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Stramonita haemastoma | by MarioQA
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Stramonita haemastoma

One of the largest molluscs of the Cantabrian intertidal (up to 8 cm). A predator on other molluscs, both bivalves and sea snails. Seems to favour warmer waters; it appears that its presence is increasing in the Cantabrian Sea (Bay of Biscay) in recent decades. It is known from shell deposits in prehistoric settlements, including the famous Altamira.

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Taken on June 9, 2017