Invasive SpeciesGreen crab

Carcinus maenas
FOUND by Bfedrizzi
ID Confirmed
Quality checked by David Fedrizzi
Peer reviewed by Liam Fedrizzi
Field Notes
5 to sox green crabs found in 20 minutes. It was a spur of the momment search. We were playing with hermit crabs when we fpund the first. I then looked up an ID card because it was suspicious looking. My suspicions seemed correct as there five spines by each eye and it was pentagon shaped. All the ones we found were green. I don't have a sketch but I do have a photo.
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
Pentagon shaped shell
Photo of my evidence.
5 spines on each side of the eye
Photo of my evidence.
Sharp pointy claw
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Carcinus maenas
Common name:
Green crab
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
N 44.466932 °
W -68.897575 °
Observation Site Information
A photo of our study site.
Coastal - Rocky intertidal
Trip Information
Searsport Shores Campground
Trip date: 
Wed, 2017-08-09 15:10
Town or city: 
Type of investigation: 
Species Survey
Time of low tide: 
Wed, 2017-08-09 18:49


Some of the pictures are inconclusive, but the evidence you provide (5 spines, pentagon shell) and the first picture under "supporting evidence" are convincing that it's a green crab. Well done!