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Well, molecular phylogenies are pretty consistent in placing Pholidota
Carnivora and Xenarthra a long way away from either of those.
They are _entirely_ consistent in this.
As for myrmecophagy being unknown in K mammals... I'm not so sure. The
Zalambdalestidae have the postcanines of an insectivore -- but what are
those ever-growing near-horizonal lower incisors doing in the same jaw? It's
clear that those animals were terrestrial hoppers, not tree-climbers like an
aye-aye, which likewise has gnawing incisors but postcanines suitable for
insectivory. Perhaps they gnawed holes into termite mounds???