The Arctic surf clam, Mactromeris polynyma, is recorded from strata of Late Pliocene (Reuverian) age in the North Sea Basin for the first time; this species represents a Pacific invader which became extinct in Europe, but survived to the present day along the eastern American coast.

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Cainozoic research

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Peter W. Moerdijk. (2002). Mactromeris polynyma (Stimpson, 1860) (Mollusca, Mactridae) from the Upper Pliocene of the Netherlands and Belgium. Cainozoic research, 2(1/2), 135–137.