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Class Cephalopoda

Class Cephalopoda. The “Head-Footed” Mollusks Zoology. Cephalopods Walk on Their Heads…. The Class Cephalopoda includes the octopus , squid, Nautilus , devil fish, and Cuttlefish .

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Class Cephalopoda

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  1. Class Cephalopoda The “Head-Footed” Mollusks Zoology

  2. Cephalopods Walk on Their Heads…. • The Class Cephalopoda includes the octopus , squid, Nautilus , devil fish, and Cuttlefish . • Cephalopoda comes from the Greek words kephale meaning head and podos meaning foot . • Their modified foot is actually concentrated in the head or cephalic region of their body. It forms a funnel that rapidly removes water from the mantle cavity of the body when the cephalopod moves. • The anterior portion of the body is drawn into a circle or crown of tentacles.

  3. Do These Tentacles Make Me Look Fat…. • Cephalopods range upward in size from 2 cm . • The largest invertebrate known on earth is the giant squid (Architeuthis .) It can reach 60 feet in length and weighs nearly a a ton . • The giant squid has the largest eyes in the animal kingdom. They are 25 cm in diameter!

  4. Umm…Have You Seen My Shell? • Most members of Cephalopoda do not have a visible shell . • The Nautilus is the only member of this class that still has a shell. It uses the gas chambers in its shell to remain buoyant in the water. • The squid has a tiny remnant shell left on the inside of its mantle • The octopus has lost its shell completely over the last time.

  5. Moving On Up… • Cephalopods are very fast and agile swimmers. • They swim by expelling water from their mantle .

  6. Judge Me By My Book…Not My Cover • Cephalopods are very complex animals . • They have complex circulatory systems made with a closed series of vessels. • Octopuses_ have very complex nervous systems. They are capable of learned behaviors. Their eyes are very complex with a lens, cornea , and retina. They can see in the water better than a human . • The octopuscan also use its tentacles to detect textures in objects.

  7. Defending My Domain…. • Cephalopods exhibit many complex behaviors. • The octopus and squid can expel ink called sepia as a defensive behavior to fool and evade predators . • Octopus use their sharp beaks and strong tentacles to capture and harm prey. They are one of the ocean’s most powerful predators.

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