Lazarus effect
n.— «To reappear after 11 million years is more exciting than if the rodent really had been a new species…Indeed, such reappearances are so rare that paleontologists dub them “the Lazarus effect.”» —“A rodent from the past” in D.C. Toronto Sun (Canada) Mar. 10, 2006. (source: Double-Tongued Dictionary)
Further reading
Is there a term for the need to sneeze when you step out into the sun? There are several, including the photic sneeze reflex, solar sneeze reflex, the Peroutka sneeze, and Autosomal Dominant Compelling Helio-Ophthalmic Outburst Syndrome, also known...
The term sun grin literally means a kind of squinting expression caused by facing bright sunlight. Metaphorically, though, it indicates a fixed or humorless grin. This is part of a complete episode. Transcript of “Sun Grin” Grant, I recently learned...