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ANDRIS BUKEJS, VITALII I. ALEKSEEV & MANFRED A. JÄCH (2015) The riffle beetles (Coleoptera: Elmidae) of the Eocene Baltic amber: Heterelmis groehni sp. nov. and Heterlimnius samlandicus (Bollow, 1940) comb. nov. Zootaxa 3986 (4): 452–460.