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Re: Hypsilophodon (again) and new 'raptor'
Simon M. Clabby wrote-
> And, just so there are no accusations of me being all
> take and no give, here is a report on a new, as yet
> unpublished dinosaur from the Isle of Wight.
Ornithodesmus cluniculus was the first named Wessex dromaeosaur. Jaime
defended this assignment quite well back in August-
http://www.cmnh.org/dinoarch/2003Aug/msg00177.html . Indeed, it can be
added that Ornithodesmus has other characters present in cooelurosaurs, but
not coelophysoids or ceratosaurs, such as sacral pleurocoels, and a ventral
midline groove on the posterior sacral centra.
I'll yet again make the point that the traditional
dromaeosaurine-velociraptorine split is not well supported, as detailed
here- http://www.cmnh.org/dinoarch/2003May/msg00427.html . We'll soon see
if the 'velociraptorine' Atrociraptor complicates this distribution.
Generally, teeth are assigned to the Velociraptorinae based on characters
primitive to dromaeosaurs, Nuthetes being a good example. Indeed, Nuthetes
doesn't even appear to be a dromaeosaur at all, unless Richardoestesia is
too (which is possible). See
http://www.cmnh.org/dinoarch/2003Jul/msg00333.html for more details.
Besides these taxa, there are teeth that resemble Sinornithosaurus and
Richardoestesia from the Middle Jurassic Chipping Norton Formation of
England (Metcalf et al., 1992).