Invasive SpeciesAsian shore crab

Hemigrapsus sanguineus
FOUND by MarsBars
ID Confirmed
Quality checked by Go science
Peer reviewed by Barbarous Butterflies
Field Notes
Our group went to Reid State Park at 9:15am before the park had opened the gate, they had to open it especially for us. It was 68 degrees outside. We used a 1-meter quadrant to look for the crabs. Our goal was to find the Asian shore crab (Hemigrapsus sanguineus). Our study site was a rocky intertidal and the rocks were covered in seaweed. We dug around in the seaweed, but did not have much luck finding any crabs but when we looked under the big rocks we found lots of crabs. We found a lot of invasive green crabs and we were happy to find that we found an Asian shore crab. We could tell that it was an Asian shore crab because it had banned legs and a square shell. Our group did not find any native crabs. We had lots of fun and lots of luck at Reid State Park.
Supporting Evidence
Photo of my evidence.
We thought that this was an Asian shore crab because of its banded legs. This crab also had six spines (three on each side).
Photo of my evidence.
In this photo, it shows that the color of an Asian shore crab. It shows the color stripes on its legs making it an Asian shore crab.
Photo of my evidence.
The Asian shore crab body has a square-ish shape to it. The top of the crab is more rounded than the rest of it and its sides are angled in.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Hemigrapsus sanguineus
Common name:
Asian shore crab
Sampling method: 
Quadrat (user-placement)
Photo of our sampling method.
Place Studied
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Map this species
N 43.785031 °
W -69.721759 °
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


Nice work identifying the key characteristics of this crab!