Nudibranch Bornella anguilla - Kenting (22-23May10) C 127.JPG
Kenting, Taiwan -- The nudibranch Bornella anguilla rearing its head over a sandy substrate.
Clearly depicted in this picture is the gray/black 'eye spot' of this nudibranch, just under the rhinophores. The 'eyes' of opisthobranchs are far less developed than the eyes of their mollusks relatives, the squid, octopus and cuttlefish.
In most cases the eyes only consist of a light-sensitive pigment spot that transmits stimulation to the brain via an unrefined optic nerve.
When disturbed this nudibranch can swim rapidly in an eel-like movement.