Callistoctopus macropus

Photo Credit:US National Oceanic and Atmospheric Administration, http://www.photolib.noaa.gov/htmls/reef2063.htm

Image ID: reef2063, The Coral Kingdom Collection
Location: Gulf of Aqaba, Red Sea
Photographer: Mr. Mohammed Al Momany, Aqaba, Jordan
Smaller photo also available from the GIMP-savvy photo library

Source: https://commons.wikimedia.org/wiki/File:Octopus_macropus_-_The_Coral_Kingdom_Collection.jpg

The Atlantic white-spotted octopus, white-spotted octopus, grass octopus or grass scuttle (Callistoctopus macropus) is a species of octopus found in shallow areas of the Mediterranean Sea, the warmer parts of the eastern and western Atlantic Ocean, the Caribbean Sea, and the Indo-Pacific region. This octopus feeds on small organisms which lurk among the branches of corals.