A new phytoseiid mite species, Amblyseius marunumus sp. n., is described and illustrated based on female and male specimens collected from Gunma, Japan. The new species belongs to the americanus species-group, due to the presence of setae J2 and Z1, and having setae z4 longer than z2. Amblyseius marunumus sp. n. is morphologically close to A. yadongensis Wu, but differs conspicuously in the length of the dorsal idiosomal setae z4, r3, S2, S5 and the shape of spermatheca.

中文翻译：

---

来自日本的Amblyseius Berlese（Acari：Phytoseiidae）的新种

一种新的植物寄生螨种，Amblyseius marunumus sp。n。是根据从日本群马市收集的雌雄标本进行描述和说明的。由于存在刚毛J2和Z1，并且刚毛z4比z2长，因此新物种属于美洲种组。Amblyseius marunumus sp。。在形态上接近A. yadongensis吴，但在长度显着不同的背idiosomal刚毛Z4，R 3，S2，S5和精囊的形状。