Could an aquatic mammal develop an eel-like fin as opposed to a fluked structure?

Anatomically speaking, could an aquatic mammal develop a horizontal fin that instead of being localized at the end of the tail extends up the sides in a similar manner to how an eel's fin extends up the top and bottom? Particular concerns are whether some sort of rigid support is necessary for that sort of fin and if so, what it would come from in a mammal. For that matter, do any mammals have enough vertebrae to make anguilliform swimming practical?

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Could an aquatic mammal develop an eel-like fin as opposed to a fluked structure?

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