Bowfins are amazing fish from the eastern side of North America.

They are the only surviving species of Amiiform, an order of fish that was once widespread across the world during the Jurassic period.

The Bowfin is their final representative, stalking through dark and dingy waters in search of fish and crustaceans to catch with their sharp teeth.

They can breathe air if they need to, which allows them to tolerate oxygen-deprived waters and probably survive on land for a few days.

One of the coolest things about them is that the males look after their eggs and larvae for several weeks. The tiny babies swim around in a school and their Pappy hangs around to make sure nothing bad happens.

…Images: Phil’s 1stPix/Uncle Chicken

Japetella is a genus containing one or two species of entirely pelagic octopods. They spend their whole life swimming in the ocean’s mesopelagic zone, surrounded by twilight gloom.

They tend to be entirely transparent so that they cast no shadow that could be seen by sharp-eyed predators. But when bioluminescence strikes them, they instantly become a red-brown colour so as to disappear into the darkness.

In happier times, females develop a ring of photophores around the mouth to attract males. It’s light-up lipstick!

…Images: NOAA/MBARI/Sarah Zylinski, Duke University/Michael Vecchione

This is surely the weirdest sea cucumber in the world!

Pelagothuria natatrix is, as far as anyone knows, the world’s only fully pelagic echinoderm. That means they spend their entire lives swimming through the sea and need never descend to the sea floor.

They live in the deep sea and get around by pulsing their umbrella, much like a jellyfish.

In the middle of the umbrella is their mouth, facing straight upward, and surrounded by oral tentacles that capture food from the water.

The body meanwhile simply dangles beneath.

The entire internet has almost ZERO photos of this thing! Someone needs to start a petition…