1. Posterior of Goniodoris castanea. Body length 10 mm. a: pale brown anal papilla on white pigment mark at centre of gill circle. r: two ridges on posterior of body. On rocky shore exposed to strong currents, LWS, Menai Strait, Wales. April 2011.
2. Posterior of Goniodoris castanea. Body length 10 mm. a: pale brown anal papilla on white pigment mark at centre of gill circle. r: two ridges on posterior of body. On rocky shore exposed to strong currents, LWS, Menai Strait, Wales. April 2011.

Posterior of Goniodoris castanea. Body length 10 mm. a: pale brown anal papilla on white pigment mark at centre of gill circle. r: two ridges on posterior of body. On rocky shore exposed to strong currents, LWS, Menai Strait, Wales. April 2011.