NUDI GILL PIN-UP: Pteraeolidia Ianthina

In preparation for NUDI GILL, my debut picture book release in September 2022, I will be blogging about nudibranchs monthly. My hope is that you, too, will fall in love with these colorful little critters. Without further ado, allow me to introduce you to August’s supermodel:

Pteraeolidia Ianthina

A Serpent Pteraeolidia (Pteraeolidia ianthina). Halifax Point, Port Stephens, NSW. Photograph by Richard Ling.

A long serpentine body covered in blue, purple, green, or brown cerata (respiratory organs), earned this nudibranch the nickname of blue dragon. Its long winding body is reminiscent of a Chinese Dragon. So cool. Check out this mug. What a face!

Photograph by Sarah Han-de-Beaux. You have GOT to check out her website and amazing photographs, really!

What I find most astonishing about Pteraeolidia Ianthina is that is it solar-powered. Tesla has nothing on this baby! This nudibranch has developed a method of capturing and farming microscopic plants (known as zooxanthellae) right inside its own body. It’s a win-win relationship because the nudibranch provides protection for the plants and the plants help feed the nudibranch with the sugars they convert from the sun’s energy. (Read more about this on The Sea Slug Forum.)

The more zooxanthellae, the greener the nudibranch appears.

Talk about going green!

You can find these fiercely fabulous nudibranchs throughout the Indo-Pacific.

I hope you enjoyed meeting the Pteraeolidia Ianthina Nudibranch. Stay tuned for September’s NUDI GILL Pin-Up!


Bonnie Kelso writes and illustrates books for children and adults that encourage individualism and brave self-expression. She facilitates art workshops for her local community and beyond. Her debut picture book, NUDI GILL, will be released in September, 2022. A lover of nature and travel, she can be found wandering about outside with her family whenever a good opportunity to do so presents itself.

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