A hagfish fossil found in Illinois, USA, that dates to about 330 million years ago looks quite a lot like today's hagfishes, though, suggesting that these animals may have long since found an ideal ...

It should also improve our understanding of convergent evolution. Elongated body shapes have evolved independently numerous times across the tree of life. Besides Anguilliformes, other clades with eel ...

Lampreys and hagfish are the only surviving groups of ... genes can help researchers better understand early vertebrate ...