Cephalopods
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A. Organized Body Made of One or More Cells- Taylor S

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A squids body structure

Cephalopods have Feeeding Arms, a Radula, a Pen, and a Shell. An example
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A Octopse body structure

of an Octopus, they have eight rubbery arms. And each arm has a total of 240 suckers. An averge Octopus has about 1,920 suckers on there arms. Cephalopods have no bones in their body. A Cephalopod has a closed circulatory system which means their blood vessels work kinda like ours. their blood contians food and oxygen that moves through the body in series of vessels. Cephalopod aslo means "head-footed". They were named this because they have a well-developed head.












B. Obtain and Use Energy -Ayaz A

Cephalopods get their energy from the food they eat. Sometimes they wait for there prey to pass by to grab them with their tentacles. But usually they would hunt, using their sharp eyes. Octopuses would squirt poison ink from there siphon to paralyze there prey since octopuses don't fight. Cephalopods have a big appetite so they eat many different organisms. There favorite food is crab, but they also like lobsters, clams, and shellfish.They surround there prey with there long tentacles so there meal doesn't swim away. They then drag the prey towards there mouth and use there powerful jaws to eat the organisms. They use most of there energy on swimming because it takes a lot of energy for octopuses and squids to jet through the water.
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An octopuse trying to cosume it's favorite food
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A Squid's jet propulsion (diving)


C. Reproduce- Taylor S
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Two Blue Ring Octopus mating

Cephalopods are sexual. When they are mating the male uses a spermatophore are to transfer a packet of sperm to the female. A female octopus usually mates at the age of one or two years old. After a week or two she finds a den to starts laying her eggs.A cephalopod lays about 1,000-20,000 eggs. It takes about a week or more for the female to lay the eggs. When the eggs are layed they are about the size of a grain of rice. When the female
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A mother Octopus garding her eggs
octopus is laying and taking care of the eggs, she doesn't hunt or eat. By the time the babies are ready to go out on their own, the mother is weak and dies.










D. Grow and Develop- Kegan J

Cephalopods hatch from eggs. After they hatch their mother dies and they survive on their own. At first after they hatch, they can not swim. They float at the level of plankton and feed there. When they are old enough they develop the siphon. The siphon uses water through a jet propulsion system to move. When they are young they can change colors and produce ink. As a cephalopod gains age it also gets more clever therefore it gains the ability to think better causing it to learn the "Mimick" ability. The "Mimick" ability allows it to change color and change shape so it can scare off predators and sometimes roam freely through the ocean.

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A baby cephalopod in its egg














E. Respond to Stimuli- Kegan J

Cephalopods respond to touch mostly. They can change color upon touch. They have excellent sight and they can see things coming in the water. They are known for their ability to solve problems. When they sense danger they first squirt black ink out and change to a black or pale white color to escape. They also change colors upon mood. When they are scared they turn pale white. When they are mad or angry they turn red or orange. Whenever they are sad they turn blue.


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Octopus color change in mood (red = mad/angry)


F. Exchange Gases with the Environment- Ayaz A

Cephalopods trade gases with the water by charging water through their gills. Gills provide the primary mechanism for respiratory gas exchange in Cephalopods. Cephalopods have better gills than other mollusks.Some have small gills and therefore their respiration is faster because water will be passed through quickly when energy is needed. On the other hand, some Cephalopods that spend the majority of their time swimming patiently at the bottom of the ocean, just stay still and rarely move at all, thus they have and need larger gills, along with complex systems to make sure that water is continuously washing through their gills.


Resources:

Castro, Peter, and Michael Huber E. Marine Biology. 4th. New York: McGraw-Hill Companies, Inc., 2003. 468.-Taylor Sheffield

"Cephalopods." Wikipedia. 17.Febuary .2012. <
http://en.wikipedia.org/wiki/Cephalopods#References> - Ayaz Adatia

Gilpin, Daniel. Mollusks. Minneapolis, Minnesota: Compass Point Books, 2006. 48. Print.-Taylor Sheffield

Lauber, Patricia. An Octopus is Amazing. New Yrok: Let's-Read-and-Find-Out Science Book , 1990. 32. Print.-Taylor Sheffield

Tate, Suznne. Oozey Octopus. Nags Head Art,Inc.: Manteo, NC, 2000. Print.-Taylor Sheffield