Ophiothrix angulata, the angular brittle star, is a species of marine invertebrate in the order Ophiurida.

It is found in the warm waters of the western Atlantic Ocean, the Caribbean Sea and the Gulf of Mexico.

The colour also varies, but populations in Florida are often reddish-orange, with a longitudinal white line along the upper surface of the arms.

[3] O. angulata is a filter feeder and detritivore, spreading its arms widely to intercept phytoplankton and detritus drifting past.

[3] The reproduction of this species has been little studied, but it is thought that breeding takes place by releasing gametes into the sea in response to variations in environmental cues such as changes in temperature.