If you want to do the lab:If you want to do the lab:

Warm-UpWarm-UpRead the Intro to the Lab.Read the Intro to the Lab.

Answer questions 10-12Answer questions 10-12

Squid Dissection LabSquid Dissection Lab

BiologyBiology

SQUID DISSECTION LABSQUID DISSECTION LAB• Need: Goggles, 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

SQUID DISSECTION LABSQUID 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)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]

Fin: These help squid change direction when swimming

Chromatophores: These spots change size to change the squid’s color for camouflage

Tentacle: Longer than the arms and have suction cups at the tip only

Arm: Have 8 arms with suction cups

Eye: Squid have a well developed eye that allows them to see as well as people!

Pages 701-7

Procedures: (internal anatomy)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)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 mantlemales= 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]

9. Eyeball of Squid

8. Cutting the Mantle

11. Ink Sac

11. Writing with the Squid’s Pen…

4. Suction cups

17. Gills: