Bizarre, alien-like creature discovered deep in Atlantic Ocean has 20 gangly arms

News
By published

The bizarre Antarctic feather star was once believed to be one species. Now, scientists have figured out that it's actually eight.

The Antarctic strawberry feather star gets its name from its strawberry-like head
The Antarctic strawberry feather star gets its name from its strawberry-like head (Image credit: McLaughlin, Wilson and Rouse)

Researchers have discovered an otherworldly, 20-tentacled creature lurking in the freezing depths of the Antarctic Ocean.

Resembling an alien or a Lovecraftian horror, the Antarctic strawberry feather star (Promachocrinus fragarius) is one of four new species of crinoids that scientists found at the bottom of the ocean. Crinoids are a group of eerie, perfectly symmetrical creatures that include sea lilies and sea feathers. Sea lilies attach themselves to the ocean floor with a stalk, while sea feathers abandon their stalk upon reaching maturity to waft themselves through the sea with mesmerizing, synchronized swishes of their arms.

Related: What's the weirdest sea creature ever discovered?

To discover the new animals, whose colors range from purple to dark red, researchers trawled a net across patches of the Southern Ocean to collect samples of the creatures. After performing a DNA analysis, the researchers classified the creatures into four new species. 

The 20-armed Antarctic strawberry feather star swims with rhythmic pulses from its arms.

The 20-armed Antarctic strawberry feather star swims with rhythmic pulses from its arms. (Image credit: Gregory W. Rouse)

Intrigued by their findings, the researchers then took a closer look at sea feather specimens that were captured between 2008 and 2017 and were presumed to be P. kerguelensis. Their efforts netted them a discovery of four more new species — bringing the total to eight.

The Antarctic strawberry feather star gets its name from the strawberry-like nub on its body, from which stringlike appendages called cirri protrude anchor the animal to the seafloor. When feather stars take flight, they spread their arms wide and paddle with rhythmic pulses, dancing through the water and capturing plankton with thousands of tiny, mucousy filaments along their arms.

Crinoids like these dominated the young seas of our planet, but they were largely wiped out — along with 95% of life on Earth — during the Permian mass extinction roughly 251 million years ago.

The researchers published their findings July 14 in the journal Invertebrate Systematics.

Ben Turner
Ben Turner
Acting Trending News Editor

Ben Turner is a U.K. based writer and editor at Live Science. He covers physics and astronomy, tech and climate change. He graduated from University College London with a degree in particle physics before training as a journalist. When he's not writing, Ben enjoys reading literature, playing the guitar and embarrassing himself with chess.