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Portly Spider Crab Carapace

Libinia emarginata


Libinia emarginata is roughly triangular in outline and very heavily calcified, with a carapace about100 mm long and a leg span of 300 mm. The carapace is covered in spines and tubercles, and often clothes itself in debris and small invertebrates.


L. emarginata occurs from Nova Scotia to the Florida Keys and through the Gulf of Mexico. It lives at depths of up to 49 m. I found this one in the intertidal zone in Milford, CT.


Thanks anneandkids1999, ChrisRodda, and Mark Ridgway for help with the ID!

1 Species ID Suggestions

ChrisRodda 8 years ago
portly spider crab
Libinia Emarginata Libinia emarginata

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I think it's OK as it is now.

Christine Y.
Christine Y. 7 years ago

Okay, thanks for explaining Malcolm. I changed the common name, do you think I should clarify further in the description?

Hi Christine and Mark, I had not realised it was just a carapace and not the whole animal. I have restored it to the mission. The fact that you described the entire organism in the description (the unseen legs) without specifying that this was the carapace only threw me.
We have a lot of students and other users posting entire organisms both dead and alive but these are not considered signs of wildlife and we have to remove them. We are doing this on behalf of the mission creator who is one of our founders but currently away earning a living.
Please accept my apology.

Christine Y.
Christine Y. 7 years ago

Okay Mark. I'll wait to see what Mark thinks as well. In the meantime, I'll add carapace to the common name. Thanks!

Mark Ridgway
Mark Ridgway 7 years ago

Hi Christine. Malcolm does an incredible amount of background work for this project, tidying missions up, and I suspect he did this in a little haste. I agree it's as valid for this mission as a shell of any animal. Maybe you could change the common name to clarify that it's a 'carapace' and not the full animal. Let's see what Malcolm says when he comes back and has another look.

Christine Y.
Christine Y. 7 years ago

Thanks Malcolm. One question though- this was just the carapace, and it was empty. So, wouldn't that just be a sign of wildlife, like an empty shell?

Removed from "Signs of Wildlife" mission.
Organisms are not signs of wildlife and are not permitted in this mission.

Christine Y.
Christine Y. 8 years ago

Thanks everyone for your help!

Mark Ridgway
Mark Ridgway 8 years ago

That looks a good call Chris.

anneandkids1999 8 years ago

That's a shell to a spider crab

Christine Y.
Spotted by
Christine Y.

Connecticut, USA

Spotted on Aug 3, 2013
Submitted on Apr 29, 2014

Spotted for Mission

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