Some shells have the right to tell you just how old the mollusc inside had actually been alive, for example. Common cockles are several of the finest shells to watch this on - so these space pictured here.
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While cockles have actually ridges running from their narrowest point, to your widest, that is occasionally also feasible to see indented present running across the width of the shell (and these space replicated precisely on each fifty percent of the shell).
The theory is that each line throughout represents one growing season, rather like the expansion rings that tree trunks.
READ MORE:How to identify shells
The two deep lines across the shell over indicate the the cockle lived throughtwo birthdays but dies before the third.
Rings might be a far better indication of period than the dimension of the shell, together the above photo shows. A bigger shell does no neceassarily typical that the molusc lived a much longer life.
While the shells above are an extremely different sizes, the growth ring argues that they are both roughly the same age - somewhere between one and two years old. Maybe the bigger shell on the right resided in an area where an ext food was accessible enabling it to thrive bigger.
To be scientificallyaccurate, the best way to age a covering would be to saw v itto get a overcome section and also look in ~ the internal development rings.This is, however, a an extremely tricky operation requiring professional equipment.
The 2 shells below show much less clear development rings as do numerous shells. In some shells, the rings acquire worn away in the water, for example.
More around cockles and other bi-valve shells
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