Research press release



5億年以上前のカンブリア紀の化石を再解釈した結果、動物ではなく藻類の化石であったことが示唆されたことを報告するMartin Smithたちの論文が、Natureに掲載される。この研究知見は、カンブリア紀の動物の進化と生態系における藻類の役割に関する学説に異論を唱えるものとなった。



Reinterpretation of fossils from the Cambrian period, over 500 million years ago, suggest that they were algae, not animals, a Nature paper reports. The findings challenge ideas about animal evolution and the role of algae in Cambrian ecosystems.

The fossil record reveals the evolution of animals during the Cambrian period, but one animal, an aquatic moss-like invertebrate called Bryozoa, has been absent from the strata of this time. In a Nature paper published in 2021, a Cambrian fossil called Protomelission was interpreted to be a bryozoan, but now Martin Smith and colleagues challenge this idea. They describe well-preserved Protomelission-like fossils from the Xiaoshiba Lagerstätte in southern China and conclude that they are a type of benthic, photosynthetic alga, from the order Dasycladales. The findings mean that there are, as yet, no unequivocal bryozoan fossils from the Cambrian period.

The authors also compared the Protomelission-like fossils to those of a geographically widespread group of small, spine-shaped fossils, known as cambroclaves, and concluded that some cambroclaves may also be dasyclad algae. Taken together, the findings indicate that benthic, biomineralizing seaweeds had a more significant contribution in early Cambrian ecosystems than was previously thought.

doi: 10.1038/s41586-023-05775-5

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