Pseudohynobius puxiongensis (Fei & Ye, 2000)
Taxonomic Notes: Originally in monotypic Protohynobius, in subfamily Protohynobinae. Peng et al 2010 Mol Phyl Evol placed the species in Pseudohynobius but this was not accepted by Fei, Ye, Jiang 2012 Colored Atlas of Chinese Amphibians and their Distributions, who also ignored the study of Zheng et al. 2011 Mol Biol Evol 28;2521-2535.
Distribution and Habitat
Life History, Abundance, Activity, and Special Behaviors
Trends and Threats
Possible reasons for amphibian decline
Habitat modification from deforestation, or logging related activities
This species is the only five-toed hynobiid salamander found in the Hengduan Mountains, Tibetan Plateau, where four-toed species of Batrachuperus have been known for many years (see Peng et al. 2010). Based on the presence of a unique internasal bone, Fei and Ye (2000) placed this species in a new subfamily, Protohynobiinae, thought to be the most basal within the family Hynobiidae. The presence of the internasal bone was thought to be a primitive character retained in this species but lost by a common ancestor of all other hynobiid salamanders (Fei and Ye 2000). However, this placement was based on a single specimen, collected in 1965 and described in 2000. More recently, Peng et al. (2010) have reported finding more specimens at the type locality. These authors note that the new specimens match all characters mentioned in the description of the holotype except for two. First, in contrast to the holotype, the new specimens all lack the internasal bone, suggesting that the presence of this bone in the holotype was due to individual variation (Peng et al. 2010). Second, the holotype lacks a premaxillary fontanelle, but a very small fontanelle was present in one of the specimens examined; however, premaxillary fontanelles are known to vary in both presence/absence and size between individuals of the same species (Peng et al. 2010). These authors also sequenced the complete mitochondrial genome for this species plus two additional species of Pseudohynobius; these new sequences were used along with eighteen previously published hynobiid mitochondrial genome sequences to reconstruct a phylogeny of the family Hynobiidae and showing that Protohynobius puxiongensis is deeply nested within Hynobiidae. Peng et al. (2010) found that there was thus no support for the validity of the subfamily Protohynobiinae, and proposed changing the genus from Protohynobius to Pseudohynobius.
The karyotype is 2n=52, as is the case for the genus Pseudohynobius (Peng et al. 2010).
Fei, L. and Ye, C. (2000). ''A new hynobiid subfamily with a genus and new species of Hynobiidae from West China (Amphibia: Caudata).'' Cultum Herpetologica Sinica, 8, 64-70.
Fei, L., and Ye, C. (2004). Protohynobius puxiongensis. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.2. www.iucnredlist.org. Downloaded on 23 August 2010.
Peng, R., Zhang, P., Xiong, J.-L., Gu, H.-J., Zeng, X.-M., Zou, F.-D. (2010). ''Rediscovery of Protohynobius puxiongensis (Caudata: Hynobiidae) and its phylogenetic position based on complete mitochondrial genomes.'' Molecular Phylogenetics and Evolution, 56, 252-258.
Raffaëlli, J. (2007). Les Urodèles du monde. Penclen Edition, France.
Originally submitted by: Kevin Gin (first posted 2004-03-01)
Edited by: Kellie Whittaker (2010-08-23)
Species Account Citation: AmphibiaWeb 2010 Pseudohynobius puxiongensis: Puxiong's Protohynobiid <https://amphibiaweb.org/species/5816> University of California, Berkeley, CA, USA. Accessed Nov 28, 2023.
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Citation: AmphibiaWeb. 2023. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 28 Nov 2023.
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