Palaechthon nacimienti (Wilson and Szalay 1972) ~4cm skull length, middle Palaeocene, was originally and subsequently considered a basal plesiadapiform. Here Palaechthon nests within the clade Glires along with Microsyops and Brachyerix. The premaxilla is missing and may have been nearly toothless, as in the colugo.

This taxon is known from several partial specimens combined to make the incomplete skull drawing shown here: