Oraapi

From Tardis Wiki, the free Doctor Who reference

The Oraapi were a race of parasitic carrion eaters. They used some type of natural slime to preserve food for later, which was similar to the Darkness' secretions. The Fourth Doctor knew of them. (PROSE: The Well-Mannered War)

Though their time period and planet of origin is unknown, they must have evolved before 10,000,000.