Longisquama insignis, based on a skeletal reconstruction published by Dave Peters in 2004. I don't think that this insanely elaborate reconstruction is in the least bit accurate.

This is an annoying teaser for the very long article due to appear here soon: an attempt to counteract the massive web presence of the wholly misleading, mis-educational ReptileEvolution.com. And, no, Longisquama did not really look like this... alas, Dave Peters tells us that it did [the drawing shown here - produced by me - is based on a skeletal reconstruction of Longisquama that Dave published in 2004]. More soon.