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''Rhyacosiredon'' was previously considered a separate genus within the family Ambystomatidae. However, cladistic analysis of the mole salamanders found the existence of ''Rhyacosiredon'' makes ''Ambystoma'' [[paraphyletic]], since the species are more closely related to some ''Ambystoma'' species than those species are to others in ''Ambystoma''. The stream-type morphology of these salamanders (which includes larvae and [[neoteny|neotenes]] with short gills and thicker [[gular fold]]s) may have led to their misclassification as a different genus.
''Rhyacosiredon'' was previously considered a separate genus within the family Ambystomatidae. However, cladistic analysis of the mole salamanders found the existence of ''Rhyacosiredon'' makes ''Ambystoma'' [[paraphyletic]], since the species are more closely related to some ''Ambystoma'' species than those species are to others in ''Ambystoma''. The stream-type morphology of these salamanders (which includes larvae and [[neoteny|neotenes]] with short gills and thicker [[gular fold]]s) may have led to their misclassification as a different genus.


The genus name ''Ambystoma'' was given by [[Johann Jakob von Tschudi]] in 1839,<ref name=tschudi>{{cite journal|last1=Tschudi|first1=Johann Jakob|title=Classification der Batrachier, mit Berucksichtigung der Fossilen Thiere dieser Abtheilung der Reptilien|journal=Mémoires de la Société des Sciences Naturelles de Neuchatel|date=1839|volume=2|issue=4|pages=57, 92|url=https://www.biodiversitylibrary.org/page/10595602}}</ref> and is traditionally translated as "cup-mouth",{{Citation needed|date=January 2009}}. Tschudi did not provide a derivation for the name, and many thought that he intended the name ''Amblystoma'', "blunt-mouth." Occasionally, old specimens and documents use the name ''Amblystoma''. Writing in 1907, [[Leonhard Stejneger]] offered a derivation of ''Ambystoma'' based on the contraction of a Greek phrase meaning "to cram into the mouth,"<ref name="stejneger">{{cite journal|last1=Stejneger|first1=Leonhard|title=Herpetology of Japan and Adjacent Territory|journal=Bulletin of the United States National Museum|date=1907|volume=58|page=24|url=https://www.biodiversitylibrary.org/page/7734859
The genus name ''Ambystoma'' was given by [[Johann Jakob von Tschudi]] in 1839,<ref name=tschudi>{{cite journal|last1=Tschudi|first1=Johann Jakob|title=Classification der Batrachier, mit Berucksichtigung der Fossilen Thiere dieser Abtheilung der Reptilien|journal=Mémoires de la Société des Sciences Naturelles de Neuchatel|date=1839|volume=2|issue=4|pages=57, 92|url=https://www.biodiversitylibrary.org/page/10595602}}</ref> and is traditionally translated as "cup-mouth",{{Citation needed|date=January 2009}}. Tschudi did not provide a derivation for the name, and many thought that he intended the name ''Amblystoma'', "blunt-mouth". Occasionally, old specimens and documents use the name ''Amblystoma''. Writing in 1907, [[Leonhard Stejneger]] offered a derivation of ''Ambystoma'' based on the contraction of a Greek phrase meaning "to cram into the mouth",<ref name="stejneger">{{cite journal|last1=Stejneger|first1=Leonhard|title=Herpetology of Japan and Adjacent Territory|journal=Bulletin of the United States National Museum|date=1907|volume=58|page=24|url=https://www.biodiversitylibrary.org/page/7734859


|hdl=2027/mdp.39015006820313|hdl-access=free}}</ref><ref name="lyon">{{cite journal|last1=Lyon Jr.|first1=M. W.|title=''Ambystoma'' not ''Amblystoma''|journal=Science|date=30 June 1916|volume=43|issue=1122|pages=929–930|jstor=1639383|doi=10.1126/science.43.1122.929-a|pmid=17793100}}</ref> but others have not found this explanation convincing.<ref name="scott">{{cite journal|last1=Scott|first1=Charles P. G.|title=''Amblystoma'' not ''Ambystoma''|journal=Science|date=1 September 1916|volume=44|issue=1131|pages=309–311|jstor=1642899|url=https://zenodo.org/record/2284246|doi=10.1126/science.44.1131.309-a|pmid=17840073|s2cid=5490505 }}</ref> In the absence of clear evidence that Tschudi committed a [[lapsus]], the name given in 1839 stands.
|hdl=2027/mdp.39015006820313|hdl-access=free}}</ref><ref name="lyon">{{cite journal|last1=Lyon Jr.|first1=M. W.|title=''Ambystoma'' not ''Amblystoma''|journal=Science|date=30 June 1916|volume=43|issue=1122|pages=929–930|jstor=1639383|doi=10.1126/science.43.1122.929-a|pmid=17793100}}</ref> but others have not found this explanation convincing.<ref name="scott">{{cite journal|last1=Scott|first1=Charles P. G.|title=''Amblystoma'' not ''Ambystoma''|journal=Science|date=1 September 1916|volume=44|issue=1131|pages=309–311|jstor=1642899|url=https://zenodo.org/record/2284246|doi=10.1126/science.44.1131.309-a|pmid=17840073|s2cid=5490505 }}</ref> In the absence of clear evidence that Tschudi committed a [[lapsus]], the name given in 1839 stands.
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