Antipatharians are tree-like or stick-like
cnidarians with a solid dark brown skeleton decorated with small spines or knobs.
The rough surface distinguishes it from gorgonians and arborescent
which are nearly absent in shallow Hawaiian waters. Colonies occur along
current-swept drop-offs and under ledges. Live colonies may be rusty brown,
orange, yellow, green, or white due to color of the polyps. They may also fluoresce;
this color is not recorded when a flash photograph is taken. Antipatharians provide
food or shelter to several forms of marine life, including fishes, mollusks, and crustaceans.
Most species only occur at depths visited
by research submersibles. It is illegal to collect
Hawaiian corals without
a special permit.