Lovely Headshield Slug (Chelidonura amoena) コナユキツバメガイ
Lovely Headshield Slugs are a type of Headshield Slug. They are carnivorous and eat worms and other creatures living in the sand. There are three of them in this picture. Amami 2024
Here the same ones are forming a circle. Since they are hermaphrodites, they can give and receive at the same time. Amami 2024