i'm not sure but i think they could be from what I could read. type in ancient fish plecotomus in google search and see what you can find, my pc is acting up so couldnt get into alot of sites
Gars 180 million years +
bichirs at least 100 million years+
Lungfishes 200 million years+
the above can be traced back thru fossil records to the years listed-Anne
there are others but I'm most familiar with the listed