For you Killifish fans

[gwand]

Fossil killifish: New findings reveal unforeseen diversity

Killifish, or egg-laying toothcarps, are known for their ecological adaptability and species diversity. Two families of killifish exist in Europe today: the highly species-rich Aphaniidae and the relatively species-poor Valenciidae, which has just three species. How these differences in species...

phys.org

 

[GaryE]

Hmm, our fish are even older than some of us who post here.