The previous page is sending you to https://bioone.org/journals/herpetological-monographs/volume-34/issue-1/0733-1347-31.4.131/Taxonomic-Review-of-South-American-Butter-Frogs--Phylogeny-Geographic/10.1655/0733-1347-31.4.131.pdf.

 If you do not want to visit that page, you can return to the previous page.