The large and distinctive chalcidoid wasp Leptoomus janzeni Gibson, 2008, originally described from late Eocene Baltic amber, is newly recorded from coeval Rovno amber (Ukraine) based on a single wellpreserved female specimen. Only 66 species of Rovno hymenopterans (49%) are also known from Baltic amber. High resolution photomicrographs and measurements of the specimen are given. Some character states of the new specimen, such as a green metallic coloration, a bare and flat prepectus, location and number of multiporous plate sensillae on the flagellum, sclerotized spur vein of the hind wing, and two metatibial spur are reported in this species for the first time.

中文翻译：

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来自罗夫诺琥珀的 Leptoomus janzeni Gibson（膜翅目，Chalcidoidea）的第一次记录

2008 年的大型和独特的 chalcidoid 黄蜂 Leptoomus janzeni Gibson，最初是从晚始新世波罗的海琥珀中描述的，是根据单个保存完好的雌性标本从同时代的罗夫诺琥珀（乌克兰）中新记录的。波罗的海琥珀中也只有 66 种 Rovno 膜翅目昆虫（49%）。给出了样品的高分辨率显微照片和测量值。新标本的一些特征状态，如绿色金属色、裸露平坦的前突、鞭毛上多孔板感受器的位置和数量、后翅骨刺静脉和两个后胫骨骨刺在该物种中被报道为第一次。