The carapace of Liocarcinus corrugatus reaches up to 43 mm in length and 41 mm in breadth. It is a reddish-brown in colour, sometimes with red or yellow patches. The carapace has numerous distinctive transverse ridges giving a 'corrugated' appearance. There are 5 prominent antero-lateral teeth on each side of the carapace and the margin of the frontal region has a shallow median lobe and a pair of very broad concave sub-median lobes.
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