The ground beetle genus Bembidion Latreille in Baltic amber: Review of preserved specimens and first 3 D reconstruction of endophallic structures using X-ray microscopy (Coleoptera, Carabidae, Bembidiini) Author Schmidt, Joachim Author Michalik, Peter text ZooKeys 2017 662 101 126 http://dx.doi.org/10.3897/zookeys.662.12124 journal article http://dx.doi.org/10.3897/zookeys.662.12124 1313-2970-662-101 0250ADB4740A4DB283FA92E3BA0363D2 0250ADB4740A4DB283FA92E3BA0363D2 Eodontium http://zoobank.org/9A9BCB24-EDCA-44DB-B1FB-57AEC4033F56 Type species. Bembidion bukejsi sp. n. Derivatio nominis. The new subgenus name is an abbreviated combination of "Eocene" and " Odontium " and thus combines the period of the Earth history when the type species of the new subgenus lived, with the name of a probably related subgeneric taxon of Bembidion . Differential diagnosis. An extinct lineage of the OPO clade based on the combination of the seven male genital characters mentioned in the description of B. bukejsi sp. n. above. From most lineages of this highly diverse clade, Eodontium subgen. n. is distinguished by the presence of an angulate humeral margin and by the elytral discal setae, which are separated from the third stria. From all species of the subgenus Andrewesa and of the Hydrium and Odontium complexes which have these character states similarly or identically developed, Eodontium subgen. n. is easily distinguished by the impunctate elytral stria. The Eocene lineage differs additionally from Andrewesa by the thoroughly deeply impressed elytral striae and by the lack of elytral transverse depressions, and from the Hydrium and Odontium complexes by the large, roundish, deeply impressed laterobasal foveae of the pronotum, which is also distinctly less bulged on disc. Moreover, most species of the latter complexes differ markedly by the shape of pronotum, which has a base distinctly broader than apical margin and basolateral area between foveae and side margin convex. An angulate humeral margin is also developed in High Asian subgenus Peryphophila and some species of the Holarctic Plataphus complex. However, in these lineages of the OPO clade the elytral discal setae are situated in the third stria. In addition, the endophallic central sclerite complex is much smaller compared to Eodontium subgen. n.