New nudibranch paper is out

Norwegian scientists Jussi Evertsen and Torkild Bakken has published a paper about the diversity of Norwegian sea slugs. Ten of the fifteen species covered in the paper were found at the Nudibranch Safari!

Posted on Feb 22, 2013
The paper, entitled 'Diversity of Norwegian sea slugs (Nudibranchia): new species to Norwegian coastal waters and new data on distribution of rare species', was published in Fauna norvegica on February 13, 2013.

Included are five nudibranch species new to Norway and new data on ten species which are considered extremely rare.

Eubranchus rupium, a new species for Norway.

I am very proud that 10 of the 15 species were found at the Nudibranch Safari at Gulen Dive Resort, where the house reef has proven to be a true treasure chest with 54 documented species so far.

» Click here to read more about the Nudibranch Safari

The new species reported in the paper includes Doridoxa ingolfiana (a deep-water species), Goniodoris castanea, Onchidoris sparsa, Eubranchus rupium and Proctonotus mucroniferus.

Tritonia lineata was documented for the first time in 140 years at the Nudibranch Safari.

Both Gonoidoris castanea and Eubranchus rupium were found on the house reef at Gulen during the Nudibranch Safari in 2010. The first one was found by Thorbjørn Rusnes, while the latter was discovered by yours truly.

I found the Procotonotus mucroniferus on a trip to Vikaneset south of Kristiansund in 2005, which was the first observation in Norway. A year later several specimens of this cryptic nudibranch was found at Austevoll south of Bergen with Bjørnar Nygård.

» Read more: Very rare nudibranch photographed

The species mentioned as rare in the paper include Lophodoris danielsseni, Onchidoris depressa, Palio nothus, Tritonia griegi, Tritonia lineata, Hero formosa, Janolus cristatus, Cumanotus beaumonti, Berghia norvegica and Calma glaucoides.

Except for Tritonia griegi and Calma glaucoides, all were found at the Nudibranch Safari!

Berghia norvegica has never been seen since its discovery in 1937, until it shows up at the Nudibranch Safari at Gulen Dive Resort.

The Berghia norvegica was initially thought to be a completely new species, until Jussi Evertsen and Torkild Bakken were able to compare the radula with those in the original description of this species from 1937.

» Click here to read more about Berghia norvegica

Several of the rare nudibranchs turn up in pretty good numbers at the Nudibranch Safari, and it should be possible for most people to be able to see them.

Nudibranch project

Jussi Evertsen and Torkild Bakken have been running a nudibranch program since 1997, mapping the distribution of species along the Norwegian coast.

» Click here to visit the nudibranch project blog

The paper is available in English and can be downloaded as a PDF using the link below.

» Click here to read the paper at Fauna norvegica

Telephone: +47 94 83 32 83
E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Christian Skauge
Etterstadsletta 4 G
N-0660 Oslo, Norway


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