South-west Indian Ocean Seaslug site
We use Worms classification

(World register of Marine species)

With lines	With large spots	With small spots	With large tubercles	With reticulate pattern	With cerata or papillae	With external shell	Others

Remark :

Some nudibranchs can have multiple classification criteria, such as lines and small dots ... In this case looking into the two relevant pages ... Good luck...