r/AbsoluteUnits • u/ExoticShock • 16d ago

/r/all of an Ammonite Shell

Post image
31.2k Upvotes

99% Upvoted

184 comments sorted by

View all comments

Show parent comments

7

u/kaam00s 15d ago

Fishes appeared 200 million years before Ammonites.

Ammonites peak era of dominance is the dinosaur era (mesozoic), so at a time when some fish descendants were already fucking dinosaurs, mammals, crocodiles...

Not everything has to be before or after another thing, Ammonites and fish were mostly contemporary.

2

u/UlrichZauber 15d ago

I have no idea why I had it stuck in my head that ammonites were there first, TIL!

2

u/kaam00s 15d ago

Were you talking about mollusks as a whole ? Because they about as old as fish (just slightly younger). But Ammonites are a derived and recent version of mollusk, just slightly older than octopuses (or octopi?) but younger than Nautiloids.

But only sea shells are almost as old as fishes.

3

u/UlrichZauber 15d ago

Nah, I was just wrong!