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Philidor11 wrote...

> 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.

Darren Naish
School of Earth & Environmental Sciences
University of Portsmouth
Burnaby Building
Burnaby Road                           email: darren.naish@port.ac.uk
Portsmouth UK                          tel: 023 92846045                   
PO1 3QL                                www.palaeobiology.co.uk