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cephalopod
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A blue-ringed octopus with bright blue rings on its beige body crawls over a rocky, coral-strewn seabed.
Follow researchers into the waters off Vancouver Island in search of the giant Pacific octopus
A blue-ringed octopus, Hapalochlaena maculosa, with bright blue rings on its yellow body and arms, is shown against a black background.
Mating ritual of cuttlefish explained
Observe a cuttlefish changing its colour as it swims near the Great Barrier Reef, off the coast of Australia
blue-ringed octopus ammonite fossils Image shows a reconstruction of squidlike creatures swimming. cuttlefish A nautilus mollusk with a spiral, brown-and-white striped shell and numerous white tentacles extending from its soft body, set against a dark background.
At a Glance
A blue-ringed octopus, Hapalochlaena maculosa, with bright blue rings on its yellow body and arms, is shown against a black background.
cephalopod summary
Quizzes
Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters
Animal Group Names
Lion (panthera leo)
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Mute swan with cygnet. (birds)
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The bearded vulture (Gypaetus barbatus) is seen in Switzerland on December 2024
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cephalopod: Media

class of mollusks
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Videos

Follow researchers into the waters off Vancouver Island in search of the giant Pacific octopus
Overview of the giant Pacific octopus.
Video: Contunico © ZDF Studios GmbH, Mainz
Mating ritual of cuttlefish explained
Learn about the reproduction of cuttlefish.
Video: Contunico © ZDF Studios GmbH, Mainz
Observe a cuttlefish changing its colour as it swims near the Great Barrier Reef, off the coast of Australia
A cuttlefish changing colour as it swims near the Great Barrier Reef, off the northeastern...
Video: © Fun Travel TV (A Britannica Publishing Partner)

Images

blue-ringed octopus
Blue-ringed octopus (genus Hapalochlaena).
© Sarawut Kundej/Shutterstock.com
blue-ringed octopus
Blue-ringed octopus (genus Hapalochlaena).
© SChantra/Shutterstock.com
blue-ringed octopus
Blue-ringed octopus (genus Hapalochlaena)
© Subaqueosshutterbug/iStock.com
ammonite fossils
A collection of ammonite fossils that date to the Lower Jurassic System.
© jonnysek—iStock/Getty Images
belemnoid cephalopods
Reconstruction of squidlike belemnoid cephalopods from the Cretaceous Period.
Courtesy of the American Museum of Natural History, New York
cuttlefish
Cuttlefish (Sepia officinalis).
Douglas P. Wilson
nautilus
A nautilus (Nautilus) floating in the water column of the ocean.
© Kristof Degreef/Shutterstock.com
octopus
Octopus (Octopus species) swimming.
© ozgur/Fotolia
Tropites
Courtesy of the trustees of the British Museum (Natural History); photograph, Imitor
Organizational levels and body diagrams of mollusks
Figure 1: Organizational levels and body diagrams of the eight classes of mollusks...
Encyclopædia Britannica, Inc.
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