Search the Community
Showing results for tags 'iguanodontia'.
Found 2 results
-
Everyone is familiar with Dryosaurus, Iguanodon, Ouranosaurus, and Camptosaurus, but work by David Norman, Dave Weishampel, Peter Galton, and a few other dinosaurologists have helped reconstruct the early evolution of Iguanodontia, finding Rhabdodontidae the most primitive iguanodonts and grouping dryosaurids with more advanced iguanodonts in Dryomorpha, while applying the name Ankylopollexia to the clade formed by basal iguanodonts more derived than Dryosauridae. Therefore, I thought it would be appropriate to ask what your favorite primitive iguanodont is.
-
Although Callovosaurus is now securely identified as the oldest dryosaurid, the confirmation of the dryosaurid classification of Callovosaurus by iguanodont guru Andy McDonald creates a ghost lineage for other groups of non-ankylopollexian iguanodonts, including the rhabdodonts (for which there are no Jurassic representatives yet). Since the Jurassic form Yandusaurus is recovered as a non-iguanodont ornithopod by Butler et. al. (2008), and Othnielosaurus, Agilisaurus, and Hexinlusaurus are recovered outside Cerapoda, is it possible that the lack of any Jurassic rhabdodontids is an artifact of sampling (considering that knowledge of Middle Jurassic ornithopods is still in its infancy)? The important thing to note is that Callovosaurus was fossilized in an island environment surrounded by ocean, and most other Middle Jurassic neornithischians are known from China and Argentina.
