Goniadidae is a family of marine worms within the Polychaeta.

[1][2] Goniadids have an eversible proboscis with a circlet of chitinous jaws around the terminal end.

[1][3][4] Goniadids are highly mobile, burrowing predators which inhabit soft sediments, including sand and mud.

[3] Goniadids tolerate a sediment mud content up to 60%, with an optimum range of 50-55%.

[2] They are usually distributed within the intertidal and subtidal zones, from shallow water to offshore continental shelf sediments.