Reptile Evolution
 
Vertebrata
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Tetrapoda
Basal Tetrapoda
Temnospondyli
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Reptilia/Amniota
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Archosauromorpha
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Urumqia clade
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Fenestrasauria • Pterosauria
Protosquamata
Squamata
 
Ianthasaurus
Ianthasaurus haresti (Reisz and Berman 1986) was a contemporary and a smaller sister toDimetrodon with a skull similar to that of Haptodus. The dorsal spines had small knobs as in Edaphosaurus.
 
Ianthodon
Ianthodon schultzei (Spindler, Scott and Reisz 2015; Late Carboniferous) nests as a basal edaphosaur despite its meat-eating teeth and lack of tall neural spines. It was derived from a sister to Haptodus.
 

Reisz RR andBerman DS 1986. Ianthasaurus hardestii n. sp., a primitive edaphosaur (Reptilia, Pelycosauria) from the Upper Pennsylvanian Rock Lake Shale near Garnett, Kansas. Canadian Journal of Earth Sciences 23(1): 77–91.

Spindler F, Scott D. and Reisz RR 2015. New information on the cranial and postcranial anatomy of the early synapsid Ianthodon schultzei (Sphenacomorpha: Sphenacodontia), and its evolutionary significance. Fossil Record 18:17–30.

wiki/Ianthasaurus
wiki/Ianthodon
 
Synapsida
Elliotsmithia - Apsisaurus
Aerosaurus
Varanops
Varanodon
Varanosaurus
Archaeothyris
Ophiacodon
Haptodus
Edaphosaurus
Ianthasaurus
Echinerpeton
Secodontosaurus
Dimetrodon Sphenacodon
 

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