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RE: Why Thulborn's ideas on dinosaur polyphyly are wrong
Mickey Mortimer wrote:
Based on the above, Thulborn finds the chance of sauropods and
ornithischians being secondarily > quadrupedal to be implausible, due to
the number of changes that would have to occur (e.g. enlarged pedal digit I
in sauropodomorphs, redevelopment of pedal digit V in sauropods,
Although associated with quadrupedality, these characters are more broadly
correlated with a shift in the distribution of body weight.
Therizinosauroids show similar changes in pedal morphology, even though they
remained strict bipeds.
Many birds also show an "enlarged pedal digit I", but in this case this
character is associated with arboreality (perching).
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