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green crab

Green crab (Carcinus maenas) is the common name used in North America and South Africa for the European shore crab — an invasive species that has spread globally from its European Atlantic origins.

ˈɡɹin ˈkɹæb133 viewsLast reviewed Jun 29, 2026+ Add a definition
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#1·Apr 28, 2026

Green crab (Carcinus maenas) is the common name used in North America and South Africa for the European shore crab — an invasive species that has spread globally from its European Atlantic origins. In its native range it is often called simply the 'shore crab.' As an invasive species it is significant in ecology and fisheries management, damaging shellfish aquaculture and native ecosystems. The 'green' refers to the crab's typical colouring, though individuals vary considerably.

The green crab population in the estuary had exploded, and the clam beds were taking a hammering.
Origin: Named for the typical greenish colouration of Carcinus maenas; 'green crab' is the standard North American and South African common name for this species. Editorial expansion authored on Slangora.
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#2·Apr 27, 2026

(North America, South Africa) The shore crab.

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