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Archosaurs of a feather

The current Science (3/9/01) has an interesting letter from Richard Prum on 
"_Longisquama_ Fossil and Feather Morphology."  (He says that the appendages 
are not feathers for a variety of reasons.)  Dave Unwin and Michael Benton 
continue in the same "vane" in a separate letter rejecting the Jones et al. 
conclusions.  Jones et al. respond that yes, they are feathers and yes, it is 
an archosaur.