Re: Placida cf. dendritica from Sydney

March 26, 2000
From: Cynthia Trowbridge

Dear Bill,

Hi. It warms my heart to see all the photos of Placida cf. dendritica. The species is common throughout SE Australia, including Tasmania, around Melbourne (Port Phillip Bay and Western Port), and Sydney. I am using molecular techniques to amplify and sequence mitochondrial genes of this "species" or potential "species complex" throughout the world. I have collected animals from Scotland, Ireland, Australia, New Zealand, Oregon, and Japan to do my molecular work. If any colleagues from South Africa, the Mediterranean, South America, or the east coast of the U.S. had animals, I would gladly pay expenses and a collection fee to include animals from those areas.

In terms of why I think there are more than one species grouped under the name, I have studied the ecology of this "species" pretty intensely since about 1984 and there are some unusual anomalies in the chemical ecology, physiology, behavioural ecology, etc. Such anomalies would be easier to explain if this was a species complex.

Cynthia Trowbridge

Trowbridge, C., 2000 (Mar 26) Re: Placida cf. dendritica from Sydney. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Cynthia,
If you have photos of any of the other geographic 'forms' I would be happy to post them on the Forum for comparison. If any one can help Cynthia with specimens, it would be great to resolve just what "Placida dendritica" is.
Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Mar 26). Comment on Re: Placida cf. dendritica from Sydney by Cynthia Trowbridge. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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