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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- The Octopus News Magazine Online An online community and news magazine about octopuses, squids, and other cephalopods.
- Ocean Planet: In Search of Giant Squid Myths and facts about the giant squid.
- Cuttlefish: the Sentient Cephalopod This page includes a true story of human-cuttlefish interaction, and several photographs.
- Cephalopoda Classification and images of cephalopods from the Tree of Life project.
- Octopus vulgaris Tom Akkala provides photographs of the common octopus and information on its classification, habitat, adaptation, nutrition, reproduction and interaction with other species.
- 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.
- The Cephalopod Page Personal site of Dr. James B. Wood devoted to the cephalopods with extensive galleries and articles.
- Cephalopod Information from Wikipedia on this class of marine molluscs which includes the squid, cuttlefish and octopus.
- Coleoidea Photographs and information on octopods, squids, cuttlefishes and their relatives from the Tree of Life Web Project.
- Cephalopod International Advisory Council Supports and encourages cephalopod research and communication among cephalopod researchers by means of meetings, workshops, and a newsletter.
- Giant Squid Information about Architeuthus dux and an illustration.
- Vampyroteuthis infernalis: Deep-sea Vampire Squid Photograph and information on this cephalopod which spends its whole life in the depths of the ocean.
- 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.
- Nautilus pompilius: Nautiluses Photographs and information on Nautilus and Allonautilus which are the last living genera of externally shelled cephalopods.
- 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.
- Nautilus: Nautilus pompilius Photographs, videos and information from ARKive.
- Common Octopus: Octopus vulgaris Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
- Giant Cuttlefish: Sepia apama Photographs, videos and information from ARKive.
- North Pacific Giant Octopus: Enteroctopus dofleini Photographs and information from ARKive.
- Curled Octopus: Eledone cirrhosa Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
- Common Cuttlefish: Sepia officinalis Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.