Caribbean Reef Octopus
Octopus briareus

f22 @ 1/60s, ASA 64, Nikonos II w 28mm and close up lens, Oceanic 200 watt-sec strobe with Ikelie 50 watt-sec slave strobe

"Caribbean Reef Octopus," Wikipedia, the free encyclopedia.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 (up to 60 cm long). This species is difficult to describe because it changes color and texture to blend into its surroundings, using specialized skin cells known as chromatophores. Its color range is incredibly large; it can change from crimson to green, and bumpy to smooth. It weighs around 3.3 lb or 1.5 kg.
Frederiksted Pier, St. Croix, U.S. Virgin Islands