One of the mysteries of the English language finally explained.
A burrowing marine bivalve mollusc with a thin smooth shell.
Family Mactridae: Spisula and other genera
- ‘High levels of chromium, mercury, lead and zinc in trough shell Spisula subtruncata from dredge dumping site Oostende could be ascribed to the dredge dumping activities.’
- ‘Other bivalves you are likely to see are: tellin, mussel, razor, trough shell, and sand gapers.’
- ‘Fauna and fauna include live cockles, trough shells, carpet shells and tellins.’
- ‘Mactridae, also known as surf or trough shells or duck clams, is a family of marine bivalve clams of the order Veneroida.’
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