Re: Pattyclaya brycei - Range Extension

April 25, 2006
From: Corey Whisson

Concerning message #16395:

Dear Bill,
The demise of Pattyclaya (and three other genera - Tridachiella; Tridachia and Elysiella) to Elysia was sourced from the following publication:

Gosliner, T.M. 1995. The genus Thuridilla (Opisthobranchia: Elysiidae) from the tropical Indo-Pacific, with a revision of the phylogeny and systematics of the Elysiidae. Proceedings of the California Academy of Sciences, 49(19): 1-54.

I hope this, and the shot of the gill-like lamellae, helps.


Whisson, C.S., 2006 (Apr 25) Re: Pattyclaya brycei - Range Extension. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Corey,
Thanks for your reply, and thanks for the photo of the transverse lamellae. Fortunately Clay Carlson & Patty Jo Hoff have sent photos of P. arena for comparison.

After asking about the demise of Pattyclaya I remembered Terry Gosliner's paper. I understand there is a paper in press concerning a sacoglossan phylogeny based on DNA studies so I think I will wait until that is published before dispensing with Pattyclaya. If P. brycei and P. arena are in fact distinct species, it seems to me that the remarkable development of transverse lamellae on the inside of the parapodial flaps in both species, is a new evolutionary adventure within the Elysiidae [Plakobranchidae] and deserves recognition. We need to remember that cladistic analyses are not 'the truth', they are just hypotheses, and dare I say it, sometimes they may need more work.

Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Apr 25). Comment on Re: Pattyclaya brycei - Range Extension by Corey Whisson. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Pattyclaya brycei

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