Zygophyseter varolai is an extinct sperm whale that lived during the Tortonian age of the Late Miocene 11.2 to 7.6 million years ago. It is known from...

of five genera: Acrophyseter, Albicetus, Brygmophyseter, Livyatan and Zygophyseter. All species are known by at least a skull, and are informally grouped...

were more common in the Miocene, during which basal lineages (such as Zygophyseter and Brygmophyseter) existed; other fossil genera assigned to the Physeteridae...

Lambert and colleagues estimated the body length of Livyatan using Zygophyseter and modern sperm whales as a guide. The authors opted to use the relationship...

between the cheekbones in comparison to the dimensions of the related Zygophyseter. This makes it the smallest of the macroraptorial sperm whales. Unlike...

†Eudelphis †Hoplocetus †Livyatan †Miophyseter †Rhaphicetus †Scaldicetus †Zygophyseter Kogiidae †Aprixokogia Kogia †Koristocetus †Nanokogia †Platyscaphokogia...

"raptorial"). The other members are Acrophyseter, Albicetus, Livyatan, and Zygophyseter, and these five whales have in common enamel-coated teeth in both the...

†Eudelphis †Hoplocetus †Livyatan †Miophyseter †Rhaphicetus †Scaldicetus †Zygophyseter Kogiidae †Aprixokogia Kogia †Koristocetus †Nanokogia †Platyscaphokogia...

†Eudelphis †Hoplocetus †Livyatan †Miophyseter †Rhaphicetus †Scaldicetus †Zygophyseter Kogiidae †Aprixokogia Kogia †Koristocetus †Nanokogia †Platyscaphokogia...

†Eudelphis †Hoplocetus †Livyatan †Miophyseter †Rhaphicetus †Scaldicetus †Zygophyseter Kogiidae †Aprixokogia Kogia †Koristocetus †Nanokogia †Platyscaphokogia...