Fossilized Fat Shows 550-Million-Year-Old Sea Creature May Have Been the World's First Animal

Ilya Bobrovskiy, the Australian National University
Ilya Bobrovskiy, the Australian National University

A bizarre sea creature whose fossils look like a cross between a leaf and a fingerprint may be Earth's oldest known animal, dating back 558 million years.

As New Scientist reports, researchers from the Australian National University (ANU) made a fortunate find in a remote region of Russia: a Dickinsonia fossil with fat molecules still attached. These odd, oval-shaped creatures were soft-bodied, had rib structures running down their sides, and grew about 4.5 feet long. They were as “strange as life on another planet,” researchers wrote in the abstract of a new paper published in the journal Science.

Another variety of fossil
Ilya Bobrovskiy, the Australian National University

Although Dickinsonia fossils were first discovered in South Australia in 1946, researchers lacked the organic matter needed to classify this creature. "Scientists have been fighting for more than 75 years over what Dickinsonia and other bizarre fossils of the Edicaran biota were: giant single-celled amoeba, lichen, failed experiments of evolution, or the earliest animals on Earth,” senior author Jochen Brocks, an associate professor at ANU, said in a statement.

With the discovery of cholesterol molecules—which are found in almost all animals, but not in other organisms like bacteria and amoebas—scientists can say that Dickinsonia were animals. The creatures swam the seas during the Ediacaran Period, 635 million to 542 million years ago. More complex organisms like mollusks, worms, and sponges didn’t emerge until 20 million years later.

The fossil with fat molecules was found on cliffs near the White Sea in an area of northwest Russia that was so remote that researchers had to take a helicopter to get there. Collecting the samples was a death-defying feat, too.

“I had to hang over the edge of a cliff on ropes and dig out huge blocks of sandstone, throw them down, wash the sandstone, and repeat this process until I found the fossils I was after,” lead author Ilya Bobrovskiy of ANU said. Considering that this find could change our understanding of Earth’s earliest life forms, it seems the risk was worth it.

[h/t New Scientist]

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Andrea Piacquadio / Pexels.com
Andrea Piacquadio / Pexels.com

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Explore Two of Pompeii’s Excavated Homes in This Virtual Tour

A photo of the Pompeii ruins from November 2019.
A photo of the Pompeii ruins from November 2019.
Ivan Romano/Getty Images

It’s been nearly 2000 years since the eruption of Mount Vesuvius decimated Pompeii in 79 C.E., and archaeologists are still uncovering secrets about life in the ancient Roman city. As Smithsonian reports, they’ve recently excavated two homes in Regio V, a 54-acre area just north of the Pompeii Archaeological Park—and you can see the findings for yourself in a virtual tour published by the Italian Ministry of Cultural Heritage and Activities.

The 7.5-minute video comprises drone footage of the houses and surrounding ruins, along with commentary by park director Massimo Osanna that explains what exactly you’re looking at and what types of people once lived there. Osanna’s commentary is in Italian, but you can read the English translation here.

The homes, both modest private residences that probably housed middle-class families, border the Vicolo dei Balconi, or “Alley of the Balconies.” The first is fittingly named “House With the Garden” because excavators discovered that one of its larger rooms was, in fact, a garden. Excavators pinpointed the outlines of flowerbeds and even made casts of plant roots, which paleobotanists will use to try to identify what grew there. In addition to the garden and vibrant paintings that feature classic ancient deities like Venus, Adonis, and Hercules, “House With the Garden” also preserved the remains of its occupants: 11 victims, mostly women and children, who likely took shelter within the home while the men searched for a means of escape.

Across the street is “House of Orion,” named for two mosaics that depict the story of Orion, a huntsman in Greek mythology whom the gods transformed into the constellation that bears his name today.

“The owner of the house must have been greatly attracted to this myth, considering it features in two different rooms in which two different scenes of the myth are depicted,” Osanna says. “It is a small house which has proved to be an extraordinary treasure chest of art."

To see what Pompeian houses would’ve looked like before Mount Vesuvius had its fiery fit, check out this 3D reconstruction.

[h/t Smithsonian]