A new fossil genus and species of Keroplatidae (Diptera, Bibionomorpha, Sciaroidea), Adamacrocera adami gen. et sp. nov., from the Upper Cretaceous Burmese amber is described and illustrated. Based on morphological evidence, it is placed in a new subfamily Adamacrocerinae subfam. nov. The new genus, as well as the subfamily, possesses the wing venation characteristic of the genera of some Sciaroidea incertae sedis, as well as that of the fossil families Archizelmiridae, Antefungivoridae and Mesosciophilidae, in combination with macrocerine-like habitus and male terminalia.

Department of Biology and Ecology Faculty of Science University of Ostrava Chittussiho 10 71000 Ostrava Czech Republic

Institute of Biology Pedagogical University of Kraków Podbrzezie 3 31 054 Kraków Poland

Institute of Systematics and Evolution of Animals Polish Academy of Sciences 31 016 Kraków Poland

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