Most ancient species exists?

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Stingrays.

Stingrays are even more recent. The fossil record puts them at the Cretaceous period to now. Before stingrays were the guitarfish. And, before guitarfish were the squaliforme sharks (dogfish). Before that, the Galeiforme sharks (horn sharks) Before that, well... doesn't matter since they are no longer known to exist.
 
for fish, i'd say the ceolecanth

Close. Lobe-finned fishes appeared in the Lower Devonian (~395 million yr). But, they were related to today's coelacanth like moles are related to humans. The Latimeria form of coelacanth appeared around the beginning of the Carboniferous period (345 million years). Well after the amphioxus, hagfish, etc that cropped up in the Ordovician (500 million yrs)
 
your like a whirlwind of fish history! it was you who kept fossils and skeletons? if it was you, you should post some pics, would like to see some. i got an old ray tooth fossil, but i guess thats not too impressive lol
 
Heres the most ancient creature I know of.... :ROFL:

joan_rivers-thumb.jpg
 
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