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122 Oceans Sciences
Squids are generally found all over the
world. A great number of them are located
in the pacific ocean.
Squids are great examples of cephalopods, where
their heads, tentacles and eyes are developed.
They also have eight short arms, near their mouth
and small fins near the ends of their tails.
Many of these creatures
have special pigment
cells called
chromatophores in
their skin. By controlling
the size of the cells they
can vary their color and
even create changing
Chromatophores are connected to the nervous system,
and their size is determined by muscular contractions.
With a closed circulatory system, the
squid has two branchial hearts.
These two hearts are located at the
base of the gills which send
unoxygenated blood through the
gills. The third ventricular heart then
pumps this oxygenated blood
throughout the body.
Squids are
quite shy
creatures, and
tend to live in
deep waters
ranging from
1000 to 2000
Squid eat fish, crustaceans for instance, shrimp, and
other squid.
Squids have a tongue, which is known as the Radula.
Most squid have
a sac containing
that it places in
the mantle of the
female squid
where the sperm
is released into
the mantle cavity.
When food is taken up by cells lining the
digestive glands arising from the stomach,
and then is passed into the blood.
Undigested materials are compressed and
packaged, then discharged through the
anus into the mantle cavity and are carried
away in the water currents.