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Eousdryosaurus, new dryosaurid ornithopod from Late Jurassic of Portugal



Ben Creisler
bcreisler@gmail.com

In the new JVP:

Fernando Escaso, Francisco Ortega, Pedro Dantas, Elisabete Malafaia,
Bruno Silva, José M. Gasulla, Pedro Mocho, Iván Narváez & JosÉ L. Sanz
(2014)
A new dryosaurid ornithopod (Dinosauria, Ornithischia) from the Late
Jurassic of Portugal.
Journal of Vertebrate Paleontology 34(5): 1102-1112
DOI:10.1080/02724634.2014.849715
http://www.tandfonline.com/doi/full/10.1080/02724634.2014.849715#.VA8Hv_ldXTo




A new dryosaurid ornithopod, Eousdryosaurus nanohallucis, gen. et sp.
nov., is described here based on a single specimen from the Late
Jurassic Alcobaça Formation of Portugal. Eousdryosaurus nanohallucis
is distinguished from all other dryosaurids by eight autapomorphic
features and an unique combination of characters, some of which are
also shared by other dryosaurids. Eousdryosaurus is linked with
Dryosauridae, because the fourth trochanter is proximally placed and
widely separated from the scar for the insertion of the M.
caudifemoralis longus, which is restricted to the medial surface of
the femoral shaft. Phylogenetic analysis nests Eousdryosaurus in an
unresolved polytomy at the base of Dryosauridae together with
Callovosaurus, Dryosaurus, and Kangnasaurus. The complete pes of
Eousdryosaurus, which has a phalangeal formula of 1-3-4-5-0, supports
the putative autapomorphic reduction of the dryosaurid pes that also
occurs in parallel in more derived ornithopods.