Invasive SpeciesAsian shore crab

Hemigrapsus sanguineus
ID Confirmed
Quality checked by Go Science
Peer reviewed by colorful crabs
Field Notes
When we arrived at Reid State Park at 9:15 on October 24, 2017 I looked around and saw my teammates and the seaweed covered rocks that are everywhere. We are near a sort of river going from a lagoon into the open ocean. There is a road and a bridge going over the river. On the other side of the river, there are rocks with less seaweed, and a lot of trees. I hear the river and the waves crashing on the beach around the corner, it is windy and I can hear the wind rustling the trees. I smell the salty sea breeze. We searched for Asian shore crabs in a quadrant and I am surprised that we didn't find any Asian shore crabs because they are invasive and there are supposed to be a lot of them. We had a hard time taking pictures of the crabs in our quadrant because most of them were very small. I am happy that we learned a lot about crabs, and had a lot of fun looking for the different types of crabs in the seaweed and under rocks.
Supporting Evidence
Photo of my evidence.
Five spines, not three, therefore it is a green crab.
Photo of my evidence.
Pentagon shaped shell, it is not a Asian shore crab, it is green crab.
Photo of my evidence.
No legs, not a crab at all, it's a rock.
Species Observation: Species Looked For
Did you find it?: 
I think I did not find it
Scientific name:
Hemigrapsus sanguineus
Common name:
Asian shore crab
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
N 43.784870 °
W -69.722574 °
Observation Site Information
A photo of our study site.
Coastal - Rocky intertidal
Trip Information
Reid State Park river
Trip date: 
Tue, 2017-10-24 09:00
Town or city: 
Type of investigation: 
Species Survey
Time of low tide: 
Tue, 2017-10-24 08:47


Well done - nice close-up of the spines and I am so glad you didn't mistake that rock for a crab : )