Due to conflicting time estimates between studies, ancestral nodes can be assigned younger ages than their descendants. A smoothing technique is used to adjust these times so the resulting tree is ultrametric.

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Molecular Time Estimates (7 Studies)

Time	Title	First Author	Link	Year	Data
11.0	Higher-level salamander relationships and divergence dates inferred from complete mitochondrial genomes.	Zhang	http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=19595776&dopt=Abstract	2009	1 tree
10.0	Mitochondrial genomes and divergence times of crocodile newts: inter-islands distribution of Echinotriton andersoni and the origin of a unique repetitive sequence found in Tylototriton mt genomes.	Kurabayashi	http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=22531793&dopt=Abstract	2012	1 tree
5.6	Tree of Life Reveals Clock-Like Speciation and Diversification	Hedges	http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=25739733&dopt=Abstract	2015	3 trees
1.0	Phylogenomics Reveals Ancient Gene Tree Discordance in the Amphibian Tree of Life	Hime	http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=32359157&dopt=Abstract	2020	1 tree
7.8	What do ossification sequences tell us about the origin of extant amphibians?	Laurin	https://scholar.google.com/scholar?hl=en&q=What+do+ossification+sequences+tell+us+about+the+origin+of+extant+amphibians%3F&btnG=&as_sdt=1%2C3&as_sdtp=	2022	1 tree
6.5	A time-calibrated salamander phylogeny including 765 species and 503 genes	Stewart	http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=39681150&dopt=Abstract	2024	1 tree
16.5	Distinct latitudinal patterns of molecular rates across vertebrates	Cai	http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=40339119&dopt=Abstract	2025	1 tree