Colonial hydroids.

[tmm161]

Is it common to have colonial hydroids growing on the legs of emerald crabs. I understand he has his feeler hairs but in between them are the appearance of hydroids

 

[Rtaylor]

Are you sure? I would think that unlikely.

 

[Makara23]

I see hair but where's the hydroids?

 

[Stephen Glover]

The hydroids I have seen are flourescent under Actinic lighting. If they don’t glow you are good.