Maltawildplants.com is now considered an online flora of the Maltese islands, portraying more than 900 species of plants found in Maltese habitats. It harbours a forum created in 2005 were memberes discuss topics about the Maltese flora and ID of plants.
seems to be our endemic Trochoidea spratti, which is found in various forms from flat to that shape and in various colours! It is so variable that in the past, around 20 different species were described!