Angular Brittle Star

Like other brittle stars, O. angulata has a central disc and five slender, unbranched, jointed arms; the spines on the arms are twice as long as the arms are wide. It is somewhat variable in appearance and difficult to distinguish from other species of brittle star occurring in the same localities. The colour also varies, but populations in Florida are often reddish-orange, with a longitudinal white line along the upper surface of the arms. This brittle star grows to a disc diameter of about 10 mm (0.4 in).

O. angulata occurs in the western Atlantic Ocean, the Caribbean Sea and the Gulf of Mexico. Its range extends from North Carolina southwards to Brazil and its depth range from subtidal to 200 m (660 ft). Its typical habitat is on reef rubble, where it lives among bivalve molluscs, sponges and algae. Young individuals are found particularly in association with the calcified green alga Halimeda.