A New Stalked Filter-Feeder from the Middle Cambrian Burgess Shale, British Columbia, Canada. 2012. L. J. O'Brien and J.-B. Caron. PLoS ONE 7(1): e29233.
This is a new member of the "Problematica," those strange Cambrian animals not assigned to any known phylum. And because it's published in PLoS ONE, the entire article (including many beautiful photos of fossils and some ecological notes) is freely-available on line. What a treat! Via Paleoblog.