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The biggest shell in the world

The biggest shell in the world

    The giant tridacne or giant giant clam (Tridacna gigas) is the largest known bivalve mollusk. This edible species is protected because it is in danger of extinction.




    The main remarkable characteristic of this species is its size, capable in some cases of containing a human being. Smaller specimens are however often difficult to distinguish from other species of giant clams. They are nevertheless distinguished by several features: the asymmetrical shell in lateral view, has 4 or 5 ribs well pronounced and without slender scales, the closure is very ill-adjusted (the animal almost never closes completely), the opening is very small, and the inhalant siphon does not is not equipped with tentacles. The coat is extremely variable, sometimes very colorful but often dull, sometimes going far beyond the shell or sometimes confined. This species being the most famous of the genus, its name is often wrongly assigned to all the giant clams.


    It is the largest shell in the world: its shell can measure 1.5 m and weigh 250 kg. It does not have a concentric design (scale). They owe their name to holy water font to their traditional use in Catholic churches to contain holy water at front doors.

    
    
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