Paleontologists have examined new microfossils of a Cambrian microscopic animal called Saccorhytus coronarius, which was previously interpreted as a deuterostome, a large group of the animal kingdom which includes vertebrates (like humans). An artist’s reconstruction of Saccorhytus coronarius. Image credit: Liu et al. Saccorhytus coronarius is an ellipsoidal marine animal with a large mouth surrounded by spines and holes. It was about a millimeter...
