Octopus:

·         Crabs

·         Whelks

·        
Small fish

·         Mollusks

·         Clams

·         Lobsters

·         Sea worms

·         Shrimp

·        

Big octopus can sometimes go after sharks.

Squid:

·        
Hokie

·        
Orange roughly

·         Shrimp

·        
Sometimes young sharks and whales

Cuttlefish:

·        
Clownfish

·         Triggerfish

·         Gobies

·        
Blennies

·        
Wrasse

·         Cardinal fish

·        
Seahorses

·         Damsels

·        
Tangs

·         Crabs

·        

Shrimp

Nautilus:

·         Small fish

·         Crabs

·         Crustaceans

·        



Carrion

Cephalopod Anatomy

Organs:

·         High brain-to-body mass ratio; most intelligent of the invertebrates.

·         Three hearts.

·         Gills and Siphon for breathing and jet-propulsion respectively.

·         Gonads typically at the top of the mantle (head).

·         Most have ink sacs.

·         Have bird-like beaks, and most have radulas (multiple rows of up to nine teeth).

·         Large, highly developed eyes, yet they are colorblind.

Appendages

·         Most have at least eight arms and two or more tentacles.

·         Arms are lined with suction cups and tentacles usually have the suckers only at the tips.

·         “Cephalopod” means “head-foot.”

Size and Color

·         As big as 60 feet (Giant Squid) to as little as half an inch (Pygmy Squid).

·         Most have chromatophores which stretch and squash to change color.

Nautiluses

·         Still retain exterior shells.

·         Have about 90 arms that lack suckers but are rather sticky.

Cephalopods and Their Habitats

Octopus-

·         Usually live in rocks, coral, or burrows.

·         Because they’re invertebrates, they are able to squeeze through narrow passages to find homes.

·         Homes provide protection and they allow the females to lay their eggs.

Squid-

·         Live in warm tropic waters while some live in colder waters.

·         They are found near the sea floor, which is about 10,000 feet below sea level.

·         They are generally found in four oceans.

·         They don’t migrate for new homes.

Mollusks-

·         Some are found on shallow coastal areas while others are In deep ocean.

·         Usually are found where volcanic sediments come in contact with cold waters.

·         They bury themselves in sand, silt, mud, and gravel.

·         They are substrates to help support their heavy shells.

Cuttlefish-

·         Usually found near the Mediterranean, Baltic, and North Sea coasts.

·         They live in temperate waters where the cuttlefish are most comfortable.

·         Use their camouflage to blend in with their habitat to hide from predators.

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. 

Craw fish Dissection

Squid Dissection

Buoyancy

buoyancy is an upward force exerted by a fluid that opposes the weight of an immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid.