1. Goniodoris castanea. Five specimens and spawn on Botrylloides violaceus. Upper left; dark form. Upper right; form with orange matching the B. violaceus. August 2011. Sublittoral. Oosterschelde estuary, Netherlands.
2. Goniodoris castanea. Five specimens and spawn on Botrylloides violaceus. Upper left; dark form. Upper right; form with orange matching the B. violaceus. August 2011. Sublittoral. Oosterschelde estuary, Netherlands.

Goniodoris castanea. Five specimens and spawn on Botrylloides violaceus. Upper left; dark form. Upper right; form with orange matching the B. violaceus. August 2011. Sublittoral. Oosterschelde estuary, Netherlands.