Fried-egg Nudibranch (Phyllidia varicosa) タテヒダイボウミウシ – size 11cm
There are several similar species to this, so I am not quite sure on all of these. I was filming a cuttlefish swimming, and it swam over this. Amami 2024
Another Fried-egg Nudibranch. They are large have longitudinal rides and black lines breaking the edges. Most of the bumps are capped with yellow. Amami 2019
Another Fried-egg Nudibranch. Amami 2025