Triton (TOS)

For information on a Re-imagined battlestar of the same name, see Triton (RDM).

The battlestar fleet at Cimtar (credit: Universal / ABC)

Though not specifically seen on screen, the battlestar Triton is mentioned when the Cylons attack the fleet at Cimtar (Saga of a Star World).

It's likely Acropolis and Pacifica are the other unnamed battlestars seen with the Atlantia and Galactica at Cimtar.