'Kebab rat does a Lazarus'

A rodent first found for sale in a Laotian kebab stall is the sole surviving species of a group thought extinct for 11 million years AND NOT the first known member of a new order of living mammals as initially held.
Lazarus effect: when an organism turns up after a long gap in fossil records.
(Paraphrased but curtsy: New Scientist, 60 seconds section - March 2006)