Tim Williams wrote- "If _Changmiania_ is a fossorial/burrowing ornithopod, then it suggests this behavior is primitive for Ornithopoda; this is because the next outgroup (Orodrominae) also comprises fossorial burrowers (as the paper makes clear)."
Not necessarily. It takes the same number of steps if Changmiania and orodromids (shouldn't that family have been called Orodromeidae?) evolve burrowing convergently (2 steps) than if their common ancestor evolves it then other ornithopods reverse it
(2 steps).
"Parksosaurinae should be Hypsilophodontidae, because it includes _Hypsilophodon_. There is already a family Hypsilophodontidae available, and has been for donkey's years (it goes back to Dollo, 1882)."
And Iguanodontia needs to be defined with Iguanodon bernissartensis as an internal specifier instead of as "all ornithopods more closely related to Parasaurolophus walkeri than to Hypsilophodon foxii or Thescelosaurus neglectus" (Phylocode Article 11.10).
Mickey Mortimer
On Wed, Sep 9, 2020 at 12:59 AM Ben Creisler <bcreisler@gmail.com> wrote:
|