How the Squid Lost Its Shell

The video explores the evolution of cephalopods from the Cambrian period to modern times. It highlights the development of buoyant shells, the rise of ammonites, and the adaptation of coleoids to deep-sea environments. The extinction event at the end of the Cretaceous period led to the survival of coleoids, which evolved intelligence and agility, thriving without shells.

What adaptation did the first cephalopod develop to gain buoyancy?

How did the shell of Plectronaceras contribute to its new form of transportation?

What was the significance of the siphuncle in Plectronaceras?

Describe the evolutionary arms race that occurred between cephalopods and fish during the Devonian period.

What strategies did ammonites adopt to cope with the rise of fast-jawed fish?

How did coleoids adapt to survive in the deep sea?

What role do coleoids play in today's marine ecosystems?