Scientists Found a Perfect and Strange Ball Structure Inside 80-Million-Year-Old Fossils That Shouldn’t Exist

Paleontologists have spotted unusual ball-like shapes in 80-million-year-old marine fossils, pointing to a design that feels surprisingly modern. These structures, similar to forms seen in carbon molecules, may have helped ancient species survive in risky ocean environments.

Crinoids, relatives of starfish and sea urchins, have been around for hundreds of millions of years. Their skeletons are made of calcite plates that fit together in complex ways, a feature that has long made them useful for understanding ancient marine life.

According to research published in Palaeontology, two extinct species, Marsupites testudinarius and Uintacrinus socialis, show unusually rounded skeletal shapes. These findings stand out for both their form and their possible role in environments shaped by predation and competition.

Molecular Geometry Found in Fossils

What stands out most is the geometry. The fossils reveal spherical arrangements that resemble fullerene and fulleroid structures known in chemistry. According to Dr. Aaron Hunter from the University of Western Australia and the University of Cambridge, this kind of structure had never been seen in fossils before. The buckminsterfullerene comparison comes from how the plates snap together into almost perfect spheres.

“The structures are also found in the carbon molecule buckminsterfullerene but this is the first time we have found such a structure in fossils and it still remains a mystery why these successful structures did not evolve again.”

In Marsupites testudinarius, a smaller number of large plates creates a solid, stable form. In Uintacrinus socialis, many smaller plates form a more complex dome. Different approaches, but a similar overall shape.

Built to Survive Predators

Life in the Cretaceous period was not exactly calm. Shallow seas were filled with predators like fish and crabs, creating constant pressure on marine species to adapt. As explained by Dr. Hunter:

“Crinoids were in a very dangerous place millions of years ago when the oceans were shallower and they shared them with predators such as crabs and fish,” he said. “Survival was critical and the ball-like structures, able to withstand very heavy loads, formed around them to protect them from the harms of the ocean and aid buoyancy.”

The spherical structures likely helped in two ways. They could handle pressure, offering some protection, and they may also have helped with buoyancy. According to the researchers, this could allow the animals to stay on the seafloor or float away when needed.

A Design That Spread Fast, and Then Vanished

As said in the study, published in the journal Palaeontology, these ball-like creatures were not limited to one area. Fossils have been found in chalk deposits from Texas to Western Australia (specifically Kalbarri), suggesting they were able to spread widely across ancient oceans.

“These animals could form a snowshoe to sit on the bottom of shallow oceans or float and relocate to safer places,” added Dr. Hunter.

Even so, this design did not stick around. As stated by the research team, similar structures do not appear in later species, and the reason is still unknown. That gap in the fossil record leaves an open question about why an apparently effective design disappeared.

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