Zygophyseter is a primitive Sperm Whale that lived during the Miocene epoch of Europe. It belonged to a group called macroraptorial sperm whales, which were highly predatory whales that hunted, mainly, other marine mammals. Zygophyseter had a large beak with many conical-shaped teeth and was able to use echolocation to search for prey. Also, it was probably able to swim faster than a modern day Sperm Whale and it may have used the same tactics as modern day Killer Whales for hunting.
Zygophyseter varolai is the only species within the genus of Zygophyseter and fossils have been found in Italy. Just a single specimen was found, but it was an almost complete skeleton. The species could grow up to 7 meters in length and weighted about 2.000 kg!
Bianucci & Landini, 2006