Notably, until its discovery it was supposed that " Thylacosmilus " was a close relative of the family Borhyaenidae, or even a specialized member of the same, having emerged in the late Miocene; the most primitive characteristics and age of " Anachlysictis " suggest a previous origins of the thylacosmilids at the base of the superfamily Borhyaenoidea, whose monophyly needs review.
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