Ariotus spinitibialis M. Saitȏ, new species is described from Honshu, Central Japan. This new species is closely related to Ariotus takedai M. Saitȏ & Young, 2015, differing from the latter in several respects, but notably by the presence of a pair of tibiale spines in male.
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Saito Masahiro (2025) studied this question.