 Mycetophilids, including some extant genera, are well represented in amber deposits and the group appears to have been well established and diversified by the Cretaceous period at the latest.Some 800 species (including some of the bioluminescent species) have been split into a separate family by Tuomikoski in 1966, Keroplatidae.This split is not universally recognized as yet, and many sources still include the keroplatid genera within the Mycetophilidae.