted primarily on low growing vegetation in ancient floodplains.

A Dryosaurus hatchling found at Dinosaur National Monument in Utah confirmed that Dryosaurus followed similar patterns of craniofacial development to other vertebrates; the eyes were proportionally large while young and the muzzle proportionally short. As the animal grew, its eyes became proportionally smaller and its snout proportionally longer.

Watch on fuckyeahkawaiidinos.tumblr.com

I’m a Dinosaur - Dryosaurus