USS Ouroboros

The USS Ouroboros was a Federation starship, a tier 6 temporal raider prototype in Starfleet service in the 31st century and 2410s decade. 

Service history
When the Alpha Quadrant Alliance become involved in the 2410 front of the Temporal Cold War, the USS Ouroboros and some of its sister ships became active in that time period. They remained following the temporary closure of the front. 

Background

 * The Ouroboros is available to Star Trek Online players in the Admiralty System mini-game.