Science

500-million-year-old fossils solve a centuries-old mystery in the evolution of life on Earth

500-million-year-old fossils solve a centuries-old mystery in the evolution of life on Earth
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Artistic reconstruction of Gangtoucunia Aspera

Artist’s reconstruction of Gangtoucunia aspera as it would have appeared on the Cambrian seabed about 514 million years ago. The person in the foreground has had part of the skeleton removed to show the soft polyp inside the skeleton. Photo credit: Reconstruction by Xiaodong Wang

Scientists have finally solved a centuries-old mystery in the evolution of life on Earth, revealing what the first animals to form skeletons looked like. This discovery was possible because of an exceptionally well-preserved collection of fossils unearthed in eastern Yunnan Province, China. The results of the research were published in the journal on November 2nd Proceedings of the Royal Society B.

During an event called the Cambrian Explosion some 550-520 million years ago, the first animals to build hard and sturdy skeletons suddenly appeared in the fossil record in a geological blink of an eye. Many of these early fossils are simple hollow tubes, ranging in length from a few millimeters to many centimeters. However, what type of animals produced these skeletons was almost entirely unknown, as they lack the preservation of the soft tissues necessary to identify them as belonging to the major groups of animals extant today.

Gangtoucunia aspera diagram

Fossil specimen (left) and diagram (right) of Gangtoucunia aspera preserving soft tissue, including gut and tentacles. Photo credits: Luke Parry and Guangxu Zhang

Four copies of Gangtoucunia aspera with soft tissue still intact, including gut and mouthparts, are included in the new collection of 514-million-year-old fossils. These show that this species had a mouth lined with a ring of smooth, unbranched tentacles about 5 mm (0.2 in) long. It is likely these were used to sting and capture prey such as small arthropods. The fossils also show this Gangtoucunia had a cecum (open at only one end) divided into internal cavities that filled the length of the tube.

These are traits now found only in modern jellyfish, anemones, and their close relatives (known as cnidarians), organisms whose soft tissues are exceedingly rare in the fossil record. The study shows that these simple animals were among the first to build the hard skeletons that make up much of the known fossil record.

According to the researchers Gangtoucunia would have looked similar to modern scyphozoan jellyfish polyps, with a hard tubular structure anchored to the underlying substrate. The tentacled mouth would have extended outside the tube but could have been retracted into the tube to avoid predators. However, unlike living jellyfish polyps, the tube is off Gangtoucunia was made from calcium phosphate, a hard mineral that makes up our own teeth and bones. The use of this material to build skeletons in animals has become less common over time.

Mouth region Gangtoucunia aspera

Close-up of the mouth region of Gangtoucunia aspera showing the tentacles that would have been used to capture prey. Photo credits: Luke Parry and Guangxu Zhang

Corresponding author Dr. Luke Parry, Department of Earth Sciences,[{” attribute=””>University of Oxford, said: “This really is a one-in-million discovery. These mysterious tubes are often found in groups of hundreds of individuals, but until now they have been regarded as ‘problematic’ fossils, because we had no way of classifying them. Thanks to these extraordinary new specimens, a key piece of the evolutionary puzzle has been put firmly in place.”

The new specimens clearly demonstrate that Gangtoucunia was not related to annelid worms (earthworms, polychaetes and their relatives) as had been previously suggested for similar fossils. It is now clear that Gangtoucunia’s body had a smooth exterior and a gut partitioned longitudinally, whereas annelids have segmented bodies with transverse partitioning of the body.

The fossil was found at a site in the Gaoloufang section in Kunming, eastern Yunnan Province, China. Here, anaerobic (oxygen-poor) conditions limit the presence of bacteria that normally degrade soft tissues in fossils.

Gangtoucunia aspera Fossils

Fossil specimen of Gangtoucunia aspera preserving soft tissues, including the gut and tentacles (left and middle). The drawing at the right illustrates the visible anatomical features in the fossil specimens. Credit: Luke Parry and Guangxu Zhang

PhD student Guangxu Zhang, who collected and discovered the specimens, said: “The first time I discovered the pink soft tissue on top of a Gangtoucunia tube, I was surprised and confused about what they were. In the following month, I found three more specimens with soft tissue preservation, which was very exciting and made me rethink the affinity of Gangtoucunia. The soft tissue of Gangtoucunia, particularly the tentacles, reveals that it is certainly not a priapulid-like worm as previous studies suggested, but more like a coral, and then I realised that it is a cnidarian.”

Although the fossil clearly shows that Gangtoucunia was a primitive jellyfish, this doesn’t rule out the possibility that other early tube-fossil species looked very different. From Cambrian rocks in Yunnan province, the research team has previously found well-preserved tube fossils that could be identified as priapulids (marine worms), lobopodians (worms with paired legs, closely related to arthropods today), and annelids.

Co-corresponding author Xiaoya Ma (Yunnan University and University of Exeter) said: “A tubicolous mode of life seems to have become increasingly common in the Cambrian, which might be an adaptive response to increasing predation pressure in the early Cambrian. This study demonstrates that exceptional soft-tissue preservation is crucial for us to understand these ancient animals.”

Reference: “Exceptional soft tissue preservation reveals a cnidarian affinity for a Cambrian phosphatic tubicolous enigma” by Guangxu Zhang, Luke A. Parry, Jakob Vinther and Xiaoya Ma, 2 November 2022, Proceedings of the Royal Society B Biological Sciences.
DOI: 10.1098/rspb.2022.1623

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