Photograph taken by John McLaughlin taken in Koh Tao, Thailand
Comment from the photographer: Approx 6cm long at 17m depth.
The gills were arranged in a distinct counter-clockwise spiral and undulated vigorously (pics and video available).
Similar to C albopunctata except there are no white rings and the mantle and margin pattern is repeated on the foot. Also note the large bump behind the rhinophores.