Redescription of the genus Megastilicus Casey (Staphylinidae, Paederinae) with the description of a new species Author Żyła, Dagmara 0A7FEB0F-308C-4FDF-AD0D-8074BC69F0B3 Department of Invertebrate Zoology and Parasitology, University of Gdańsk, 80 - 308, Gdańsk, Poland. & Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, IA 50011, USA. & Museum and Institute of Zoology, Polish Academy of Sciences, Wilcza 64, 00 - 679, Warszawa, Poland. zyladagmara@gmail.com Author Koszela, Katarzyna 06C16202-4569-4156-9FB1-EA4DEE14AE88 Museum and Institute of Zoology, Polish Academy of Sciences, Wilcza 64, 00 - 679, Warszawa, Poland. kat.koszela@gmail.com text European Journal of Taxonomy 2021 2021-11-22 778 138 147 journal article 3366 10.5852/ejt.2021.778.1575 e9b6381f-da1b-47c3-b232-596c9c9af970 2118-9773 5718409 33DA5677-6AC0-4A27-A9B8-763FCCE4C416 Key to the species of Megastilicus Casey, 1889 1. Head longer than wide; antennomere 4 elongate; teeth on labrum blunt; eyes about ⅙ of head length, ¼ to ⅕ of temple length; median emargination of posterior margin of sternum VIII of ca ⅕ of sternum length, ventral process of aedeagus narrower in middle (parameral view); lateral plates of internal sac indistinctive ..................................................................................... M. formicarius Casey, 1889 – Head as long as wide; antennomere 4 transverse; teeth on labrum pointed; eyes about ⅕ of head length, ⅓ of temple length; median emargination of posterior margin of sternum VIII of ca ⅐ of sternum length; ventral process of aedeagus widened in middle (parameral view); lateral plates of internal sac distinctive .......................................................................................................... M. iowaensis sp. nov.