Within the Laurasiatheria, the Erinaceomorpha appears (surprisingly) to be the most divergent branch. Some studies link the Perissodactyla and Ferae in a clade Zooamata; others link Perissodactyla and Cetartiodactyla in a clade of true ungulates. Neither clade is well supported.
Laurasiatheria is also posited to include several extinct orders and superorders:
Resolution among major placental mammal interordinal relationships with genome data imply that speciation influenced their earliest radiations.(Research article)
May 27, 2008; Authors: Björn M Hallström (corresponding author) ; Axel Janke BackgroundRecently the resolution of the mammalian tree made...
Resolution of the early placental mammal radiation using bayesian phylogenetics. (Reports).(Statistical Data Included)
Dec 14, 2001; Deciphering higher level relationships among mammalian orders is a difficult problem in systematics (1-6) and has important...