Longibrachium arariensis

A polychaete worm of the Onuphid family. Onuphid polychaetes are tubicolous marine worms commonly reported worldwide from intertidal areas to hadal depths.

Antennae of about equal length, comparatively short, reaching to chaetigers 6 to 8. Anterior four
pairs of parapodia prolonged, with three distally recurved long hooks and 6–10 small hooks in each; hooks of
both sizes with two rows of immovable spines; chaetal sacs extending to chaetigers 12–23; subacicular hooks
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