The oldest animals appear in the fossil record among Ediacaran biota communities. In new research, paleontologists from the Australian National University and elsewhere examined the gut contents of three Ediacaran species — the 558-million-year-old tube worm-like Calyptrina and the mollusk-like Kimberella as well as one of the key Ediacaran animals, Dickinsonia — using biomarker molecules. Their results show that Calyptrina and Kimberella...
