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Nudibranchs of the Sunshine Coast,
Queensland, Australia, Indo-Pacific

Pic of the Week


Exciting come-back species in the river.


Thecacera pennigera

The river works magic.


Originally recorded in the Mooloolah River at La Balsa Park in April 26 2020 I wondered if I would ever see Thecacera pennigera again. The severe flooding that struck the eastern coast of Australia caused a lot of damage. It also killed everything in the river accept some species of fish.


Life is now beginning to come back. During our recent dive in the river we recorded 6 Thecacera pennigera. What a wonderful thing to witness.


This animal has a semi-transparent body covered with orange, yellow and black spots. Located behind the gills are two prominent papillae with opaque white ends. There are also papillae behind each rhinophore.


A beautiful species without a doubt.



Photo and text by Gary Cobb, La Balsa Park, Mooloolah River, Sunshine Coast, Queensland, Australia

Our Mission

LOCATE, RECORD, IDENTIFY and POST every species of HETEROBRANCH to be found on the Sunshine Coast Queensland, Australia.


To LOCATE through scuba diving and intertidal searching.


To RECORD by underwater and studio/taxonomic photography (including microscopy photography) of the specimens.


To IDENTIFY these species through invaluable support from qualified authorities in this field and developing reference resources.


To POST upon our web site not only images of the species and their natural history behaviour but also information concerning size abundance and localities. Additionally to disseminate to other sites information considered unusual.


Towards achieving these aims we will continue to acquire and develop the necessary equipment, resources and knowledge.


Have fun, learn and enjoy the Earth's greatest creatures!


Parting note.

Nudibranchs are amoung the most ephemeral of marine creatures. They greatly vary in size, colour and shape. They can be almost invisible or very bright and easy to see.



Peak Baggers Guide



Our Latest Find

Bulbaeolidia alba (Risbec, 1928)

10 mm - Mooloolah River, La Balsa Park, Buddina,
Sunshine Coast, Queensland, Australia

About this Nudibranch website

We embarked upon this adventure of ours while diving here on the Sunshine Coast, Queensland, Australia. Upon realizing the amazing variety of nudibranchs we were seeing, we developed an appetite for not only finding as many different species as possible but identifying and learning all we could about these most amazing creatures of the sea.

NOTE: This website is not definitive, and we don't claim to be, but it does show the viewer pretty pictures of what we find here in our wonderfully diverse survey area...Enjoy!
Naming Nudibranchs was born when a friend of Gary’s suggested we share our knowledge with the world. The site commenced in March 2003 when we set out on our quest to find, identify and record all of the nudibranchs here in our area. The ever changing sea and seasons give up new surprises every visit whether they are subtidal or intertidal.

Fran and Nevars Happy Nudibranchs


Nudibranch Central

FREE Stickers

We describe our searching and identifying component of the quest as The Treasure Hunt, and the recording thereof upon the web site as The Never Ending Story.


We welcome for inclusion on the site the findings of other workers in this area that we may not have yet recorded.


From this website a Nudibranch Identification book called Undersea Jewels - A Colour Guide to Nudibranchs was published in 2006. The book is a 'Colour Guide'. After all that is the first thing anyone remembers about first seeing a Nudibranch.


NOTE: From 2003 to 2018, content on this website was generated by Gary Cobb, David Mullins, with Terry Farr and Julie Schubert. From 2019, content has been generated by Gary Cobb.



Private Policy


Nudibranch webmaster Gary Cobb

All photographs and content © 2003-2022 Gary Cobb and contributing photographers.