This roughly 530-million-year-old critter looks something like an angry minion. And who can blame it? It doesn't have an anus.
fossils have been flattened “like a very sad balloon that’s collapsed in on itself,” says paleontologist Philip Donoghue of the University of Bristol in England. The 3-D reconstruction bringsDonoghue and his colleagues took X-rays of manyfossils representing different stages of the organisms’ decay. The images revealed that an inner skin layer once pushed through pores and extended outward, forming spines.
During fossilization, that inner layer was lost, and the holes were left behind.into its new group, a puzzle remains: the absent anus. It’s not inherently weird — the absence has evolved independently in many species such as jellyfish, which vomit their food waste. But both deuterostomes and ecdysozoans usually have anuses, makingStill, “if you haven’t got an anus,” Donoghue jokes, “you’re not going to be very comfortable anywhere.
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