The sacoglossan "lettuce" slug Elysia crispata (formerly Tridachia crispata) must have come up in searches because of a published study on its juvenile dietary preferences by Clark & Bussaca (1978). The study listed Bryopsis plumosa among the algae that the juveniles chowed on. Batophora oerstedi, Halimeda spp, Penicillus spp, Caulerpa paspaloides and Caulerpa racemosa filled out the rest of the menu in the locality they studied.
Somehow, Clark & Bussaca's "will eat Bryopsis"
got twisted into "will eat Bryopsis exclusively"
Jensen & Clark (1983) even showed that Caulerpa verticillata beat out Bryopsis for food preference among the lettuce-slug juvies.
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