Squid%20Dissection%20Lab

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Squid Dissection Lab
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SQUID DISSECTION LAB

• Need NO Gum/Food/Drinks, Hair pulled back out of
  face
• Groups of 4-5. Gather paper towels.
• Gather all needed materialsDissection, Scissors,
  Probe, Forceps Tray (tweezers)

Note Make sure these materials are clean after
your dissection lab today
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SQUID DISSECTION LAB

• Once all materials are gathered then read the
  instructions carefully.
• Collect a squid from your teacher and follow all
  the procedures step by step.

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• Procedures (external anatomy)
• Place the squid with the ventral (front) side
  up.
• Measure the total length of the squid in
  centimeters. record 1
• Stretch out the tentacles and arms and count
  their number record 2
• Examine the tentacles and arms. Look at their
  differences. Where do the tentacles have the
  suction cups? Where does the arm?Why do you
  think there is a difference?
• Notice the body (main part) of the animal do you
  see some spots (chromatophores)? What might be
  their function? record 3
• The body is mostly covered by the mantle (where
  you find its organs). It finally ends with the
  triangular flaps also known as fins. record 4
• Look at the eyes alongside the body. Then notice
  the siphon (water jet) on the collar of the
  squid? record 5

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Pages 701-7
Eye Squid have a well developed eye that allows
them to see as well as people!
Arm Have 8 arms with suction cups
Fin These help squid change direction when
swimming
Tentacle Longer than the arms and have suction
cups at the tip only
Chromatophores These spots change size to change
the squids color for camouflage
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• Procedures (internal anatomy)
• Pull the mantle up with the forceps where the
  siphon is, (it should be loose and easy to pull
  up).  Use scissors to carefully cut from the
  siphon to the fins.  Open the mantle to expose
  the structures inside.
• Locate the silvery black ink sac. Whats its
  function? record 6
• Remove an eye. Make a small cut in the center and
  find round obj. This obj. is the lens. record
  7-answer first 8
• With tweezers, locate the small, folded,
  plastic-like radula between beaks and remove it.
  What is the purpose of it? record 8 (second
  one
• Probe the mantle near the fins with your
  fingernail and find a hard obj. Grasp the obj.
  with forceps and gently pull out. (what is this?
  What is it for?) record 9

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• Procedures (internal anatomy)
• Locate the brain. (very highly developed for an
  invertebrate.
• Locate the stomach, white organ attached to
  esophagus at the end of the mouth.
• Locate the liver (beneath the ink sac).
• Locate the gonad (reproductive organ) near the
  far end of the mantlemales white/yellow color
  females clear color record
  what gender was your squid on the bottom of the
  page
• Locate the gills (feather like). Locate the heart
  (bulb at the end of gill). What color is the
  heart? record

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8. Cutting the Mantle
9. Eyeball of Squid
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11. Ink Sac
11. Writing with the Squids Pen
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17. Gills
4. Suction cups