Elysia cf. furvacauda retains at least three types of functional plastids, including rhodoplasts, and shifts plastid type seasonally. Functional Codium-type plastids are retained in the spring, Microdictyon-type plastids in the autumn and a mixture of Microdictyon-type
and rhodoplasts in the winter. With each major shift in chloroplast type (chloroplasts to rhodoplasts and back) there is a period in which the animals do not retain functional plastids, suggesting that adaptation to a new chloroplast type is necessary. All types of plastids are usually free
in the host cytoplasm, without a surrounding membrane of animal origin.
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