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Dinosaur diversity (was Re: paleontologist, dinosaurs...)
George Olshevsky wrote:
> ... just hundreds and hundreds of
> garden-variety dinosaur genera missing from the fossil record. Among these
> are Jurassic marginocephalians,
_Chaoyangosaurus_ and a few others still in the _nomina nuda_ stage.
> Jurassic-Cretaceous thescelosaurids,
Got me there...
> sauropods intermediate between camarasaur-like and diplodocus-like forms,
..and here. Assuming these actually existed.
> Jurassic titanosaurs,
_Janenschia_ and possibly _"Apatosaurus" minimus_
> a host of spinosaurians and megalosaurs,
Spinosaurians, sure. Megalosaurs - I've got megalosaurs of one form
or another coming out of my ears.
> pre-_Alxasaurus_ segnosaurs,
If segnosaurs (therizinosauroids) are part of the great coelurosaur
radiation of the early Cretaceous, then pre-_Alxasaurus_ segnosaurs
may be very hard to find.
> Jurassic bullatosaurs,
_Koparion_, _Palaeopteryx_ - two highly dubious troodontids I must
confess. But there's rumour of a possible ornithomimosaur from the
Morrison (not _Elaphrosaurus_, now in the Ceratosauria).
> loads of Jurassic hypsilophodontians,
_Agilisaurus_, _Yandusaurus_, _Othnielia_, _Drinker_, ?_Nanosaurus_
> early Cretaceous tyrannosaurids,
_Siamotyrannus_. That _Tonouchisaurus_ I've heard so much (and so
> Gondwana dinosaurs of
> all kinds,
Here here to that!
> you name it. Not to mention about 50 million years of
> pre-_Archaeopteryx_ avians.