Burgess Shale fossils from B.C. A smaller Burgessomedusa phasmiformis jellyfish is preserved above a larger specimen in this photo taken at the Burgess Shale fossil site in B.C. Tentacles can be seen on the left side of the larger specimen and the right side of the smaller. "This may have been a pretty aggressive predatory species of jellyfish," said Moysiuk, who worked on the study with two other colleagues, Justin Moon and Jean-Bernard Caron. Its bell was fringed with more than 90 tentacles, resembling those of the harmless moon jellyfish.
