Younginiformes
240px-Hovasaurus_BW.jpg
Reptil mirip kadal dari era perm.

Bacaan lanjut
http://www.taxonomy.nl/taxonomicon/TaxonTree.aspx?id=646613
http://zipcodezoo.com/Key/Animalia/Younginiformes_Order.asp
Callaway, JM (1997a), Ichthyosauria: Introduction, in JM Callaway & EL Nicholls (eds.), Ancient Marine Reptiles. Academic Press, pp. 3-16.

Sumber gambar
http://www.palaeos.com/Mesozoic/Triassic/Triassic.htm

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