Click the thumbnail photos to enhance!
Species of the family Ovulidae Fleming, 1822 are sometimes mistaken for seaslugs, especially when the shell is covered by the large colourful mantle. Let me quote Bill Rudman:
"One easy way to separate snails from slugs is to look for their eyes. If they are raised from the skin like this then they are a snail. If the eyes are embedded in the skin they are an opisthobranch."
How to cite:
Köhler, E. (2017), published 7 September 2017, Hiatavolva rugosa (Cate & Azuma in Cate, 1973)
available from https://www.Philippine-Sea-Slugs.com/Look-alike/Ovulidae/Hiatavolva_rugosa/Hiatavolva_rugosa.htm