Is the suggestion that octopuses “might be evolutionarily closer to ammonites than previously thought” another way of saying that a complex system developed much earlier than thought?
It would be an interesting thought experiment to consider what the oceans would be like if the formation of shells was difficult. It’s still hard to picture the idea that predation wasn’t as important as dissolution.
Think of it as Noah’s bark. It might explain some things. Let’s see what holes it plugs.