Tridachia v Elysia crispata
December 7, 1999
From: David W. Behrens
Note added 30 May 2006: This is may be Elysia clarki, a new species which was previously considered a colour form of E. crispata. I cannot tell whether there is a gap between the parapodia in the anterior midline, which is a character of the new speciees - Bill Rudman.
Dear Bill:
May I bring to you and your readers attention the collection of Elysia
crispata photographs on Mike Miller's Site - Nudibranch of the Week #156.
The red lined variation Anne submitted has been the norm for several years in Roatan, Bay Islands, Honduras. Very common. The green mantle aggregations of photosynthetic material in my specimens were absolutely iridescent. They seemed to sparkle and jump right off the tissue at you. I will try to find a photo for you.
Jeff Hamann's mangrove specimen (from Belize), shown here and linked to Mike's page is particularly interesting.
Such an interesting and variable species.
David W. Behrens
dave@seachallengers.com
Behrens, D. W., 1999 (Dec 7) Tridachia v Elysia crispata. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1656Dear Dave (& Jeff),
Thanks for the mangrove variety photo. This species does show amazing variety in colour. On reflection I guess I should have placed this species in Elysia rather than persevering with Tridachia. I have changed the species information at the Top of the Page, to follow Gosliner's review (1995) in which Tridachia is considered a synonym of Elysia.
Best wishes,
Bill Rudman.
Reference: 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 Californian Academy of Sciences, 49(1):1-54.
Rudman, W.B., 1999 (Dec 7). Comment on Tridachia v Elysia crispata by David W. Behrens. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1656Related messages
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