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Cephalopods
Series of fact sheets on this class of invertebrates that includes over 700 species "divided into the subclasses Coleoidea (cuttlefish, squid, and octopus) and Nautiloidea (nautiluses)." Provides a general overview of cephalopods, and more detailed information about the chambered nautilus, the giant Pacific octopus, and the Humboldt (jumbo) squid. From the Smithsonian National Zoological Park.
http://nationalzoo.si.edu/Animals/Invertebrates/Facts/cephalopods/

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