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Plakobranchidae

The family Plakobranchidae (listed as Elysiidae in some sources) includes shell-less species with flap-like parapodia extending over the sides of their bodies. The parapodia contain branches of the digestive gland and also function in respiration. Many species retain chloroplasts as kleptoplastids and some may show substantial variation in morphology based on differences in diet or associated chloroplasts. They may be either diurnal or nocturnal. There are at least 23 species known from Hawaii in three genera (Elysia, Plakobranchus and Thuridilla).

Thuridilla hoffae is listed for French Frigate Shoals from a pre-2006 cruise but we lack confirmation for the record.

Elysia degeneri

Elysia lobata

Elysia marginata

Elysia nealae





Elysia obtusa

Elysia pusilla

Elysia rufescens

Elysia tomentosa





Elysia
cf. trisinuata

Elysia
sp. #2

Elysia
sp. #4

Elysia
sp. #5





Elysia
sp. #6

Elysia
sp. #7

Elysia
sp. #9

Elysia
sp. #10





Elysia
sp. #12

Plakobranchus ocellatus

Thuridilla carlsoni

Thuridilla
kathae





Thuridilla multimarginata

Thuridilla neona

Thuridilla sp. #3

 
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