Strange 'nude' fossil creature from half a billion years ago

Posted by ap507 at Jun 20, 2018 09:21 AM |
Discovery of a new species of sponge-like fossil from the Cambrian Period sheds light on early animal evolution

Issued by University of Leicester on 20 June 2018

Image of the new species of fossil chancelloriid available to download at:

  • New species of Cambrian fossil sea-creature discovered
  • It belongs to an extinct group of animals unlike any alive today
  • Its relatives were small and spiny, but this one was large and ‘nude’
  • New evidence suggests a link to sponges, perhaps solving a 100-year-old mystery

Scientists have discovered the fossil of an unusual large-bodied ‘nude’ sea-creature from half a billion years ago.

The creature belongs to an obscure and mysterious group of animals known as the chancelloriids  – and scientists are unclear about where they fit in the tree of life.

They represent a lineage of spiny tube-shaped animals that arose during the Cambrian evolutionary “explosion” but went extinct soon afterwards. In some ways they resemble sponges, a group of simple filter-feeding animals, but many scientists have dismissed the similarities as superficial.

The new discovery by a team of scientists from the University of Leicester, the University of Oxford and Yunnan University, China, adds new evidence that could help solve the mystery.

The researchers have published their findings in the Royal Society journal Proceedings of the Royal Society B. doi: 10.1098/rspb.2018.0296.  The Leicester authors are Tom Harvey, Mark Williams, David Siveter & Sarah Gabbott.

The new species, named Allonnia nuda, was discovered in the Chengjiang deposits of Yunnan Province, China. It was surprisingly large in life (perhaps up to 50 cm or more) but had only a few very tiny spines. Its unusual “naked” appearance suggests that further specimens may be “hiding in plain sight” in fossil collections, and shows that this group was more diverse than previously thought.

Furthermore, the new species holds clues about the pattern of body growth, with clear links to modern sponges. It is too soon to say the mystery has been solved, but the discovery highlights the central role of sponge-like fossils in the debate over earliest animal evolution.

Dr Tom Harvey, from the University of Leicester’s School of Geography, Geology and the Environment, explained: “Fossil chancelloriids were first described around 100 years ago, but have resisted attempts to place them in the tree of life. We argue that their pattern of body growth supports a link to sponges, reinvigorating an old hypothesis. We’re not suggesting that it’s “case closed” for chancelloriids, but we hope our results will inspire new research into the nature of the earliest animals.”

Dr Peiyun Cong, from the Yunnan Key Laboratory for Palaeobiology, Kunming, China, and The Natural History Museum, UK, added: “The Chengjiang deposits of Yunnan Province continue to reveal surprising new fossils we could hardly have imagined. Together, they provide a crucial snapshot of life in the oceans during the Cambrian explosion.”


Notes to editors:

The study was carried out under the auspices of the MEC International Joint Laboratory for Palaeobiology and Palaeoenvironment, Yunnan University. It was supported by the National Science Foundation of China, grant numbers 41572015 and U1302232, and the Leverhulme Trust, Research Project grant number RPG-2015-441.S.

Cong, P.-Y., Harvey, T. H. P., Williams, M., Siveter, D. J., Siveter, D. J., Gabbott, S. E., Li, Y.-J., Wei, F., & Hou, X.-G. 2018 Naked chancelloriids from the lower Cambrian of China show evidence for sponge-type growth. Proceedings of the Royal Society B, 20180296. doi: 10.1098/rspb.2018.0296

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