Nature School Game Contact Blog Project Noah Facebook Project Noah Twitter

A global citizen science platform
to discover, share and identify wildlife

Join Project Noah!
nature school apple icon

Nature School For Teachers - Fall 2020 Launch! visit nature school

Chinese Mitten Crab

Eriocheir sinensis


Mitten Crabs are one of very few crabs in North America found in freshwater. Adults and juveniles (>1 inch) have furry white-tipped claws that are equal in size. Their light brown to olive green body (carapace) is is 3 to 4 inches wide in adults, it's smooth and round and has a 4 lateral spines (behind each eye), although the forth spine may be small.There is a U-shaped notch in the carapace between the crab’s eyes. They have four sharp-tipped walking legs and a claw on each side, but lack a modified swimming leg or paddle. The legs are over twice the length of the carapace.


Freshwater and estuaries in California, Mid-Atlantic from Maryland to New York and its potential range includes coastal waters from Virginia to Texas, the Great Lakes, and US Gulf Coast.


For more information visit

Species ID Suggestions

Sign in to suggest organism ID


Aaron_G 8 years ago

Great spotting! I've moved this to Arthropods for you.

HeatherMiller 9 years ago

MonacaNoble, It seems like a natural match for Project Noah and the Smithsonian Environmental Research Center (and other groups like Nat. Geo.) to team up...especially where citizen scientists with their digital cameras and GPS cell phones can document sitings more so than "a picture dumping site with no details or identifications." This way the professional scientists have more than an unverified story to go on and can confirm reports.

Spotted by

Baltimore, Maryland, USA

Spotted on Jul 18, 2011
Submitted on Jul 18, 2011

Spotted for Mission

Related Spottings

Chinese mitten crab Chinese Mitten Crab

Nearby Spottings

Chinese Mitten Crab Gray Squirrel Eastern Redbud Grey Squirrel
Noah Guardians
Noah Sponsors