Nerilla antennata is 1–2 mm colourless meiofaunal polychaete.

On the prostomium it has four eyes and two ciliated nuchal organs on the side.

The other segments have both dorsally – and ventrally parapods with simple chaetae.

Nerilla antennata lives interstitially (between grains of sand) and between algae.

It is widely distributed with findings in European waters and around New Zealand.