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The Importance of Slime

Nearly every evolutionary question can find an answer in mucus. The post The Importance of Slime appeared first on Nautilus.

The weather in Morro Bay, California is too good, the coastline too picturesque, and the wildlife seem to have waltzed straight out of a Disney film. Sea otters play in the waves with their young, herons bask on the beach, and seals stretch their plump bellies in the sun. And yet amid the tranquility of Morro Bay lurks a monster straight from H.P. Lovecraft’s playbook, as slimy as a creature from Sartre’s nightmares. It doesn’t get much more extraterrestrial than this. Two hearts? Tentacles coming out of its head? Four rows of pointed teeth? A vertical smile on its face? But would you call it a smile? Or a face? Why, it’s the hagfish of course.

The writer and Nobel Prize winner John Steinbeck was not a fan of the monster. He found it “disgusting” and “nauseating,” while noting that his close friend, the marine biologist Ed Ricketts, “did not feel this, because the hagfish has certain functions which he found fascinating.” And I find them fascinating too.

Threatened hagfish can bind vast quantities of water into a dense slime in a split second.

The hagfish has certain peculiarities, including its German name, (slime eel), which is misleading, since this elongated creature is not an eel—but neither is it a true fish, as its English name suggests. In fact, hagfish, like confirmed the unique evolutionary journey of cyclostomes. It was the first time a fossilized hagfish emerged, 100 million years old and fantastically well preserved, complete with traces of slime, like a “sneeze in stone.” It underlined the close relationship between these creatures and lampreys and proved that they are not primitive ancestors of us vertebrates, as some scientists had previously assumed.

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