400-yr-old clam:

[Ninong]

Arctica islandica clam collected from the frigid waters off Iceland's north coast has been hailed as the longest-lived animal ever discovered.

Here.

[Poseidon]

I like the part where it WAS ALIVE when they brought it to the surface, but it is DEAD now!!! 400 YEARS this clam was minding his own business..... then BLAM! Taken to the surface to die.