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Hemigrapsus sanguineus
One of many crabs I found crawling around the rocks. I found a couple colorful ones such as this one
Rocky seashore at low tide
Spotted on Apr 21, 2016
Submitted on May 17, 2016
2 Comments
http://vitalsignsme.org/sites/default/fi...
It sure does look like a shore crab, they mostly have square bodies. Maine is known for the green shore crab. OTOH, there's also an Asian shore crab that is now considered an invasive species, so you might want to check that out also.
http://greennature.com/article16.html