Abstract
AbstractJacobsoniidae, comprising a small group of small-to-minute polyphagan beetles, is a family presently placed within Derodontiformia. No fossil jacobsoniid has been described to date. Here, we describe the first fossil jacobsoniid,Derolathrus groehnin. sp., based on two well-preserved individuals in middle Eocene Baltic amber. Micro–computed tomography (micro-CT) was used to reveal many diagnostic characters of the Recent genusDerolathrusSharp.Derolathrus groehniis compared with modernDerolathrusspecies and is noteworthy for the well-developed eyes and elongate prothorax.
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