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"Here, we examine the gut contents of Ediacaran animals using biomarker molecules. We show that 558-million-year (Ma)-old tube worm-like Calyptrina and mollusc-like Kimberella possessed a gut and shared a diet of green algae and bacteria. Despite their ancient age, sterol metabolism within the gut of both organisms was already comparable to extant invertebrates."

#Evolution #Phylogeny #CurrentBiology #Paleontology

https://www.cell.com/current-biology/fulltext/S0960-9822(22)01699-2