Cephalopods of Sydney

Cephalopods are the most advanced of the Molluscs.


Octopus Blue Ring Octopus

A common Octopus australia mimics the sponge with its clever skin.

The term "thinking skin" or "intelligent skin" is very appropriate when you learn about the thousands of up to three types of chromatophores each with up to 20 muscles and separate nerves. The colour change mechanism is extremely complex but is explained simply and clearly in my marine biology course.

The Blue Ring Octopus hunting in the dark. Blue rings are exciting to see becuase they are so deadly. Providing that you do not touch them they are harmless because of their shy retiring and secretive nature. Like most marine life, they would prefer to slink away and be left alone. This one is actually the Blue Lined Octopus, Hapalochlaenea maculosa. You will notice the blue lines are not actually circles as in H. lunulata.
Sepia apama
A Scorpionfish is being eaten by a Mourning cuttlefish.. Scorpionfish too can become food for other hungry creatures. I have seen Sepia species hunting shrimp with their very long Hectocotylus tentacles. These tentacles are more than double the length of the other eight arms.They use their lateral fins to slowly creep closer to prey. When they are close enough, they strike with these two hunting tentacles at lightniong speed. Sepia apama is the world's largest cuttlefish. It lives in Sydney. We are very fortunate to have many unique and special animals on our marine doorstep. Sydney waters have many world class marine treasures that are just as valued to divers as koalas and other Aussie treasures of the natural world are to land based nature lovers.