Goniadidae
Goniadidae is a family of marine worms within the Polychaeta. Goniadids have long, slender bodies and can grow up to 260mm in length, although most are less than 50mm long.[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.[2][4] References
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