The following questions are based on your reading assignment, the lecture, and the video productions, "Octopus, Squid and Cuttlefish" and "Search for the Giant Squid."

1. What are the four main groups of extant cephalopods?

2. In what structural ways do squids and octopi differ from a "basic" mollusc such as a chiton?

3. Of the differences referred to in question 3, which can be viewed specifically as adaptations for life as predators?

4. What are chromatophores? What are the other epidermal organs that affect appearance?

5. Why are cephalopods difficult to observe in nature (in their native habitats)?

6. How do cephalopods communicate? That is, what kinds of signals do they use and what kinds of things do they communicate about?

Some scientific names you will hear on the video presentations:

Architeuthis - the giant squid
Dosidicus gigas - the Humboldt squid
Octopus - the octopus. O. dofleini is the so-called "devilfish"
or giant octopus of Puget Sound
Nautilus - the chambered nautilus
Moroteuthis - a large squid in Monterey Canyon
Vampyroteuthis infernalis - the vampire squid