The discovery of the 555-million-year-old fossil *Uncus dzaugisi* in South Australia confirms their origins in the Precambrian period of the ecdysozoans, and bridges an important evolutionary gap. Photo courtesy of Harvard University

The discovery of the 555-million-year-old fossil *Uncus dzaugisi* in South Australia confirms their origins in the Precambrian period of the ecdysozoans, and bridges an important evolutionary gap. Photo courtesy of Harvard University

The discovery of the 555-million-year-old fossil *Uncus dzaugisi* in South Australia confirms their origins in the Precambrian period of the ecdysozoans, and bridges an important evolutionary gap. Photo courtesy of Harvard University

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