Bonellia viridis

Rarity: Common

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What Wikipedia says

Bonellia viridis, the green spoonworm, is a marine worm (class Polychaeta, phylum Annelida). It is noted for displaying exceptional sexual dimorphism, for having an unusual sex-determination system, and for the biocidal properties of a pigment in its skin.

Excerpt from the Wikipedia article “Bonellia viridis”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Sylvain Ledoyen, CC BY 2.5, via Wikimedia Commons.