Acrocnida brachiata, the sand burrowing brittlestar, is a species of brittle star in the family Amphiuridae.

[2] It occurs on the seabed in the northeastern Atlantic Ocean and the North Sea, living semi-buried in the sand with only its arm tips projecting.

The arms, which like other brittle stars flex sideways rather than up and down, have a pair of tentacle scales on each joint as well as numerous spines.

It is common round the coasts of the British Isles where its depth range is from the lower shore down to about 40 m (130 ft).

Study of these differences led to the describing of a new species Acrocnida spatulispina by Sabine Stöhr and Delphine Muths in 2009, for the deeper water individuals.