Re: Polycerella emertoni

February 23, 2000
From: Eric Pederson

Dr. Rudman,

Thank you for your assistance in the identification of the sea slug. I have just received a reply from someone else I sent the photos to who agrees with you on the genus, but has named it Polycerella conyna Marcus, 1957. Some figures can be found in Bull Mar Sci 10(2):159. Let me know what you think.

Thanks again,

Pederson, E., 2000 (Feb 23) Re: Polycerella emertoni. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Eric,
I should have mentioned there are a number of names floating in the literature for what is generally considered to be one species. Franz & Clark (1972) studied a large population and considered the variation within that population covered the so-called differences between P. conya (originally described from Brazil) and P. emertoni. Marcus (1976) re-examined material from Brazil and P. recondita Schmekel, 1965 from the Mediterranean and agreed that they are all conspecific, the earliest name being P. emertoni.

I don't know of a later study contradicting that view. I am sorry I didn't think of mentioning Franz & Clark's paper as it has some basic biological information which would be of interest to you.

I have added a list of references at the top of the page in case anyone wishes to follow this up.

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Feb 23). Comment on Re: Polycerella emertoni by Eric Pederson. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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