The Royal Ontario Museum says it has discovered the oldest-known swimming jellyfish in the fossil record from specimens collected at the Burgess Shale in the Canadian Rockies.
The newly named Burgessomedusa phasmiformis, which means Burgess Shale jellyfish with a ghostly form, was found among the fossils that had been collected from one of the sites at Yoho National Park in British Columbia in the 1980s and 1990s.
Moysiuk said the fossils of the 505-million-year-old jellyfish had been sitting on a shelf at the Royal Ontario Museum for decades until they were studied by his lab mate, Justin Moon, who's lead author on the paper.Moysiuk said the discovery pushes back estimates on the timing of the origin of a group of animals called Cnidaria.
"This discovery is showing us that this evolutionary innovation was already present half a billion years ago in the Cambrian." "Finding such incredibly delicate animals preserved in rock layers on top of these mountains is such a wondrous discovery," co-author Jean-Bernard Caron, curator of invertebrate paleontology at the museum, said in a statement.
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