used by only a few authors, it is considered that B. japonicus is valid instead.

There are two subspecies, Western-Japanese common toad (Bufo japonicus japonicus) and Eastern-Japanese common toad (Bufo japonicus formosus). They are distinguished by the size of the tympanum, smaller in B. japonicus japonicus and larger in B. japonicus formosus. However, some taxonomic authorities consider B. japonicus formosus to be a separate species (B. formosus), leaving B. japonicus monotypic (having no subspecies).

B. japonicus formosus is

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