Can anybody tell us what the purple "arms" are?

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Postby PATMWILLIAMS » Mon Feb 14, 2011 12:00 pm

We took this photo of nudis mating, but are curious about the bright purple "arms " apparently sticking out the gills of the left hand nudi. Can anybody tell us what they are?

Colours have lost a bit in the JPG translation so arms not quite so bright now!


Pat and Paul
Nudibranchs mating.jpg
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Postby Kevin Lee » Mon Feb 14, 2011 4:29 pm

Hi Pat,
Thanks for your post. The purple "arms" are likely egg sacs of a parasitic copepod. This is not uncommon. Here is another example: ... 1312_Vzz6j

Best regards,

Kevin Lee

Postby PATMWILLIAMS » Sun Feb 20, 2011 8:49 am

Fascinating. Thanks Kevin.


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Postby scottg » Tue Feb 22, 2011 12:20 am

wow, great example of parasitic behavior... thanks for posting Pat!

Scott Gietler Owner/Editor, Underwater Photography Guide & Bluewater Photo

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