Pancake Nudibranchs (Aphelodoris varia... I think) are often quite big, compared to other Nudibranchs. This one was found whilst diving on a cold winters morning in Kurnell, Australia.
Nikon D850, Nikon 60mm Macro, Aqautica water housing
1/160, F20, ISO 160
[IMAGE: https://cdn.steemitimages.com/DQmbv4tisHTY7j7wfWMiaqRbm9ByR3Tq6FMbHMGCcKu29FU/_DSC2953.jpg]