Nembrothid from Sulawesi

April 4, 1999
From: Lindsay Warren

Dear Bill
Another illustration-only specimen found in the Tukang Besi Islands, SE Sulawesi last year during the research for Operation Wallacea.

Length: 3-4 mm.  A tiny specimen with fluorescent gills and rhinophores in red and orange.  The gills also had darker, almost blood red margins.  The base of the rhinophores was navy blue.  The body was blue but not a uniform colour as over the blue was a fine shade of darker blue/purple.  The foot was the same colour but slightly lighter.  Faint stripes appear on the mantle and are similar to Nembrotha lineolata but are dark with the smallest hint of brown.

It was found on coral rubble at a depth of 4. 8 m.  Thoughts were that it might be a Nembrotha or a Roboastra.  What do you think?

All the best

Warren, L., 1999 (Apr 4) Nembrothid from Sulawesi. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Lindsay,
It is certainly a nembrothid and from the head I would think it is probably a species of Nembrotha or Tambja. Species of the opisthobranch-eating genus Roboastra usually have prominent oral tentacles.

Best wishes,
Bill Rudman.

Rudman, W.B., 1999 (Apr 4). Comment on Nembrothid from Sulawesi by Lindsay Warren. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Nembrotha sp. 4.

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