本州から記載され海外では台湾から知られている。マメ科のコマツナギ Indigofera pseudotinctoriaやヤハズソウ Kummerowia striataに見られる。本州には様々なマメ科に見られるハラオビアザミウマH. abdominalisも分布するが、本種は腹部の黄色の帯が2節（第4-5節）であるのに対し、ハラオビアザミウマは黄色の帯は1節（第5節）であることでルーペでも容易に識別できる。

This species was described from Honshu, Japan and is also known from Taiwan. It occurs on Indigofera pseudotinctoria and Kummerowia striata [Fabaceae] in Japan. H. abdominalis, which also occurs on several Fabaceae species and is distributed in Honshu. However, H. ekasi has the abdomen with two yellow segments (segments IV-V), whereas abdominalis has the abdomen with one yellow segment (segment V), even though looking by loupe.

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  Female

  

  Female

  

  Female

  

  Female

  

  Female, head and thorax

  

  Female, head and thorax

  

  Habitat：Indigofera pseudotinctoria コマツナギ