The Caribbean reef octopus is a coral reef marine animal. It has eight long arms that vary in length and diameter. The mantle is large and chunky in comparison . This species is difficult to describe because it changes color and texture to blend into its surroundings, using specialised skin cells known as chromatophores. Its color range is very large; it can change from crimson to green, and bumpy to smooth. It weighs around 3.3 lb or 1.5 kg.