They are freakily alien. Hagfish and lampreys (the jawless fish) are in a separate group to all other vertebrates that split off before jaws evolved. Even weird

They are freakily alien. Hagfish and lampreys (the jawless fish) are in a separate group to all other vertebrates that split off before jaws evolved. Even weird fish like seahorses are more closely related to us than these creatures. It's fascinating to me that these species have held on all this time, given that jaws were such a wildly successful adaptation.