Lineage of Palaeomeryx
Palaeomeryx
(~20.4 Mya)Palaeomerycinae 
Palaeomerycidae
(~23 Mya)pan-Giraffidae 
Pecora 
pan-Pecora 
Ruminantia 
pan-Ruminantia Cetruminantia 
Artiofabula 
Artiodactyla 
pan-Artiodactyla
(~66 Mya)Euungulata 
Pan-Euungulata Scrotifera Laurasiatheria 
Boreotheria Placentalia 
pan-Placentalia
(~120 Mya)Theria 
Tribosphenida
(~137 Mya)Zatheria
(~158 Mya)Prototribosphenida 
Cladotheria 
Trechnotheria 
pan-Theria 
Mammalia Holotheria 
Mammaliaformes
(~193 Mya)
Mammaliamorpha Prozostrodontia
(~237 Mya)
Chiniquodontoidea 
Probainognathia 
Eucynodontia 
Epicynodontia 
Cynodontia 
Eutheriodontia 
Theriodontia 
Biarmosuchia 
Therapsida 
Sphenacodontoidea 
Sphenacodontia Sphenacomorpha 
Eupelycosauria 
Pan-Mammalia 
Amniota 
Pan-Amniota 
Tetrapoda pentadactyl pan-tetrapods hexadactyl pan-tetrapods Labyrinthodontia Stegocephali Elpistostegalia Panderichthyida Tristichopteriformes Eotetrapodiformes Osteolepidida pan-Tetrapoda Rhipidistia Sarcopterygii Osteichthyes Pan-Osteichthyes Gnathostomata maxillate vertebrates vertebrates with ventral nasal openings Apo-Gnathostomata Cephalaspidomorpha Pan-Gnathostomata Vertebrata pan-Vertebrata Olfactores Chordata pan-chordates with myomeres pan-chordates with branchial arches Vetulicolida pan-Chordata Nephrozoa Bilateria pan-Bilateria Parahoxozoa Myriazoa Metazoa pan-Metazoa Choanozoa Filozoa Holozoa Opisthokonta Obazoa Amorphea Podiata Neokaryotes aerobic mitochondria clade Eukarya parakaryotes Heimdallarchaeota Asgardarchaeota