Vieraella Herbsti
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Katak sejati terpurba dari zaman Yura awal, sekitar 188-213 juta tahun lalu.

Bacaan lanjut
Griffiths, Richard A. Newts and Salamanders of Europe. San Diego, CA: Academic Press Inc., 1996.

Larson, Allan. (1996). Caudata. Tree of Life Web Project.
http://tolweb.org/tree?group=Caudata&contgroup=Living_Amphibians. (Accessed: 2003).

Milner, A.R. 1988. The relationships and origins of living amphibians. Pp. 59-102 In M. J. Benton (Ed.), The Phylogeny and Classification of the Tetrapods. 1. Amphibians, Reptiles, Birds. Oxford University Press, Oxford.

Sumber gambar
http://evodisku.multiply.com/journal/item/24/amfibieen_evolutie_en_geologie

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