First of all, I think they are an ancestor, but they have evolved into different varieties over time. Just like today's birds, there are birds, chickens, geese and ducks. Their ancestors must all be a kind of creature, but because of the different evolution and environment they encountered, they evolved into different varieties.

I think the ancestors of Zhang Yu and squid should have lived in the deepest part of the sea at first, and they were very large. Later, they produced many offspring, but it was the Jurassic period, and the earth's crust was constantly changing. When the earth's crust sank, the seawater would flow to a lower place; When the earth's crust is upward, many mountains will emerge from the seabed. So during this evolution, their descendants moved to various places with the movement of the crust. Some of them may live in shallow water, while others live in deep sea.

and they will give up their original eating habits in order to survive. For example, they used to prey on large creatures, but now they can only eat some seaweed and other foods because there are no creatures in the shallow sea. So this has also led to great changes in their body shape. But in the end, they are all a kind of ancestor change.

As far as I know, there are octopus, squid, octopus and squid. In fact, Octopus is very similar to Octopus, but Octopus is smaller and Octopus is bigger. They all have eight claws, and there are many suction cups on them. Squid and squid are similar in appearance, their bodies are long and have tentacles on them, and squid is much bigger than squid.

But both octopus and squid have ink, but the octopus has more ink because it has an ink sac under its head. Squid and octopus should both live in the deep sea, and squid and octopus are farmed artificially. It is said that the giant octopus in the deep sea is as high as a five-story building and its claws are tens of meters long, so its compensation ability is very strong.