Some Precipitin Tests and Preliminary Remarks on the Systematic Relationships of Four South American Families of Frogs

Abstract

Phyletic divergences between neotropical Ranids and other South American Anurans (Leptodaetylidae. Hylidae, Bufonidae) were indicated by precipitin tests. Remarkable serological affinities between Phyllomedusa and Bufonids and Leptodactylids were discovered. The results warrant further studies on the problem of relationships between the true Hylids and the very specialized forms of the neotropical Phyllomedusa-Agalychnis stock.