Promachocrinus fragarius, commonly known as the Antarctic strawberry feather star, is a species of stemless, free-swimming crinoid.

[1] The discovery of the species gained significant media attention.

Its colour can range from "purple" to "dark-reddish", and it was described as having "ten rays" and "twenty arms".

[5] The type locality is at the South Sandwich Islands.

[6] The dispersal of Promachocrinus larvae was heavily influenced by Antarctic currents.