Elysia pusilla (Bergh, 1872) [Elysiella]

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Elysia pusilla feeds on the calcareous green alga Halimeda. Because of the reduced parapodia, many workers followed Bergh and placed it in the genus Elysiella. IPN places it at page 86 in the genus Elysia:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs.
Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp.
Maybe Elysia sp. 06 is a variant of Elysia pusilla,
and Elysia sp. 11 might also turn out to be a variant of Elysia pusilla.
More information on Elysia pusilla as Elysiella pusilla are on Bill Rudman's Sea-Slug Forum!