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> Can anyone suggest an example of a true reversal?
Mandibular dentition in one genus of marsupial tree frog. More debatably,
tabular bones in chrysochlorids (golden moles).
Incidentally, I read Chris Brochu's paper on archosaur systematics in the
_Journal of Paleontology_ last night. Excellent review, but, in the bit about
bird relationships, Chris says that no-one doubts the monophyly of Piciformes
(woodpeckers, barbets, toucans, honeyguides, jacamars) or Apodiformes
(swifts, swiftlets and hummingbirds). Though monophyly of these groups is
currently the consensus view, this is a little surprising: piciform monophyly
actually been quite controversial and formed the subject of various
argumentative papers by Olson, Cracraft and Raikow. Apodiform monophyly
has also been contested and some authors have separated hummingbirds (as the
Trochiliformes) from the other apodiforms. Anyway, back to work.
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