Aldisa williamsi from Indonesia

August 23, 2003
From: Linda Ianniello

Dr. Bill,
The Phyllidias are tough enough to identify, but here is one I am really stuck on. It looks like a Phyllidia with gills .... some kind of dorid? Sorry, I don't seem to have the rhinophores; I didn't notice the gills at the time I was taking the picture so didn't realize it was unusual until the film was processed. The only similar slug I could find is on page 110 of Ono Atsushi's book Opisthobranchs of Kerama Islands. Since I can't read Japanese, all I can determine is that he calls it a "Doris sp 1".

Date: August, 2003
Dive Site: Yellow Wall of Texas at Rinca Island, Indonesia
Depth: 55 feet

Linda I.

Ianniello, L., 2003 (Aug 23) Aldisa williamsi from Indonesia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Linda,
It is amazing what we can find in photos. This is one of the amazing 'phyllidiid mimics'. It is Aldisa williamsi. Another similar one is Aldisa erwinkoehleri, but it doesn't have the black rings around the gills and rhinophores as in A. williamsi
Best wishes,
Bill Rudman

Rudman, W.B., 2003 (Aug 23). Comment on Aldisa williamsi from Indonesia by Linda Ianniello. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Aldisa williamsi

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