Gosh, yet another transitional form that creationists always tell us don't exist!
From Tetrapod Zoology:
Image above shows Darwinopterus predating on small maniraptoran theropod
Pterosaurs - the charismatic flying archosaurs of the Mesozoic Era - fall fairly nearly into two great assemblages: the primitive, mostly long-tailed basal forms (or 'rhamphorhynchoids') and the more strongly modified, consistently short-tailed pterodactyloids...
A list of anatomical characters show that pterodactyloids are most closely related to the rhamphorhynchids (Kellner 2003, Unwin 2003) - a group of Jurassic non-pterodactyloid pterosaurs that have a relatively low number of needle-like teeth and are best known for Rhamphorhynchus from the German Solnhofen Limestone. While intermediates between rhamphorhynchids and pterodactyloids are hypothesised to have existed, they have remained unknown. Until now.
Today see the publication of a remarkable new kind of pterosaur that bridges the gap between non-pterodactyloids and pterodactyloids, and it exhibits a surprising melange of characters. Named Darwinopterus modularis Lü et al., 2009, it's from the Tiaojishan Formation of Liaoning Province, China.
Follow link above for the full article.