Navanax inermis in Brazil?

February 20, 2001
From: André Mazeron

Hi everyone.

I'm trying to identify a nudibranch I've seen during a dive in Florianópolis, south of Brazil. Searching the web, I've found some pictures of Navanax inermis, and it looks like the same nudibranch I saw. Although this site doesn't mention their presence in south Atlantic, could it be Navanax inermis?

Florianópolis is about latitude 29s. Date of observation was 01/14/2001, at about 14m deep, in a rocky area by a group of islands, not far from the coast.

Best wishes,

Mazeron, A., 2001 (Feb 20) Navanax inermis in Brazil?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear André,
I'm afraid I can only make a guess without a photo, but what you have most likely seen is Navanax aenigmaticus, which has been recorded from as far south as Sao Paulo, Brasil [as Aglaja evelinae].

Have a look at the photo of Navanax aenigmaticus at the top of this page. If you gave a photo it would be an interesting addition to the Forum. By the way, Navanax is not a nudibranch, it belongs to the Order Cephalaspidea, commonly known as 'Bubble Shells'. The nudibranchs belong to the Order Nudibranchia. Both the Nudibranchia and Cephalaspidea are opisthobranchs or sea slugs. Have a look at the Species List to get an idea of the relationships and diversity within the Opisthobranchia.
Best wishes,
Bill Rudman

Rudman, W.B., 2001 (Feb 20). Comment on Navanax inermis in Brazil? by André Mazeron. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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