450‑Million‑Year‑Old Jellyfish Relative Reveals New Species and Clues to Early Evolution

Fossils often preserve shells, bones, and other hard parts. Soft-bodied creatures tend to disappear without a trace. That’s why a newly identified species discovered near Quebec is so unusual.

Researchers have identified a 450 million year old organism called Paleocane Tentaclea tube-shaped animal with a ring of tentacles, closely related to modern jellyfish. The fossils were discovered about 50 kilometers (about 31 miles) northeast of Quebec City and are described in a new study published in the Journal of Paleontology, which examines the beginnings of marine life from the Ordovician period.

“Soft-bodied organisms do not preserve as well as hard-bodied organisms, which generally makes any soft-bodied fossil more valuable for understanding the history of life,” Louis-Philippe Bateman, co-author of the study, said in a press release.

Learn more: Eggshells fill 30-million-year fossil gap for dinosaur migration

A fossil that fills a missing chapter in jellyfish evolution

Jellyfish and their relatives are among the oldest groups of animals on Earth, with roots stretching back hundreds of millions of years. Discoveries like this are less about adding another species and more about filling in the missing pieces.

To understand where Paleocane Tentacle As a result, the researchers analyzed fossils preserved on 15 slabs of shale limestone, representing approximately 135 individual specimens. Among them, 39 were measured and photographed. The team compared their physical characteristics with those of 69 fossil and living species related to jellyfish, using a set of anatomical traits to determine evolutionary relationships.

This analysis placed Paleocanna closer to the lineage that gave rise to modern jellyfish, helping to connect anchored polyp-like organisms to the free-swimming forms seen today.

What This Ancient Jellyfish Relative Looked Like

Unlike modern jellyfish that drift in water, Paleocanna probably lived anchored to the seafloor, extending upward into the surrounding water.

Each individual occupied a narrow, vertical tube of organic matter, its soft body emerging from the upper opening. Around this opening was a tight group of tentacles. In some specimens, these tentacles appear thin and finger-like, while in others they take on a more feathery shape.

The animals were relatively small, measuring only a few centimeters long, with an elongated body and a central digestive cavity that ended blindly rather than passing through the body. This simple internal structure is consistent with early cnidarian body plans.

Some individuals lived alone, while others formed small groups of multiple tubes attached to their bases, suggesting a flexible lifestyle that could switch between solitary and semi-colonial living.

These features suggest a passive feeding strategy, with tentacles capturing microscopic food carried by ocean currents.

How fossil conditions preserved the characteristics of soft-bodied jellyfish

The preservation of delicate features, including tentacles and soft body structures, depends on how these animals were buried and how quickly this happened.

Fossils are preserved on these same slabs, with many individuals aligned in the same direction. This consistent orientation indicates rapid burial in place, with sediment sealing the organisms before their soft tissues can decompose.

The surrounding environment was likely calm and low in oxygen, conditions that slowed decomposition and limited excavation.

As a result, fossils are preserved as thin, carbon-rich films – a form of fossilization that preserves traces of original organic matter, rarely preserved in Ordovician rocks.

This discovery also highlights how Quebec’s fossil record remains underexplored.

“I’ve often found myself saying that we have a less glamorous fossil record than places like British Columbia or Alberta,” Bateman said. “Findings like this show that there is still a lot to discover and describe here.”

“Once you find them, these types of sites tend to continue to produce spectacular new materials and species for many years, so I expect many more interesting discoveries,” he concluded.

Learn more: Deep-sea corals have been disappearing for more than 1,000 years in the Galapagos – now we can find out why

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