Transitional fossils of whales (Phylogenetic tree) - Wildlife in the Fossil sites
Classified animal and plant picture guide. Clicking the Organism name 
shows the images, and pointing the Organism name shows the tooltip with three links at the left-top corner.
shows the images, and pointing the Organism name shows the tooltip with three links at the left-top corner.The followings are the transitional fossils of whales excavated from the Cenozoic stratum and extant whales. It describes that the whales have evolved from land to sea. The explanation in brackets is the ages they lived in extinct species. Note that Mya is million years ago. For example, "48.6～40.4 Mya" shows a range between 48.6 and 40.4 million years ago. The italic and bold figures, e.g. 488, show out of the range. The time range is shown in the Geological Time Table. The followings are a part of the Evolutionary Tree.
Primitive even-toed ungulate Indohyus (55.8～40.4 Mya; Semiaquatic)
Primitive whale Pakicetus (55.8～40.4 Mya; Terrestrial)
Primitive whale Ambulocetus (48.6～40.4 Mya; Semiaquatic)
Primitive whale Dalanistes (48.6～40.4 Mya; Semiaquatic) Primitive whale Rodhocetus (48.6～40.4 Mya; Semiaquatic) Primitive whale Protocetus (48.6～37.2 Mya; Aquatic) Primitive whale Georgiacetus (40.4～37.2 Mya; Aquatic) Primitive whale Basilosaurus (40.4～33.9 Mya; Aquatic) Primitive whale Dorudon (40.4～33.9 Mya; Aquatic)
Baleen whales Whale Aetiocetus (33.9～23.03 Mya; Baleen whales with teeth) Whale Janjucetus (28.4～23.03 Mya; Baleen whales with teeth) Whale (Mysticete Whales) (28.4 Mya～) Whale (Pygmy Right Whale) (11.61 Mya～) Whale (Gray Whale) (15.97 Mya～)
Whale (Rorquals) (27.3 Mya～)Toothed whales Whale (Sperm Whales) (15.97 Mya～) Whale (Beaked whales) (20.43 Mya～) Whale River dolphins (30.8 Mya～) Whale (Oceanic dolphins) (19 Mya～) Whale (Porpoises) (15.97 Mya～) Whale (Narwhal,Beluga) (20.43 Mya～)