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  Topic: Discussing "Explore Evolution", Have at it.< Next Oldest | Next Newest >  
afarensis



Posts: 1005
Joined: Dec. 2006

(Permalink) Posted: July 18 2007,19:37   

Quote (Paul Nelson @ July 18 2007,07:37)
Funny thing about the reptile-mammal illustration comparison, which Afarensis and other find puzzling and irrelevant.  Several people who did not know that the fossils were being scaled (without their knowledge), to make the morphological transition appear smoother, have told me they regard this practice as objectionable.

Why weren't we shown just how different in size these groups were? they ask.

Sigh. No Paul, this is completely wrong. The morphology that was transitioning was not based on size so "smoothing" the scaling to make them look similar is irrelevant. To give an example, in pelycosaurs the occipital condyle is single and hemispheric shaped. It evolves into a double condyle in mammals and an intermediate stage is seen in therapsids. None of this has anything to do with size. The mammal condyle is not just an allometrically scaled version of the pelycosaur. So explain how  
Quote
...fossils were being scaled (without their knowledge), to make the morphological transition appear smoother...
is a relevant criticism of this particular transition or of transitional sequences in general?

--------------
Church burning ebola boy

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  859 replies since July 13 2007,13:04 < Next Oldest | Next Newest >  

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