Mitten crabs are large crustaceans. River Thames specimens often have a carapace width over 84mm.
The features that facilitate Eriocheir sinensis identification include:
The carapace of Eriocheir sinensis is quadrate (squarish).
The frontal margin between the eyes has a central cleft and four spines.
The antrolateral lateral carapace margin has four teeth.
Left chela of a male mitten crab. Dense setal mats (mittens) completely surround the claw.
Adult males have a narrow, V-shaped abdomen.
Adult females have a broad, U-shaped abdomen to protect their eggs.
Watch the Museum's crustacean expert, Paul Clark, demonstrate the features that distinguish mitten crabs and see how crabs can be identified as male or female.
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