Fossil evidence for sexual dimorphism in Monotomidae beetles from mid-Cretaceous Burmese amber

The male of Cretakarenni birmanicus Peris & Delclos, 2015 is reported from mid-Cretaceous Burmese amber. The male has distinct modifications on its head and a different tarsal formula from the female. These sexual dimorphisms are consistent with extant monotomid beetles, and suggests that sexual dimorphism in Monotomidae had already appeared in the Cretaceous...