Detailed descriptions of larval and adult jaw anatomy are available for salamanders (Kleinteich and Haas, 2007; Ziermann and Diogo, 2013), caecilians (Kleinteich et al., 2014), and basal frogs (Johnston, 2011; Haas, 2001).
The fungus seemed unable to attack frogs, toads or legless snake-shaped amphibians called caecilians. But it quickly killed 41 of the 44 individual salamanders tested from Western temperate-zone species.
Armed with DNA sequence data, Alex Pyron, an assistant professor of biology at the George Washington University, sought to accurately piece together the 300-million-year storyline of how frogs, toads, salamanders and caecilians have moved across the planet throughout time.
Believed to be descended from lobe-finned fishes, modern amphibians are divided into three groups--frogs and toads, salamanders, and caecilians. Most prominent are the frogs and toads, which are grouped into 6000 species in 49 families.