SQUID DISSECTION

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SQUID DISSECTION
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Position your squid

• Place squid in tray, with its dorsal side facing
  up.

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Pigment Cells (chromatophores)

• Peel off a thin, spotted piece of skin.
• Place on a slide observe under the microscope.
• (By stretching and contracting these pigment
  cells, a squid can change color!)

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Tentacles Arms
Notice the difference between arms and
tentacles. Observe the suction cups.
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Beak

• Spread the arms apart to find the beak.
• Use tweezers to remove the beak.
• Move the beak to see how it works!

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Eye

• Compared to other animals, are the squids eyes
  large or small for its body size?
• What does that tell us about where the squid
  lives?

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Pen

• Using both hands, hold your squid by the head and
  the tail. Wiggle it to see how stiff it is.
  (Some squid relatives still have their shells.)
• Now, remove the pen as indicated.

lt-- Its clear and stiff
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Siphon

• Locate the tube-shaped muscle just below the
  head, on the ventral side. This is the siphon.

It works using JET PROPULSION, and is a little
like a water hose.
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CUTTING IT OPEN

• Place the squid ventral side up cut up through
  the mantle.

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Reproductive Systems

• FEMALE You will see a yellow, jelly-like mass
  that looks like Vaseline. This is the substance
  that holds the eggs.
• MALE The male genital duct is a small, white,
  fluid-filled sac in the posterior end of the
  mantle. The sperm are stored in thin tubes in an
  elongated sac behind and along one gill.

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Gills

• Find the gills. These are the long,
  feather-shaped organs that are attached to the
  sides of the mantle and extend along the anterior
  half of the mantle.

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Heart

• When the gills are straightened, they make a V
  shape. At the point of the V shape is a small
  lump. This is the squids heart.
• It is very hard to locate.

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Digestive System

• The long, silvery dark tube on the bottom of the
  liver is the ink sac. Be careful not to break it
  open.
• Locate the stomach and caecum - one white,
  silky-looking tube, like a deflated bladder and a
  coiled sack.
• The bunched up organs that look like human
  intestines are digestive ducts for the squid.
• If possible, open the stomach and examine its
  contents. Many squid will have bits of partially
  digested crustaceans (pink and white pieces), or
  tiny fish scales and bones.

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And finally, the Ink Sac

• Gently cut the ink sac from the organs where it
  is attached.
• CAREFUL Squid ink stains clothes.

What is this ink used for? Alright kiddies you
can write with it.