Cetancodontamorpha is a total clade of artiodactyls defined, according to Spaulding et al., as Whippomorpha "plus all extinct taxa more closely related to extant members of Whippomorpha than to any other living species".

Subgroup list
Siamotherium
Achaenodon
Cetaceopterygia (Entelodontidae, Sunia, Hippopotamoidea, Mesonychia, Andrewsarchus, Raoellidae, and Cetaceans)