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Re: Were dinosaur ecosystems continent-sized? (resend)
GSP1954@aol.com a écrit :
All the late Maastrichtian edmontosaurs are growth stages of E. annectens,
with copei being the mature stage with long shovel grazing beaks that do not
exist in specimens of 2 tonnes or less. Earlier E. regalis grew to the same
final size of 3 tonnes, but the beak never elongates or squares off. The
only major difference in the two taxa is the beak so Anatosaurus is a doubtful
Do you mean 'genus', or 'species' ?
A genus IS doubtful if its type species is doubtful. If not, the genus
MAY be considered as doubtful, and the type-species reallocated to
another, close genus. The decision is up to the taxonomist, in this case.
Here is a summary of what you just said, considering each genus and type
*Anatosaurus annectens* = *Anatotitan copei*
*Edmontosaurus regalis* =/= *Anatosaurus annectens*
Hence: *Anatosaurus annectens* = *Anatotitan copei* =/= *Edmontosaurus
Keeping *Edmontosaurus annectens* and *Anatosaurus annectens* as two
valid (here taxonomically speaking) genera does not shok me, nor sinking
*Anatosaurus* into *Edmontosaurus* (oops, I'm not too sure about this
part of the sentence... Damn Frenglish !!). And, as I suppose you're
also a cladist, you just have to be define your genera in a way that
they are monophyletic. You could also sink the whole dinosauria into the
same genus that it would not shock me. Well, it would a complete mess
afterwards for bird and other dinos friends, but as long as the taxon is
It is interesting that a *hardosaur* clade was getting big into grazing when
that dang asteroid simply ruined things.
A *hardosaur* ? I don't even want to know why such a name was erected...