Cephalopods: head/foot
Kingdom: Animalia
Phylum: Mollusca
Class : Cephalopoda
Cephalopods
• Cephalopods means “head footed”
• Cephalopods have a well developed
brain and nervous system
called cephalization
• This also gives them large sophisticated
eyes
• Octopus, squid, chambered nautilus,
• cuttlefish.
• Active life, because of their developed brain
•Suckers on arms capture prey (8 arms
and 2 tentacles).
• Swim by forcing water out of mantle cavity
through siphon or funnel (modified foot).
• Have ink to distract predators (ink sack).
• Shell reduced to “pen” in squid
- absent in the octopus
Squid Dissection: What to know for Squiz
External Anatomy
• Arms v.s tentacles
Internal Anatomy
• Gills
• Anterior - posterior • Caecum (stomach)
• Dorsal - ventral
• Ink sack
• Siphon
• Hearts
• Body tube
• Ganglia (brain)
• Fins
• Pen
• Beak and Eye
• Buccal bulb
Squid Dissection Tray
Clean and Dry when finished:
1 probe
1 scissor
1 forceps
1 petri dish
1 petri dish with 10 pins
1 clean pan with clean dry paper
towel
Squid Dissection
Check Dissecting tray
Return clean and dry
Observe under dissecting scope:
Skin, gills, suckers, anything else
you would like