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The fifth yuripopovinid specimen from mid-Cretaceous Kachin amber is described and illustrated, and Caulisoculus monlyae Zhuo et Chen, sp. nov. is erected based upon this new specimen. Caulisoculus monlyae sp. nov. can be easily distinguished from its two congeners by possessing eyestalks almost perpendicular to vertex, compound eyes nearly spherical, hemelytra with corium slightly sclerotized and darkly pigmented, and membrane with three large subparallel cells. Our new find suggests that the extinct true bug family Yuripopovinidae was highly diversified in the late Mesozoic.