Now new data suggests comb jellyfish (ctenophores), which, contrary to appearances, are only distantly related to true jellyfish, win "first", despite comb jellyfish having a more complex differentiated nervous system. They're a neat example of how evolution is not a straightforward march toward greater complexity.

https://www.sciencealert.com/we-might-finally-know-what-the-very-first-animals-looked-like

#biology #life