Based on the most recent paleontological data

reaching about 2 meters in length and weighing approximately 70 to 90 kilograms

Due to its strange morphology and unusual diet

it possessed a second battery of teeth on the pterygoid bones of the palate

More than an extremely fast hunter

Stethacanthus altonensis Variant:Primed Based on the most recentStethacanthus altonensis is an extinct cartilaginous fish from the Early Carboniferous (late Mississippian, approx. 330320 million years ago), belonging to the Symmoriida group within Chondrichthyes, a primitive lineage closely related to early sharks and chimaeras. It is the type species of the genus Stethacanthus, a taxon particularly renowned for one of the strangest anatomical structures known among Paleozoic vertebrates: a modified anterior