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 The toad crab, Hyas coarctatus, is a 'true crab' and therby has a heavily calcified, flattened carapace with a short abdomen folded up beneath it. The first appendages form large claws. It is a member of the spider crab family and has long, thin legs, and claws of the same length as the legs. Its stalked eyes are visible from above. Hyas coarctatus can reach up to 61 mm in carapace length and is reddish-brown above and white underneath. It has longer claws than the giant spider crab, Hyas araneus, and the two forward-projecting horns on its head are slightly longer and further apart than those of the giant spider crab.


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©  The Marine Biological Association of the United Kingdom

Source: Marine Life Information Network

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