Two new genera of Lasiosynidae (Insecta, Coleoptera) from the Lower Cretaceous of Russia and Mongolia, and principal trends of the morphological evolution of the family.

Two new monotypic genera of the family Lasiosynidae, Microsyne gen. nov. and Crassisyne gen. nov., are described from two Early Cretaceous localities: Baisa (Eastern Siberia, Zaza Formation) and Sharyn-Gol (Mongolia, Sharyn-Gol Formation): Peculiar morphological features of different lasiosynid genera and general trends of their morphological evolution are discussed. [ABSTRACT FROM AUTHOR]