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Pelycosaur cladogram.

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Presentation on theme: "Pelycosaur cladogram."— Presentation transcript:

1 Pelycosaur cladogram

2 PELYCOSAURIA Ophiacodontidae

3 PELYCOSAURIA - Varanopseidae

4 PELYCOSAURIA - Varanopseidae

5 Pelycosauria - Edaphodauridae

6 Pelycosauria - Sphenacodontidae
Dimetrodon

7 Pelycosaur “sails” -- allometry and thermoregulation

8 Pelycosauria - Sphenacodontidae
Haptodus -- probable therapsid ancestor

9 Therapsids “advanced” mammal-like reptiles

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11 CLASS THERAPSIDA Tritylodonts Therocephalians Cynodonts
Tetraceratops early Permian, N. Amer. Phthinosuchus late Permian, Asia Dincephalia late Permian, Asia, S Africa Anomodontia Dicynodonts late Permian - mid Triassic world-wide to early Cretaceous? -- Australia Theriodontia Gorgonopsians late Permian, S. Africa, Asia Tritylodonts late Triassic – mid Jurassic Eurasia, S Africa, N & S America Therocephalians late Permian – early Triassic Asia, Africa, Antarctica Cynodonts late Permian – early Jurassic Africa, Antarctica, Asia, Europe, N & S America

12 Therapsid cladogram

13 Therapsid evolution CYNOGNATHUS SPHENACODONT PELYCOSAUR ANCESTOR

14 THERAPSIDA Tetraceratops -- earliest Therapsid

15 THERAPSIDA Phthinosuchus

16 THERAPSIDA Dinocephalia Titanophoneus

17 THERAPSIDA Dinocephalia Estemmenosuchus

18 THERAPSIDA Dicynodontia Emydops Diictodon Kannemeyeria

19 THERAPSIDA Dicynodontia Early Cretaceous -- Australia ?

20 THERAPSIDA Tritylodontia Tritylodon Kayentatherium

21 THERAPSIDA Gorgonopsia Lycaenops

22 THERAPSIDA Therocephalia Pristerognathus

23 THERAPSIDA Cynodontia Thrinaxodon

24 THERAPSIDA Cynodontia Cynognathus

25 THERAPSIDA Cynodontia Trithelodonts (Ictidosaurs) late Triassic –
early Jurassic

26 Therapsida – advanced cynodonts
Trirachodon Cynognathus

27 Primitive to advanced cynodonts
Kayentatherium early Triassic Probainognathus late Triassic Thrinaxodon Procynosuchus late Permian

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29 Therapsid evolution toward
Mammalian grade

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