The orbits were relatively small and laterally oriented

which is now occupied by sharks and killer whales

The dentition of Protocetus atavus included both pointed teeth for holding onto prey and molars adapted to crushing food

a lineage of ichthyosaurs specialized in aquatic life

Falcatus falcatus Cenozoico The orbits were relatively smallFalcatus falcatus was a small but extraordinary cartilaginous fish that lived during the Early Carboniferous , approximately 325 million years ago , in what is now North America. It is an extinct species of shark belonging to the group of holocephalans, close relatives of current chimaera, although with unique anatomical characteristics that make it one of the most peculiar fish of its time. Its name, Falcatus , derives from Latin and means "curved