everything in that sentence is stated somewhere else in the realtionships section more clearly so i'm deleting it it means that whales cetacea are considered related to the even toed ungulates artiodactyla and hyraxes hyracoidea are considered related to the elephants proboscidea and sea cows sirenia aardvarks tubulidentata are no longer considered to be related to the anteaters armadillos and sloths xenarthra anonymous