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Common sawfish : ウィキペディア英語版
Common sawfish

The common sawfish, ''Pristis pristis'', is a sawfish of the family Pristidae. It is found worldwide in tropical and subtropical coastal regions, but also enters freshwater. It has declined drastically and is considered critically endangered.〔
==Taxonomy==
Its taxonomy in relations to ''P. microdon'' and ''P. perotteti'' has caused considerable confusion, but recent evidence strongly suggests the three are conspecific (in which case ''P. microdon'' and ''P. perotteti'' are synonyms of ''P. pristis''), as morphological and genetic differences are lacking.〔Faria, V. V.; McDavitt, M. T.; Charvet, P.; Wiley, T. R.; Simpfendorfer, C. A.; Naylor, G. J. P. (2013). ''Species delineation and global population structure of Critically Endangered sawfishes (Pristidae).'' Zoological Journal of the Linnean Society 167: 136–164. doi:10.1111/j.1096-3642.2012.00872.x Retrieved 26 August 2013.〕 Three main clades based on NADH-2 genes were evident (Atlantic, Indo-West Pacific, and East Pacific), but these do not match the distributions claimed for ''P. pristis'' (circumtropical), ''P. microdon'' (Indo-West Pacific) and ''P. perotteti'' (Atlantic and East Pacific) respectively.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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