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Useful Nudibranch Resources


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>



Nudibranch websites

Nudi Pixel is a web-based identification tool for nudibranchs worldwide using photographs as the first point of identification. It is underpinned by up to date scientific classification. User-friendly, as it is designed with non-scientist users in mind.

On the Sea Slug Forum you can find out more about nudibranchs, bubble-shells, sea hares and other sea slugs. This site aims to generate more interest in these fascinating animals by sharing information with a worldwide audience. The Forum is a useful tool for anyone with an interest in sea slugs from scientists and students to divers and aquarists.

The SLUG SITE is a website devoted to the study of heterobranch Molluscs. It is their hope that the Slug Site might become a way to share photos of critters new to you and new to us. This could facilitate identification of species and desemination of new range, distribution and ecological info on species around the world.

Photo galleries by David Harasti that have been developed to assist scuba divers in the identification of any species they may encounter on their dives within Nelson Bay.

Sea slugs and other marine invertebrates of the Tweed - Byron coast,  Australia. A record of some species found in the Brunswick River and at Hastings Point, New South Wales, Australia.
South west Indian Ocean seaslugs. In this website you can found information and photos about seaslugs from south west Indian Ocean: Mauritius, Reunion Islands and Comoro Islands.

Living Color
Toxic nudibranchs—soft, seagoing slugs—produce a brilliant defense
By Jennifer S. Holland, National Geographic Staff
Photographs by David Doubilet

The National Geographic has brought to your computer screen an article on Nudibranchs. The great part of this site is David Doubilet's photographs. Brilliant is the only word I can think of! The Puzzle is quite good too. Enjoy.

Edwin Kohler's listing of heterobranchs from around the World, alphabetically and taxonomically.

Dedicated to the study of the heterobranch Molluscs of Okinawa’s subtropical Western Pacific waters. Hopefully the site will be one which will facilitate the study and understanding of this diverse group of molluscs.

Wikipedia is a Web-based, free-content encyclopedia, which is written collaboratively by volunteers. It consists of 195 independent language editions sponsored by the non-profit Wikimedia Foundation. Entries on traditional encyclopedic topics exist alongside those on almanac, gazetteer and current events topics. Its purpose is to create and distribute, worldwide, a free encyclopedia in as many languages as possible. Wikipedia is one of the most popular reference sites on the Web, receiving around 50 million hits per day.

This site is dedicated to the study of Nudibranchs (Phylum: Mollusca Class: Gastropoda  Subclass: heterobranchia, Order: Nudibranchia), the colourful and bizarre marine slugs found throughout the world's seas and oceans. The images and information found on this site may contribute to expanding public and scientific awareness and interest. Much remains unknown about the life and times of nudibranchs, your discoveries may change this.

The web-based photo-gallery of marine images by Sergey Parinov. Here is the link to the best art!

A movie about Nudibranchs...entertaining.



Nudibranch books


Beesley, P.L., Ross, G.J.B. & A. Wells (eds) 1998. Mollusca - The Southern Synthesis Fauna of Australia, Vol 5. CSIRO Publishing.


Behrens, D.W. 1992.Pacific Coast Nudibranchs : A Guide to the heterobranchs Alaska to Baja California. Sea Challengers.

Behrens, D.W., C. Petrinos & C. Schrurs 2005. Nudibranch Behavior. New World Publications.

Coleman, N. 1989. Nudibranchs of the South Pacific. Sea Australia Resource Centre.

Coleman, N. 2001. 1001 Nudibranchs Catalogue of Indo-Pacific Sea Slugs. Neville Coleman’s Underwater Geographic Pty Ltd.


Coleman, N. 2008. Nudibranchs Encyclopedia. Neville Coleman’s Underwater Geographic Pty Ltd.

Debelius, H. 1996. Nudibranchs & Sea Snails Indo-Pacific Field Guide. IKAN-Unterwasserarchiv.


Debelius, H. & R. Kuiter. 2007. Nudibranchs of the World. IKAN-Unterwasserarchiv.

Gosliner, T.M. 1987. Nudibranchs of South Africa: A Guide to heterobranch Molluscs of southern Africa. Sea Challengers.

McDonald, G.R. & J.W. Nybakken 1980. Guide to the Nudibranchs of California. American Malacologists Inc.

MacFarland, F.M. 1966. Studies of the heterobranchiate Mollusks of the Pacific Coast of North America. California Academy of Sciences.

Marshall, J.G. & R.C. Willan 1999. Nudibranchs of Heron Island, Great Barrier Reef: A Survey of the heterobranchia (Sea Slugs) of Heron and Wistari Reefs. Backhuys Publishers.

Nakano, R. 2004. heterobranchs of Japan Islands. Rutles.

Ono, A., 1998. heterobranchs of Kerama Islands. TBS-Britannica Publications.

Russell, H.D., 1971. Index Nudibranchia. A Catalogue of the Literature 1554-1965. Delaware Museum of Natural History.

Thompson, T.E. 1976. Biology of heterobranch Molluscs Volume 1 The Ray Society.

Thompson, T.E. 1988. Molluscs: Benthic heterobranchs (Mollusca: Gastropoda). Linnean Society, Synopses of the British Fauna (new series) No. 8.

Thompson, T.E. & G.H. Brown 1986. Biology of heterobranch Molluscs. Volume 2.  Lubrecht & Cramer.

Wells, F.E. & C.W. Bryce 1993. Sea Slugs of Western Australia. Western Australian Museum Press.

Willan, R.C. & N. Coleman 1989. Nudibranchs of Australasia. Australasian Marine Photographic Index.

Willan, R.C. & J.E. Morton 1984. Marine Molluscs. Part II. heterobranchia. Leigh Marine Laboratory.



Nudibranch jewellery

Amy Shek's website with photos and jewellery. Nice Nudibranch jewellery and other diving related pieces, even egg masses!



Links for Nudibranch books
Australia's best (and only) selection of Nudibranch books. If there is a Nudibranch book in print anywhere in the world and we don't have it, we will find it for you. We also have a very strong marine and invertebrate section, including corals, coral reef ecology, marine fish and invertebrates, and more. We have a large collection of out of print material with excellent holdings of Australian natural history in all subject areas.

Find natural history books you have been looking for and ordinary bookshops don't offer, new, second hand or very old, popular or scientific.

The books included here are useful for a variety of reasons. Some have good anatomical and biological information, some have excellent photos, and some cover the animal of a geographic region we know little about. Most of these books are still in stock and can be ordered online.

Neville Coleman is a legend. He has written lots of marine books and photographed thousands of animals.

Natural history books for the SCUBA diver, marine biologist, student and underwater photographer. Over 250 titles covering marine biology, invertebrates and more. David and Diana Behrens

Next to being a publisher of new books, we also have an antiquarian department in various biological fields such as Algology, Entomology, Ichthyology, Malacology, Ornithology, Mammalogy, Botany, General marine biology, Palaeontology etc. We shall be pleased to send you the specific catalogues you may want or to discuss buying or trading books and journals.



Nudibranch webmaster Gary Cobb

All photographs and content © 2003-2024 Gary Cobb and contributing photographers