Nephtyidae is a family of polychaete worms.

[2] Nephtyidae are pale, clearly segmented polychaetes with a small pentagonal prostomium with two pairs of small antennae.

Their segments are little differentiated and have a rectangular cross-section.

[3] Nephtyids are active predators, with a strong muscular proboscis, armed with two well developed jaws.

[4] They can dig relatively fast through sandy sediments.