New data on Biphyllidae (Coleoptera: Cucujiformia: Cleroidea) from Baltic amber: more diverse assemblage than previously assumed and its climatic interpretation.

Two new extinct species of false skin beetles (Biphyllidae) are described and illustrated based on inclusions in Baltic amber: <italic>Biphyllus lar</italic> sp. nov. and <italic>Coelodiplus uuu-impressa</italic> gen. et sp. nov. The new Eocene fossils are compared with the related extant and extinct representatives of the family. A new monotypic genus is erected for one fossil; another Eocene species is classified within the extant genus <italic>Biphyllus</italic> Dejean, 1821. The holotype of <italic>Diplocoelus probiphyllus</italic> Vitali, 2010 (Baltic amber) is re-examined and its diagnosis is emended. The present paper brings the total number of described biphyllid species from European succinite to three. A key to all documented fossil species of the family is provided. Several aspects of insect use as paleoenvironment and climate proxies are briefly discussed. On the basis of the revealed biphyllid palaeofauna and analysis of the climatic extremes of the modern distribution of the family in the Northern Hemisphere, the lowest possible annual temperature in the area of amberiferous forests of Eocene Northern Europe is hypothesised. [ABSTRACT FROM AUTHOR]