Heron Island, intertidal [Great Barrier Reef, Australia], 7 mm long, January 1994. Photo: Julie Marshall
This species was very briefly described by Pruvot-Fol, from New Caledonia, as green with darker green spots, the edge of the parapodia bearing up to four pairs of dendritic papillae. Pruvot-Fol considered the parapodial papillae to be sufficiently distinct to erect a new genus . Carlson & Hoff (1978) report a similar, very small species (max. length 6.5mm), from Guam. The only difference is that their specimens had only 2 pairs of parapodial papillae. As Pruvot-Fol noted that the most anterior pair of papillae in her specimen were very small, it is most probable that the Guam specimens are conspecific. There is a good photo in Atsushi Ono's book (p47) from Kerama Ids.
• Pruvot-Fol, A. (1930). Diagnose provisoires (incomplètes) des espèces nouvelles et liste provisoire des mollusques nudibranches recueillis par Mme. A. Pruvot-Fol en nouvelle Calédonie (Ile des Pins). Bulletin Muséum National d'Histoire Naturelle Paris, series 2, 2(2): 229-232.
Rudman, W.B., 2001 (October 23) Elysia mercieri (Pruvot-Fol, 1930). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/elysmerc
Elysia mercieri from Guam
From: Clay Carlson & Patty Jo Hoff, September 14, 2005
Elysia mercieri? from the Red Sea
From: Oren Lederman, September 10, 2005
Elysia mercieri from Heron Island
From: Julie Marshall, April 22, 2002
Elysia sp. from the Line Islands
From: Cory Pittman, October 29, 2001