Transcript Squid Dissection - Mr. Wells` wikispace

If you want to do the lab:
Warm-Up
Read the Intro to the Lab.
Answer questions 10-12
Squid Dissection Lab
Biology
SQUID DISSECTION LAB
• Need: Goggles, NO Gum/Food/Drinks, Hair
pulled back out of face
• Groups of 4-5. Gather paper towels.
• Gather all needed materials
Dissection, Scissors, Probe, Forceps
Tray
(tweezers)
Note: Make sure these materials are clean after your
dissection lab today
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.
We will go over each step as a class.
Pay close attention and ask questions
whenever you have them by raising your
hand.
Procedures: (external anatomy)
1.Place the squid with the ventral (front) side up.
2.Measure the total length of the squid in centimeters. [record #1]
3.Stretch out the tentacles and arms and count their number [record #2]
4.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?
5.Notice the body (main part) of the animal… do you see some spots
(chromatophores)? What might be their function? [record #3]
6.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]
7.Look at the eyes alongside the body. Then notice the siphon (water
jet) on the collar of the squid? [record #5]
Pages
701-7
Arm: Have 8
arms with
suction cups
Tentacle:
Longer than
the arms and
have suction
cups at the
tip only
Eye: Squid have a well
developed eye that
allows them to see as
well as people!
Fin: These
help squid
change
direction when
swimming
Chromatophores:
These spots
change size to
change the squid’s
color for
camouflage
Procedures: (internal anatomy)
8.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.
9.Locate the silvery black ink sac. What’s its function? [record #6]
10.Remove an eye. Make a small cut in the center and find round obj. This
obj. is the lens. [record #7]
-answer first #8
11.With tweezers, locate the small, folded, plastic-like radula between
beaks and remove it. What is the purpose of it? [record #8 (second one]
12.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]
Procedures: (internal anatomy)
13. Locate the brain. (very highly developed for an invertebrate.
14. Locate the stomach, white organ attached to esophagus at the end of
the mouth.
15. Locate the liver (beneath the ink sac).
16. Locate the gonad (reproductive organ) near the far end of the mantle
males= white/yellow color
&
females= clear color
[record what gender was your squid on the bottom of the page]
17. Locate the gills (feather like). Locate the heart (bulb at the end of gill).
What color is the heart? [record]
8. Cutting the Mantle
9. Eyeball of Squid
11. Ink Sac
11. Writing with the Squid’s Pen…
17. Gills:
4. Suction cups