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TIL that the hagfish is the only known vertebrate animal with a skull but no spine. Instead it has separate bone sections in its back that function as a spine. They're also capable of absorbing nutrients from the surrounding water directly through their skin.

https://www.nature.com/articles/ncomms1355#:~:text=Abstract,in%20most%20of%20the%20trunk.
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1gp38z1/til_that_the_hagfish_is_the_only_known_vertebrate/