"Over time, hagfish lost the genes related to developing organs like eyes and cartilage," said Smith. "However, we saw hagfish have also expanded a few gene families, including slime-producing genes." ...

The hagfish is a slime-emitting ocean-dweller that's remained unchanged for 300 million years--and it shows. It has a skull (but no spine), velvet smooth skin, and a terrifying pit of a mouth that ...