Pelycosaur cladogram - Biology Courses Server
Pelycosaur cladogram - Biology Courses Server
Pelycosaur cladogram - Biology Courses Server
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<strong>Pelycosaur</strong> <strong>cladogram</strong>
PELYCOSAURIA Ophiacodontidae<br />
Ophiacodon
PELYCOSAURIA - Varanopseidae<br />
Varanops
PELYCOSAURIA - Varanopseidae
<strong>Pelycosaur</strong>ia - Edaphodauridae
<strong>Pelycosaur</strong>ia - Sphenacodontidae<br />
Dimetrodon
<strong>Pelycosaur</strong> “sails” -- allometry and thermoregulation
<strong>Pelycosaur</strong>ia - Sphenacodontidae<br />
Haptodus -- probable therapsid ancestor
Therapsids<br />
“advanced” mammal-like reptiles
CLASS THERAPSIDA<br />
Tetraceratops early Permian, N. Amer.<br />
Phthinosuchus late Permian, Asia<br />
Dincephalia<br />
late Permian, Asia, S Africa<br />
Anomodontia<br />
Dicynodonts<br />
late Permian - mid Triassic<br />
world-wide<br />
to early Cretaceous? -- Australia<br />
Theriodontia<br />
Gorgonopsians<br />
late Permian, S. Africa, Asia<br />
Tritylodonts<br />
late Triassic – mid Jurassic<br />
Eurasia, S Africa, N & S America<br />
Therocephalians<br />
late Permian – early Triassic<br />
Asia, Africa, Antarctica<br />
Cynodonts<br />
late Permian – early Jurassic<br />
Africa, Antarctica, Asia, Europe,<br />
N & S America
Therapsid <strong>cladogram</strong>
Therapsid evolution<br />
CYNOGNATHUS<br />
SPHENACODONT<br />
PELYCOSAUR<br />
ANCESTOR
THERAPSIDA<br />
Tetraceratops -- earliest Therapsid
THERAPSIDA<br />
Phthinosuchus
THERAPSIDA<br />
Dinocephalia<br />
Titanophoneus
THERAPSIDA<br />
Dinocephalia<br />
Estemmenosuchus
THERAPSIDA<br />
Dicynodontia<br />
Diictodon<br />
Kannemeyeria<br />
Emydops
THERAPSIDA<br />
Dicynodontia<br />
Early Cretaceous -- Australia ?
THERAPSIDA<br />
Tritylodontia<br />
Kayentatherium<br />
Tritylodon
THERAPSIDA<br />
Gorgonopsia<br />
Lycaenops
THERAPSIDA<br />
Therocephalia<br />
Pristerognathus
THERAPSIDA<br />
Cynodontia<br />
Thrinaxodon
THERAPSIDA<br />
Cynodontia<br />
Cynognathus
THERAPSIDA<br />
Cynodontia<br />
Trithelodonts (Ictidosaurs)<br />
late Triassic –<br />
early Jurassic
Therapsida – advanced cynodonts<br />
Trirachodon<br />
Cynognathus
Primitive to advanced cynodonts<br />
Kayentatherium<br />
early Triassic<br />
Probainognathus<br />
late Triassic<br />
Thrinaxodon<br />
early Triassic<br />
Procynosuchus<br />
late Permian
Therapsid evolution toward<br />
Mammalian grade
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