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The black sea urchin, also called a long-spined sea urchin, is the most abundant and important herbivore on the coral reefs of the western Atlantic and Caribbean basin. When the population of these sea urchins is at a healthy level, they are the main grazers which prevent algae overgrowth of the reef. — Diadema antillarum (black sea urchin)

Illustration of Acanthaster planci (Crown-of-Thorns starfish), which preys on corals. — Acanthaster planci (Crown-of-Thorns starfish)

Illustration of a holothurian or sea cucumber. — Holothurian 1

Illustration of Linckia laevigata (Blue Linckia) — Linckia laevigata (Blue Linckia)

Illustration of Lytechinus variegatus (Variegated Sea Urchin) — Lytechinus variegatus (Variegated Sea Urchin)

Front view illustration of a Long Spined Urchin. It is found in the Indo-Pacific region, in dark reef up to 30 ft deep. It is active at night, hiding in crevices or under rocks at night.. — Echinothrix diadema (Long Spined Urchin)

Illustration of Pteraster tessalatus (Cushion Star) — Pteraster tessalatus (Cushion Star)

Illustration of Pycnopodia helianthoides (Sunflower Seastar) — Pycnopodia helianthoides (Sunflower Seastar)

Illustration of Daisy Brittle Star (O. Aculeata) — Ophiopholis aculeata (Daisy Brittle Star)

Illustration of a second Holothurian — Holothurian 2

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