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DescriptionEteone longa is a long, thin, many segmented worm with a flattened body up to 6 cm long and 1 mm in width. It is transparent yellowish-white in colour and is very active. There are 4 short antennae on the head and it has a smooth eversible proboscis. The parapodia are flattened and leaf-like in shape, forming a fringe down each side of the worm that give it the name 'paddleworm'.Eteone longa can be distinguished from Eteone flava, which is morphologically similar but rose-red to orange in colour.