Invasive SpeciesGreen crab

Carcinus maenas
FOUND by Mrs. C
ID Confirmed
Quality checked by myself
Peer reviewed by myself
Field Notes
I think I found green crabs because they have a 5 sided shell (pentagon) and 5 spines on each side of the eye.
Supporting Evidence
Photo of my evidence.
Comparison of VS species card with found crabs showed the crabs I found had pentagonal shells and 5 spines on each side of the eye.
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
Time search
Photo of our sampling method.
Place Studied
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Map this species
N 44.774290 °
W -67.049728 °
Observation Site Information
A photo of our study site.
Coastal - Rocky intertidal
Trip Information
Bailey's Mistake, Lubec, Maine
Trip date: 
Wed, 2015-08-05 10:05
Town or city: 
Type of investigation: 
Species Survey
Eastern Coastal
Time of low tide: 
Wed, 2015-08-05 11:29


Hi Mrs. C,

Great evidence photo of the spines!

I noticed that your coordinates put you down the road from the ocean. It's important that the coordinates be accurate so that scientists and others can rely on the data and it's accuracy to help them answer their research questions. Can you help us get you in the right spot?

You can post updated coordinates right here in the comments and then we can update your post. If you don't have more accurate coordinates recorded, you can use this tool to help zoom way way in on where you were and find the coordinates.

Thanks for posting!


Thanks for the tool. Used it and the correct coordinates are
Couldn't find how to edit the coordinates on what I published. Can you direct me with that? Thanks, Mrs. C

Hi Mrs. C.

Once you publish, the only things that you can do are comment and request corrections and updates. The VS team takes it from there.

This is a good lesson to your students. This is why doing the data quality checklist carefully before publishing is really important. Once students publish, the data is live, in the database, and up for review.

I'm making your changes now. :)


Nice pic of the spines! Field notes can be a great place to get a more general idea of what is around your site such as the tide, amount of seaweed, what substrate, current weather, etc. You can move what you currently have in the field notes down to "evidence" as that's specifically linked to determining what species you have found (I did notice that you have the same info in your first piece of evidence). Anything else you noticed that would confirm that this is indeed a Green Crab?