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The third fossil species of the genus    Trechus    Clairville, 1806 is described from Baltic amber:    T.   exhibitorius    sp. n.  Details of external and internal morphology were analysed using X-ray micro-computed tomography ( micro-CT ) and important diagnostic features of the internal male genital sac (endophallus) are described in detail for the first time in a fossil ground beetle. Based on these data, we could assign    T.   exhibitorius    sp. n.  to    Trechus    sensu stricto and this new fossil species seems to represent a basal branch of a lineage comprising species diverse groups of extant    Trechus    mainly distributed in the Caucasus and Anatolia. Thus, our results support previous studies suggesting that    Trechus    is a phylogenetically old lineage already present in the Eocene with numerous species.

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X-ray microscopy reveals endophallic structures in a new species of the ground beetle genus    Trechus    Clairville, 1806 from Baltic amber (  Coleoptera  ,   Carabidae  ,   Trechini  )