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Thorunna sp. 1 - 12 mm

Terry's Delight, Coolum, Queensland, Australia


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Colobocephalus sp. 1

Our recent dives at Bicheno in Tasmania revealed a very unusual discovery. Our searching on the second day turned up what we eventually thought was a Colpodaspis sp. Our own first thoughts on this specimen was that it is perhaps a species of Pleurobranchida however without evidence of the trapezoidal veil and a side gill down the right side we could not push that idea. The following day we decided to try and find it again to obtain better photos of some of the anatomical detail. A very intensive search in the same area finally turned it up only 30cm away from the previous day's position.


Imagine our disbelief when upon sending the pics to Bob Burn for his thoughts he subsequently informs us that they are two different species. It transpires that it was the second find that happens to be the Colpodaspis sp. but the first he has given a provisional ID as Colobocephalus sp. The lack of a posterior siphon and the slit in the short head tentacles (formed by the rolling up of the headshield) facing downwards are two features he pointed out. This genus has only been reported from deep waters off Norway. They both currently belong to the Diaphanidae family.


Photo and text by David Mullins, Bicheno, East Coast, Tasmania.




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Our 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. 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.



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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.


Our Mission


Branchers PsalmLOCATE, RECORD, IDENTIFY and POST every species of OPISTHOBRANCH to be found on the Sunshine Coast Queensland, Australia. Learn more>


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 fromqualified 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 (see Useful Resources).


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!

Gary, David and the Team
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Parting note.

Nudibranchs are 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. Learn more>


Tawali diving 2013


Tawali Species List (PDF) click here.



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