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Pom Pom or Boxer Crab Egg sac

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#1 Karen Honeycutt

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Posted 16 December 2013 - 08:05 PM

I presume the object under the crab is an egg sac, but all the examples I found on the web (admittedly all were from aquariums - I could find none from nature) were red in color.  Can anyone help?

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  • Lybia tesselata (Mosaic Boxer Crab) - Bali, Indonesia 2.jpg

#2 Alex_Mustard


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Posted 17 December 2013 - 12:40 AM

Yes, this is a parasite egg mass. The parasite infects the crab (often a barnacle parasite) and then changes the crab to a female (if it is not already) and makes the crab do its nefarious bidding - produce more parasite eggs.


The crabs are otherwise health - which of course is in the parasites interest too.



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