system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 : Can invertebrates be paralyzed?

 Are there any invertebrates that can and cannot be paralyzed?
gpt
Their nervous systems aren’t always so highly centralized so whether you can do catastrophic damage in one spot or not will vary.

In a segmented insect like a bee or ant they do have a spine-esque nerve bundle moving from the head to the thorax and presumably it could suffer the same damage.

A starfish has a decentralized ring-shaped nervous system and you can literally chop them in half with a cleaver to make two independent starfish halves that might grow back into new starfish.

This is the case for a lot of radially symmetric invertebrates like urchins and jellyfish, there is no “brain” located in a “head” controlling everything remotely, and so you can’t sever it.