New Nudi’s! A Nudiphile Episode

After a somewhat disappointing week in the Caribbean (photographically speaking), I came home and did three days of diving along my beloved California Coast.  What a wonderful week it has been!  The ocean seems to be coming alive again after taking a break over the winter.  The warmer “El Nino” waters seemed to have been detrimental to our local small marine animals, but now they are making a comeback.  I found many species of nudibranchs and their eggs on my dives and even some I haven’t seen before.  Here are a few of my favorites:


This nudibranch is actually a headshield slug called a Navanax.  It is carnivorous and will track it’s prey (other nudibranchs) by following their slime trail until it catches them and eats them.


This Hopkin’s Rose is one of my favorite nudi’s.  It is very small (about the size of a fingernail).


This was one of hundreds of Hermissendra crassicornis that were all over the rocks.  I haven’t seen any for a few years, so this was particularly exciting.


Here is a Porter’s Chromodorid, which is only about an inch long and seems to be proliferating in the Laguna Beach area.

MacFarland's Chromodorid

MacFarland’s Chromodorid

Porter’s cousin, MacFarland was also present and accounted for.


There were so many Hermissendra crassicornis at this site that they were crawling all over the other nudibranchs, including this Diaulula sandiegensis (San Diego Dorid).


And to my great joy and satisfaction, I found this Polycera tricolor, a nudibranch I have never seen before.


Lately, I haven’t seen the nudibranch in the above picture (which I discovered a year ago at Catalina Island, and which has not been defined yet), There have been reports that it is alive and well on the island and hopefully here to stay in California.

As always, if you enjoy my images please visit my website,, or give me a like on facebook at Waterdog Photography Brook Peterson.  Don’t forget to follow me here at waterdogphotographyblog!
These photographs are taken with a Nikon D810 or D7000 in Sea and Sea Housing using two YS-D1 Strobes.
All images are copyrighted by Brook Peterson and may only be used with written permission.  Please do not copy or print them.  To discuss terms for using these images, please contact me

4 thoughts on “New Nudi’s! A Nudiphile Episode

    • Thanks Emilie! That one is especially dear to me because I am the one who discovered it in California! Currently, we have had its DNA sequenced and it does not appear to be closely related to it’s cousin, Placida cremoniana. Hopefully we will soon have conclusive evidence that it is a new, never-been-discovered-before nudibranch!


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s