Bulla striata -
Kerkena -This species, very sensitive to pollution, prefers the Posidonia fields in shallow waters.
Tricolia speciosa
This tiny herbivorous gastropod (14 mm in length ) lives on the leaves of Posidonia to eat small algae which are growing on. This beautiful shell from Jerba island is very sensitive to pollution.
Gibbula ardens
This gastropod
(16 mm in diameter ) lives in shallow waters among
Zostera fields. This beautiful shell from the southern
Bibans lagoon is very sensitive to pollution.
Photos: J. Zaouali