The Late Cretaceous " Kryptobaatar " and the extant echidnas ( family Tachyglossidae ) all sport extratarsal spurs on their hind feet.
2.
Assuming that the " Kryptobaatar " and Tachyglossidae spurs are homologous, they were a feature of their tribosphenidan last common ancestor, so we can tentatively conclude that they were present among the Early Cretaceous Eobaataridae & mdash; its descendants & mdash; as well.
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