Within Fereuungulata, Carnivora and Pholidota form the clade Ferae while Cetacea and Artiodactyla form Cetartiodactyla. There is uncertainty regarding the placement of Perissodactyla; a grouping with Ferae has been proposed as the clade Zooamata while a grouping with Cetartiodactyla has been proposed as the clade Euungulata ("true ungulates").
- Pegasoferae, a proposed clade uniting Chiroptera, Perissodactyla, Carnivora and Pholidota, which is less supported
- Waddell et al. (1999). "Using Novel Phylogenetic Methods to Evaluate Mammalian mtDNA, Including Amino Acid-Invariant Sites-LogDet plus Site Stripping, to Detect Internal Conflicts in the Data, with Special Reference to the Positions of Hedgehog, Armadillo, and Elephant". Systematic Biology 48 (1): 31–53. doi:10.1080/106351599260427. Retrieved 4 October 2011.
- Zhou, X. et al. (2011). "Phylogenomic analysis resolves the interordinal relationships and rapid diversification of the Laurasiatherian mammals". Systematic Biology 61 (1): 150–64. doi:10.1093/sysbio/syr089. PMC 3243735. PMID 21900649. Retrieved 3 October 2011. (Advance Access; published online 7 September 2011) "Our reconstructions resolve the interordinal relationships within Laurasiatheria and corroborate the clades Scrotifera, Fereuungulata, and Cetartiodactyla."
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