19 hours ago, Jens H said:

The “bible” of nudibranchs. Here you will find almost everything you need to know about nudibranchs that you might encounter underwater. Unfortunately currently out of stock, try to get a used copy or a PDF:

Nudibranchs of the World (Debelius, Kuiter), ISBN 978-3939767060.

Nice book on creatures you see during muck diving. However, it is still not complete -that would be mission impossible:

Muck Diving: A Diver's Guide to the Wonderful World of Critters (Nigel Marsh), ISBN 978-1921517815

I have a copy of this book, I have been told there are some inaccuracies in it, I think from one of the Nudibranch ID facebok groups and also that a lot of species have changed names like all the Chromodoris sp. that are now Goniobranchis for example. I still use to get a starting point and cross check by googling the species name.

23 hours ago, Jens H said:

The “bible” of nudibranchs. Here you will find almost everything you need to know about nudibranchs that you might encounter underwater. Unfortunately currently out of stock, try to get a used copy or a PDF:

Nudibranchs of the World (Debelius, Kuiter), ISBN 978-3939767060.

There's one on Abebooks for 463 USD 😱

19 hours ago, Chris Ross said:

I still use to get a starting point and cross check by googling the species name.

That’s the correct way, but use WORMS page to check if the name is correct or outdated: https://www.marinespecies.org

Once you have determined the scientific name of an animal, you can find out about its lifestyle, behavior, ecology, etc., regardless of whether you look up Discodoris atromaculata or Peltodoris atromaculata, for example: you will receive the same information. Names are pretty irrelevant; it is more important to know about other things. And I say that as a biologist. :-)

Far too often, some divers know the exact names of underwater organisms, whether scientific or popular scientific names. But they know nothing about their way of life and ecology. It should be the other way around!

Edited December 6, 2025Dec 6 by Jens H

On 12/6/2025 at 2:39 PM, Jens H said:

That’s the correct way, but use WORMS page to check if the name is correct or outdated: https://www.marinespecies.org

Once you have determined the scientific name of an animal, you can find out about its lifestyle, behavior, ecology, etc., regardless of whether you look up Discodoris atromaculata or Peltodoris atromaculata, for example: you will receive the same information. Names are pretty irrelevant; it is more important to know about other things. And I say that as a biologist. :-)

Far too often, some divers know the exact names of underwater organisms, whether scientific or popular scientific names. But they know nothing about their way of life and ecology. It should be the other way around!

Yes, though it's surprising how little info there is on many species!