bonellia viridis

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Green Spoonworm (Bonellia viridis)

…is a species of Echiruan or spoonworm found in the north-eastern Atlantic, Indian, and Pacific oceans, and the Red and Mediterranean and Red seas. Green spoonworms are highly sexually dimorphic, the females take the green form you see above, the males however are planktonic and live inside the females body. The presence/absence of the pigment bonellin determines sex. Green spoonworms are mainly detritivores and will anchor themselves to the floor with two hooks. They will also feed on small invertebrates aswell by using an extendable proboscis which is 10x their body size.

Phylogeny

Animalia-Echiura-Echiuroidea-Bonelliidae-Bonellia-viridis

Image Source(s)