Lancing Nature

Widewater Lagoon     Local Nature Reserve   (TQ 196 041)
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The Lagoon Cockle
Cerastoderma glaucum
9 July 2002 
Live small cockles (new recruits of a breeding population) have now been discovered at depths of 20 cm in Widewater, which was about a metre deep near the bridge. This is the Lagoon Cockle, Cerastoderma glaucum, although when the cockles are small (12 mm width) they do not have the shape of the full grown ones, so they initially looked to me like Common Cockles, Cerastoderma edule. Actually, whilst they are alive there does not seem to be an easy way to distinguish them as it is the interior groove differences that are diagnostic. The shell is thinner and the Lagoon Cockle is brittler and the live shell can be easily prised open with a fingernail which is much harder with the Common Cockle, even small ones. The Shore Crab, Carcinus maenas, would find these shells very easy to crack open.  
BMLSS Cockles

The aquatic life of Widewater lagoon is covered in detail on
Andy Horton's Widewater Lagoon page

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Copyright : İRay Hamblett 2006

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