北海道、本州、四国、九州及び伊豆諸島に分布し、中国からも知られている。頭部が細長く、成虫背に沿って背方に強く膨らむ。触角第７節と８節はほぼ融合する。Holothrips属に近縁だが、触角第４節に４本の感覚錐を持つことで区別できる（Holothrips属では３本）。琉球列島（沖縄島、石垣島）には近縁種O. nigripesが生息する。主に枯れ枝に住むが、キクイムシの坑道などから発見されることが多い。食菌性。

This species is distributed in Hokkaido, Honshu, Shikoku, Kyushu and the Izu Islands, and is also known from China. The head is elongated and strongly swollen dorsally along the mid line. The antennal segments VII and VIII are almost fused. Although closely related to the genus Holothrips, it can be distinguished by having four sense cones on the antennal segment IV (three sense cones in Holothrips). In the Ryukyu Islands (Okinawa and Ishigaki Islands), A closely related species, O. nigripes, is known). It mainly lives on dead branches, and is usually found in the galleries drilled by scolytid beetles. Fungus-feeder.

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  Female

  

  Female

  

  Female

  

  Female

  

  Female, head and thorax

  

  Female, head and thorax