they are all strictly littoral, with the exception of a single Mediterranean species, which inhabits deep water and this has been found fossil in Sicily, whereas not one other species has hitherto been found in any tertiary formation: yet it is known that the genus Chthamalus existed during the Chalk period.
itsasertzekoak dira denak, zingo handiko uretan bizi den Mediterranioko espezie bat ezik, eta hau fosildurik aurkitu dute Sizilian, tertziarioko ezein formaziotan beste espezierik aurkitu ez den artean; hala ere badakigu Chthamalus generoa bizi izan zela kretazikoan.