Smallest flying vertebrate?

["Patrick Norton" <ptnorton@msn.com>]

Forgive me for one more pterosaur query.  In reconstructing the pterosaur, 
Normannognathus wellnhoferi, I became convinced it probably was not the 
smallest pterosaur, as some claim, since it probably was at least a third 
larger than Pterodactylus elegans (wingspan of 25 cm).  This tweaked my 
interest in the question of how small pterosaurs could be and still engage 
in flapping flight. I've read statements claiming that the smallest known 
flying vertebrate is a pterosaur, but I can't find a reference to the 
specimen(s) behind that claim. Given that the bee humingbird is only 6 to 8 
cm long (and half of that is beak) this must have been an incredibly small 
pterosaur. Does anyone have a name or ref for that pterosaur?

PTN

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