The class Cephalopoda consists of the squids and octopuses. The name means head-foot and they have large heads with a mouth and horny beak, surrounded by muscular tentacles, sometimes with suckers or hooks. The shell may be reduced or absent. They have large eyes and part of the mantle forms a muscular siphon through which water is forced to provide jet propulsion. Some can change color by way of camouflage and several extrude a cloud of ink for protection. They are all marine and many are big, swift and intelligent.

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Architeuthis dux: Giant Squid
Research project by Jordan Mandli on this species, including its classification, general description, adaptations to its deepwater environment, habitat, nutrition and the legends that surround it.
Cephalopod
Information from Wikipedia on this class of marine molluscs which includes the squid, cuttlefish and octopus.
Cephalopod International Advisory Council
Supports and encourages cephalopod research and communication among cephalopod researchers by means of meetings, workshops, and a newsletter.
The Cephalopod Page
Personal site of Dr. James B. Wood devoted to the cephalopods with extensive galleries and articles.
Cephalopoda
Classification and images of cephalopods from the Tree of Life project.
Coleoidea
Photographs and information on octopods, squids, cuttlefishes and their relatives from the Tree of Life Web Project.
Common Cuttlefish: Sepia officinalis
Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
Common Octopus: Octopus vulgaris
Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
Curled Octopus: Eledone cirrhosa
Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
Cuttlefish: the Sentient Cephalopod
This page includes a true story of human-cuttlefish interaction, and several photographs.
Giant Cuttlefish: Sepia apama
Photographs, videos and information from ARKive.
Giant Squid
Information about Architeuthus dux and an illustration.
Nautilus pompilius: Nautiluses
Photographs and information on Nautilus and Allonautilus which are the last living genera of externally shelled cephalopods.
Nautilus: Nautilus pompilius
Photographs, videos and information from ARKive.
North Pacific Giant Octopus: Enteroctopus dofleini
Photographs and information from ARKive.
Ocean Planet: In Search of Giant Squid
Myths and facts about the giant squid.
The Octopus News Magazine Online
An online community and news magazine about octopuses, squids, and other cephalopods.
Octopus vulgaris
Tom Akkala provides photographs of the common octopus and information on its classification, habitat, adaptation, nutrition, reproduction and interaction with other species.
Sepia officinalis
Factsheet from the FAO on the Common Cuttlefish, its distinguishing features, distribution, habitat and biology.
Sepioteuthis lessoniana: Bigfin Reef Squid
Research project by Amanda Johnson at the University of Wisconsin-LaCrosse.
Sepioteuthis sepioidea: Caribbean Reef Squid
Photographs and information on these squid that are often confused with cuttlefish because their large fins wrap around their mantles.
Vampyroteuthis infernalis: Deep-sea Vampire Squid
Photograph and information on this cephalopod which spends its whole life in the depths of the ocean.
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January 5, 2016 at 19:05:03 UTC
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