Octopus or (Octopuses/octopi/octopodes)
The have a very short lifespan!
Smaller pygmy octopuses live around 6 months (these types are usually your pets) and the Giant Pacific Octopus lives between 3-5 years, possibly longer in colder water !!
The mother octopus lays eggs, stops eating, hides in her den, and withers away ~tear.
Squid or (Squid/squids) - squid can be plural, squids usually refers to multiple species
Skin:
- have chromatophores - produce color changes
- photophores - produce light (believe this if for group communication)
Blood:
- have hemocyanin (instead of hemoglobin) which provides oxidation by using copper (instead of iron) as a carrier of sulfide H2O (instead of oxygen)
- this "blue blood" is less viscous, making it very efficient at oxygenating gills.
Movement:
- Jet propulsion - water pushed through funnel in mantel, very efficent at pushing water over gills.
Cephalopods
gelatinous tissue - filled with ammonium ions - to approximate sea water buoyancy !!
