Protocetidae family member " Rodhocetus " is considered the first to be fully aquatic.
2.
The families Protocetidae and possibly Remingtonocetidae, are believed to have arisen from a common ancestor with ambulocetids.
3.
Protocetidae were the first group of whales to develop tail flukes, which suggests they were quick, agile predators.
4.
Though Protocetidae as a family possessed tail flukes, it has been suggested that " Artiocetus " did not.
5.
The tooth was later classified as an Archaeoceti " incertae sedis " and even a squalodont odontocete ( a more recent whale ), but can also be assigned to Protocetidae.
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