Journal
ZOOKEYS
Volume -, Issue 614, Pages 113-127Publisher
PENSOFT PUBL
DOI: 10.3897/zookeys.614.9283
Keywords
Eocene; micro-CT; 3-D reconstruction
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Funding
- German Research Council [DFG SCHM 3005/2-1, INST 292/119-1 FUGG, INST 292/120-1 FUGG]
- University of Rostock, International Office (Germany)
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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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