A Small and Spiky Nudibranch

Occurred on May 21, 2023 / Lembeh, Sulawesi, Indonesia

Info from Licensor: "Tiny little beautiful nudibranch, Costasiella sp. Very beautiful and amazing in its natural creativity. It is often found on certain types of seaweed in the sand. It is very small and difficult to photograph. But I love this beautiful nudibranch."