Cell division in controversial fossils places them outside the animal kingdom
The oldest known "animal" fossils may have been living in the wrong kingdom. New images suggest that 570-million-year-old, many-celled blobs from China are not animal embryos as once thought, but rather some kind of spore-releasing cyst.
“They are not animals and they are not embryos,” says Stefan Bengtson, a paleobiologist at the Swedish Museum of Natural History in Stockholm. The work, done with colleagues including Philip Donoghue of the University of Bristol in England, appears in the Dec.