The fish is only found in the waters of Costa Rica's Cocos Island.
Intriguingly, researchers found that males of the species have "quite large" genitalia relative to their tiny size.
Researchers also found another news species of prehistoric shark in Georgia.
The bizarre creatures are colloquially known as "Elvis worms" due to their shiny scales being reminiscent of the King of Rock's famous sequinned suits.
Researchers say the mata mata turtle split into two species during the late Miocene approximately 13 million years ago.
The experiment also led to the team discovering a new species of worm.
Discovery comes 74 years after evolutionary biologist Ernst Mayr predicted fewer than 100 bird species were left to be discovered in the whole world.
The arachnid belongs to a genus, or group of species, known as Loxosceles—which are commonly referred to as recluse spiders, violin spiders, brown spiders, fiddle-backs or reapers.
"I chose this name as I am immensely impressed with the work of this young campaigner," the scientist behind the naming said.
The new species is unique to New Guinea—the world's second-largest island.
Researchers announce there are three different species of electric eel, 250 years after first being found.
Dr. Paul Nathanson was speaking to The Laura Ingraham Podcast about transhumanism.
Despite just being discovered, the new species is already thought to be at risk of extinction.
It's related to an extremely deadly spider, but it's in its own genus and, thankfully, its venom isn't toxic enough to kill a human.
When the crocs reach their full size, they become trapped inside the caves for the rest of their lives.
The flight speed of these bats has posed difficulties for researchers wishing to study them.
There's no other way to access these unexplored areas than to strap on your scuba tanks and jump in.
The pollywog was even bigger than the arachnid.
Scientists have a new way of tracking hundreds of new species.
It was in the deepest sea trench on earth.
This giant rat is gold-colored, a foot and a half long, and was just a rumor among scientists for decades.