A taxonomic review of the coastal genus Iotarphia Cameron (Coleoptera: Staphylinidae: Aleocharinae) with a description of new species based on morphological and molecular characters Author Song, Jeong-Hun 0000-0003-0317-1457 Department of Agricultural Biology, National Institute of Agricultural Sciences, Wanju-gun, 55365, South Korea jeonghuns @ korea. kr; https: // orcid. org / 0000 - 0003 - 0317 - 1457 jeonghuns@korea.kr Author Osborn, Andrew W. 0000-0002-1702-3052 Honorary Research Associate, Queen Victoria Museum and Art Gallery, 2 Invermay Road, Launceston, Tasmania 7250, Australia awosborn @ dodo. com. au; https: // orcid. org / 0000 - 0002 - 1702 - 3052 awosborn@dodo.com.au Author Ahn, Kee-Jeong Department of Biology, Chungnam National University, Daejeon 34134, South Korea text Zootaxa 2021 2021-01-29 4920 3 417 427 journal article 8334 10.11646/zootaxa.4920.3.7 aea7d978-e7e9-460a-b618-c7ece0e0534c 1175-5326 4478173 2BEBF43A-C4AA-4462-9BD1-B68DBD0F4A44 Key to species of the genus Iotarphia 1. Elytra reddish brown; antennomere 5–7 slightly transverse; meso- and metaventral processes distinctly separated; male abdominal sternite VIII with 5 macrosetae on each side of midline............................ I. rufobrunnea Lee & Ahn - Elytra yellow with darker regions; antennomere 5–7 subquadrate; meso- and metaventral processes contiguous; male abdominal sternite VIII with 6–8 macrosetae on each side of midline.................................................. 2 2. Body length less than 3.0 mm; elytra yellow with basal darker region; antennomere 4 about as wide as long; eye about 1.1 times as long as temple; male abdominal sternite VIII with 7–8 macrosetae on each side of midline, posterior margin broadly rounded apically............................................................................ I. australis Cameron - Body length more than 4.0 mm; elytra yellow with lateral darker region; antennomere 4 longer than wide; eye about 1.7 times as long as temple; male abdominal sternite VIII with 6 macrosetae on each side of midline, posterior margin rounded apically............................................................................ I. magna Song & Ahn , sp. n.