Air Breathing in fossil Sea-scorpions
“Highlights
•Data from eurypterids suggest horseshoe crabs were not secondarily aquatic
•A three-dimensionally preserved eurypterid, Adelophthalmus pyrrhae, is described
•Computed tomography reveals the presence of trabeculae on the respiratory lamellae
•Occurrence of trabeculae indicates eurypterids were capable of breathing air”