Siphusauctum

Over a century after its initial discovery, the Burgess Shale continues to be a treasure trove of bizarre Cambrian fossils, most recently this tulip-shaped creature:

Reconstruction by Marianne Collins

“Most interesting is that this feeding system appears to be unique among animals. Recent advances have linked many bizarre Burgess Shale animals as primitive members of many animal groups that are found today, but Siphusauctum defies this trend.  We do not know where it fits in relation to other organisms,” said lead author O’Brien.

Via Life Before the Dinosaurs.