Cephalopods: Notes

1.                       Cephalopods: Types

                 Octopi:

·         Octopi are found in every ocean, and there are more than 100 species.

·         They lack feeding tentacles, and most lack fins.

·         They seize their prey and inject it with a paralyzing toxin before eating it.

·         A female octopus attaches her eggs to rocks and guards them until they hatch; then she dies.

2.       Squid:

·         Squids have eight arms, two long feeding tentacles, and they have a fin on each side of their body.

·         They are found in every ocean and spend their lives swimming, floating, or sometimes resting on the bottom.

·         Squids that live in shallow waters are active hunters.

·         They can swim by shooting water from their mantle cavity or use their two fins to swim.

  

3.       Nautiluses:

·         The nautilus is a shelled cephalopod.

·         Nautiluses have about 90 ARMS, none of which have suckers.

·         They rest during the day and go out to feed during the night.

·         Most cephalopods have a short life span, the nautilus lives for as long as 20 years.

4.       Cuttlefishes:

·         More than 100 species of cuttlefishes, which live in the Mediterranean Sea and other oceans.

·         Like Squids they have eight arms and fins on each sided of their body and two tentacles.

·         They are less active than Squids.

·         Cuttlebone, a chalky, shell-like structure inside their body helps them float.