1. Quadrupedal Locomotion: Both Dorudon whales and humpback whales exhibit evidence of quadrupedal locomotion during their evolutionary history. While modern humpback whales are exclusively aquatic, fossilized remains of Dorudon show the presence of functional, weight-bearing hind limbs, indicating terrestrial or shallow-water habitats.
2. Elongated Body Shape: Dorudon whales and humpback whales share a relatively elongated body shape compared to other cetaceans. This morphology provides them with greater agility and maneuverability in their respective marine environments.
3. Flukes: Although structurally different, both Dorudon whales and humpback whales possess flukes at the posterior (rear) end of their bodies. In Dorudon, the flukes may have been smaller and used primarily for stabilization, whereas humpback whales use their large, distinctive flukes for propulsion and powerful breaches out of the water.
4. Teeth: While modern humpback whales are filter feeders with baleen plates instead of teeth, Dorudon whales had functional, sharp, pointed teeth, resembling those of terrestrial carnivores. This feature suggests a predatory lifestyle for Dorudon, a trait that has since been modified in the lineage leading to extant whales.
5. Transitional Species: Both Dorudon whales and humpback whales represent significant stages in cetacean evolution. Dorudon is often considered a primitive or transitional whale, showcasing the intermediate form between fully terrestrial ancestors and adapted cetaceans. Humpback whales, although fully aquatic, exhibit adaptations that reflect the evolutionary transitions experienced by their ancestors from land to water.
It's important to note that Dorudon whales existed over 40 million years ago, while humpback whales belong to a much later period. Despite these gaps in their eras, they offer vital glimpses into the diverse forms and capabilities of cetaceans throughout geological history.