Elysia crispata v Tridachia crispata

October 17, 2000
From: Kathe R. Jensen

Dear Bill,

You are asking a tricky question. I think the genus Elysia will probably need to be split into 2, 3 or more genera pending thorough phylogenetic analysis. Kerry Clark had a Ph.D. student who did electrophoresis on a number of Florida Elysia species. Unfortunately this student went away without ever publishing his results. As far as I remember he came up with 3 species groups of which E. crispata was in the middle one, meaning that if we accept Elysia as one genus, E. crispata does not need a separate genus. However, if we decide to split Elysia, then E. crispata and maybe one or two other species need another genus name. This is why I don't want Tridachia to be completely forgotten.

I hope that some day someone will find it sufficiently challenging to do a phylogenetic analysis on the Caribbean plakobranchids, including morphological as well as molecular data. Unfortunately I am a little too far away at the present time.

Best wishes,
Kathe

jensen@ait.ac.th

Jensen, K.R., 2000 (Oct 17) Elysia crispata v Tridachia crispata. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/3192

Thanks Kathe,
I wasn't trying to put you on a spot. I was just curious. Let's hope you can whet some student's appetite to look at the big picture.
Best wishes,
Bill Rudman.

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