Protothyrididae
Hylonomus.jpg
Insektivora mirip kadal berkaki pendek dan kecil. Carrol dan lainnya meletakkannya pada kelompok pokok amniota purba. Spesies contohnya Hylonomus

Bacaan lanjut
http://species.wikimedia.org/wiki/Protorothyrididae
Cox, B, RJG Savage, B Gardiner, & D Dixon (1988), Collins Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. Collins Publ. Aus., 312 pp.

deBraga, M & O Rieppel (1997), Reptile phylogeny and the interrelationships of turtles, Zool. J. Linnean Soc. 120: 281-354.
Sumber gambar
http://www.palaeos.com/Paleozoic/Carboniferous/Bashkirian.htm

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