Phyllidia coelestis? from Borneo

August 8, 2006
From: Asther M. Lau

Concerning message #7255:

Hello Bill,

Can you please assist in identifying this nudi? I'm not quite sure if this is a Phyllidia coelestis or a juvenile Phyllidia varicosa.

Attached are two images, which one of them shows an egg ring next to the nudi. I've a feeling it's just coincident that this nudi is next to this ring of eggs. Don't thing the eggs belong to this nudi. But maybe you'll find it useful information.

Locality: Sipadan Island, Sabah, Malaysia, Celebes Sea. Depth: 18 metres. Length: 1.5 cm. March 13, 2004. Wall of Coral Reef. Photographer: Asther Lau

Asther M. Lau

Lau, A, 2006 (Aug 8) Phyllidia coelestis? from Borneo. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Asther,

It is still not easy to distinguish some species of Phyllidia clearly, and this is especially true of juveniles. I would suspect this may be a juvenile of Phyllidia ocellata or perhaps  Phyllidia exquisita but I'm afraid I can't be positive.

I can't say anything about the egg ribbon other than that it definitely was not produced by the small phyllidiid, and it certainly didn't hatch from the ribbon.

Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Aug 8). Comment on Phyllidia coelestis? from Borneo by Asther M. Lau. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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