Surprisingly, after the Early Cretaceous taxonomic diversity recorded in Europe, which
probably is largely an artifact of inadequate taxonomy and inflation of taxa, multituberculate
mammals became extremely scarce in the Late Cretaceous in this continent, being reported
exclusively from the uppermost Cretaceous continental deposits of the so-called "Hateg
Island" in Transylvania, Romania. Such mammals have been documented from the Hateg
and Rusca Montana sedimentary basins, as well as from the southwestern area of the
Transylvanian Basin. All these records belong to the endemic family Kogaionidae. The
present paper reports additional data related to the smallest Cretaceous kogaionid,
Barbatodon oardaensis Codrea, Solomon, Venczel & Smith, 2014 based on a series of
new isolated teeth recovered mainly from the type locality, Oarda de Jos (Oarda A).
Furthermore, the fossil localities Oarda B and Valioara are other new occurrences
for the species. Based on this new material, the intraspecific variability of B. oardaensis
is confirmed and its presence is attested in the three basins. Details related to
the diversity of the "Hates Island" kogaionids are also provided.
