[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Meet Protopteryx: two Yixian maniraptorans in one week!
(i) elongation of scales
Isn't it funny that in the recent "refutation" of Longisumata (sic) that
what's described in (i) above was laughed off has having nothing whatsoever
to do with the evolution of feathers!<<<
And it should be laughed off this time. On purely developmental
grounds it would be almost impossible. While simple perforations are
obviously possible through variation in low-level genetics (e.g.
fenestration), highly repetative structures are the result of duplicated
controller genes, after which selection on heterochronistic variation
provides the refined struture. Proximally branched dinofuzz (if Currie's
description holds up to SEM or other fine morphological analysis) would be
the ideal forunner to the genetic evolution of avian feathers.
Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com