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The spiny cockle can be difficult to distinguish from the prickly cockle, but a key identification feature is that in the left valve, the anterior cardinal tooth is larger than the posterior. It has 20 - 22 ribs and feels slightly heavier than a similar sized prickly cockle. The spines - if not worn down - are sharp and more pronounced than the prickly cockle.
Found at Paignton Sands.