Chromodoris annae or C. westraliensis? from Exmouth

Dear Bruce,
This certainly has the general look of C. annae, but in that species the orange border is submarginal, while the actual mantle edge is white. There is also a white band inside the orange band as well. In your animal the orange border reaches right to the edge and there is a blue band inside separating the outer orange and inner black lines. In this case your animal is C. westraliensis. This specimen is unusual because it lacks the black patch in the middle of the mantle.

Best wishes,
Bill Rudman