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Let my quote Bill Rudman:"Some authors have identified this northwestern pacific species with the Carribbean E. flava, but until the antomy of the two are compared I would think such a synonymy is premature."
Let me quote Jensen (2003):"It is possible that this species should be synonymized with Elysia flava Verrill, 1901"
Jensen, K.R. 2003. Distributions, diets and reproduction of Hong Kong sacoglossa (Mollusca: Opisthobranchia): a summary of date, 1980-2001 in Perspectives on Marine Environment Change in Hong Kong and Southern China, 1977-2001 (ed. B. Morton).
Proceedings of an International Workshop Reunion Conference, Hong Kong 21-26 October, 2001. Hong Kong University Press.
IPN writes at page 81 in the description of Elysia flava:''Elysia obtusa is a synonym."
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426 pp.
WoRMS lists Elysia obtusa with the status accepted.
More information on Elysia obtusa are on Bill Rudman's Sea-Slug Forum!