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Class Reptilia Subclass Synapsida Order Pelycosauria Ophiacodon. -early synapsid (mammal-like reptile) -12 ft long -primitive pelycosaur. Evolution of the Synapsid Line. Cynodont therapsid. advanced pelycosaur. Primitive pelycosaur. Class Reptilia Subclass Synapsida Order Therapsida.
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Class Reptilia Subclass Synapsida Order Pelycosauria Ophiacodon -early synapsid (mammal-like reptile) -12 ft long -primitive pelycosaur
Evolution of the Synapsid Line Cynodont therapsid advanced pelycosaur Primitive pelycosaur
Class Reptilia Subclass Synapsida Order Therapsida Cynodont therapsid -gave rise to Class Mammalia -numerous character transformations
Class Mammalia Subclass Prototheria Order Monotremata Extant Monotremes
Class Mammalia Subclass Prototheria Order Monotremata Duck-billed platypus (Ornithorhyncus)
Class Mammalia Subclass Prototheria Order Monotremata Platypus (Ornithorhyncus)
Class Mammalia Subclass Prototheria Order Monotremata Echidna (Tachiglossus)
Class Mammalia Subclass Prototheria Order Monotremata Echidna (Zaglossus)
Class Mammalia Subclass Theria Infraclass Metatheria Marsupials
Class Mammalia Subclass Theria Infraclass Metatheria Tasmanian devil
Class Mammalia Subclass Theria Infraclass Metatheria Kangaroo
Class Mammalia Subclass Theria Infraclass Eutheria Placental Mammals
Class Mammalia Subclass Theria Infraclass Eutheria Tree shrew (Tupaia) (resembles ancestral primate condition)
Class Mammalia Subclass Theria Infraclass Eutheria Lemur (primitive primate)
Class Mammalia Subclass Theria Infraclass Eutheria Tarsier (living analogy of a slightly later stage in primate evolution)
Class Mammalia Subclass Theria Infraclass Eutheria New World Monkey (Platyrrhine) (spider monkey)
Class Mammalia Subclass Theria Infraclass Eutheria Old World Monkey (Catyrrhine)
Class Mammalia Subclass Theria Infraclass Eutheria Australopithicine
K. Animalia P. Chordata C. Mammalia O. Carnivora (hyenas, lions)
Class Mammalia Subclass Theria Infraclass Eutheria O. Hyracoidea (hyrax, coney)
Class Mammalia Subclass Theria Infraclass Eutheria O. Edentata (Xenarthra) (armadillo)
Class Mammalia Subclass Theria Infraclass Eutheria O. Pholidota (pangolin, scaly anteater)
Asiatic pangolin, or scaly anteater Class Mammalia Subclass Theria Infraclass Eutheria Order Pholidota
Class Mammalia Subclass Theria Infraclass Eutheria O. Dermoptera (flying lemur)
Class Mammalia Subclass Theria Infraclass Eutheria O. Dermoptera (flying lemur)
Class Mammalia Subclass Theria Infraclass Eutheria O. Tubulidentata (aardvark)