Some trilobites sported dual digestive tracts
CT scans reveal ancient arthropods with forked entrails
VANCOUVER — Some trilobites scurrying across the seafloor around 500 million years ago probably sported two-lane digestive tracks, new research shows.
Michael Rutana of Ohio State University scrutinized eight trilobite fossils (one shown, left), ranging from 1.8 to 10.1 centimeters long from the Cambrian and Ordovician periods.