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.
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