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Re: *Mauisaurus* vs large pterosaurs

2009/10/7 don ohmes <d_ohmes@yahoo.com>:

Just one thing:

> Note that the largest pterosaurs and the largest elasmosaurs co-existed, and 
> a 'first-glance' seems to show a size correlation between the animals through 
> time.
Whatever the reason for Cope's Rule (and if it generally holds true),
may it not be that the latest members of both lineages, that
extinguished at the same time, where the largest because of Cope's
Rule and not because of some coevolutionary linkage? After all, in the
latest Cretaceous you also have the largest of other clades, such as
tyrannosaurids and ceratopsians (whose evolution may in principle seem
as possibly also coevolutionarily correlated).

In any case, coevolutionary correlation in these cases may be tested
with the comparative method...