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Nudibranch Domain

Images and Information about Sea Slugs from around the world

This is a site for aficionados of nudibranchs and their sea slug relatives, who want more than pretty pictures. At the launch the site is populated with an image of each species sighted on the Sunshine Coast, southern Queensland, Australia by  The Sunshine Coast Sea Slug Survey Team.

As the site develops, information, more images and references about each of the species will be added providing a helpful and valuable resource. The many hundreds of Indo-Pacific species, recorded by The Team when overseas, will also be regularly added significantly broadening the resource.

There are three ways to get your hit of Sea Slug knowledge.

  1. Species Profile features information about specific sea slugs. Navigate, Identify and Learn about species via the lists. Notification of the latest expanded entry will appear below on the Home Page.
  2. NudiNote features specific topics that can be sourced via its Archive. Notification of the latest entry will appear below on the Home Page.
  3. Understanding Nudibranchs is a book on general sea slug biology and behaviour that will be posted in parts, as they are completed.

Home to The Sea Slug Survey of the Sunshine Coast

The Sea Slug Snippet

Phyllidiopsis annae Brunckhorst, 1993

Three low, granular, blue, ridges with white crests bordered with black lines, some black spots towards mantle margin and black rhinophores with grey bases.

Lembeh Strait, Sulawesi, Indonesia.


Latest NudiNote

NudiNotes are interesting and informative short articles about sea slugs and their behaviour. 


Hexabranchus sanguineus The name says it all. It has six gills - Hexabranchus, and is blood-coloured - sanguineus. This species was originally described from the Red Sea. Specimens from that region are not red and white mottled as in the images posted here but are a...


UNIQUELY UNITED BUT DECEPTIVE DISPLAY The Suctorial Feeding Porostomata Nudibranchs In a previous NudiNote - The Little Scraper - the radula of sea slugs was discussed. Mention was also made of those sea slugs that do not possess a radula. Among the dorid nudibranchs...


Autotomy - the Self Sacrifice Defence   The ability to cast off a particular section of their anatomy, in order to facilitate escape from a predator, is possessed by a wide range of animals. Although the phenomenon, even in the Mollusca, had been recognized...


VIVA VARIATION Change is upsetting    Repetition is tedious.       Three cheers for variation! Mason Cooley Across all of the Sea Slugs there is an almost endless amount of variation. Different shapes, sizes, textures, patterns and colours. We aficionados of the Sea...

The Little Scraper

The Little Scraper Nearly all the sea slugs, just like nearly all the molluscs (except the bivalves), possess a radula in the buccal cavity for feeding. The radula is used not unlike a combination of teeth and tongue to rasp at, puncture, slash or grip the prey for...

Sorting out the True Nudibranchs

Sorting out the True Nudibranchs   The Nudibranchs are but one order, the Nudibranchia, in the informal group that we refer to under the umbrella of Sea Slugs although common and popular usage has seen the term Nudibranchs used incorrectly to refer to all the sea...


THE EXCEPTION TO “THE RULE” Phyllodesmium acanthorhinum is a rarely sighted, though widely distributed, species first recorded from Okinawa by Bob Bolland in 1987. The 15 mm long specimen pictured here was found in the Mooloolah River, southern Queensland, Australia...


CONGRESS ON CODIUM All of the sea slugs in the Sacoglossa order are herbivorous, well nearly all, a very few prey on the eggs of other sea slugs. However, that great majority that feed on plants do so by puncturing the cell walls of algae and sucking out the contents....


The true nudibranchs are divided into two suborders – Suborder Cladobranchia and Suborder Doridoidea. Without doubt the most noticeable external difference between the two is in the appearance of the gills. Here we must generalise of course with the dorids having a...


Trying to decide to which genus a phyllidiid nudibranch belongs from a photo can be a task of some difficulty. There are some external features that can be used, but these are not always easily observed. Here is a rough external guide boiled down to the basics:...

The current NudiNote is displayed above. Click to read more or slide to earlier NudiNotes using the arrows which appear when hovering over the image. Alternatively all the NudiNotes may be accessed via the button on the navigation bar above.

Species Profile

All species sighted have been listed on the website with at least one image. There is an ongoing update process whereby information about each species including references and additional images will be added. As each species is enhanced it will be featured here as a temporary notification of that latest update.

Information about this species has been added to its page with references. Additional images have been added to the gallery.

News and Updates

A new page will be coming to the website soon. RECORD OF FINDS will be a chronological archive of the dive and intertidal surveys undertaken by The Team detailing the species finds and circumstances.