Its elongated muzzle, teeth and skull features are common to the earliest primitive whales.

It is also believed that the primitive whale was incapable of terrestrial locomotion.

A primitive toothed whale called Xenorophus sloanii was preserved in Charleston County.

Marine invertebrates and primitive whales lived there.

The vertebra was later found to belong to Basilosaurus, the primitive Tertiary whale.

In 1849 the complete skeleton of a primitive whale was discovered.

These animals had unusual triangular teeth very similar to those of primitive whales.

Even though they are closely related to these primitive whales, the tusks were gained by convergent evolution.

Ethan Van Sciver describes Ion as resembling a large, primitive whale or fish.

Morawanocetus is an extinct genus of primitive baleen whale from the family Aetiocetidae.