Iotarphia, Cameron, 1943

Song, Jeong-Hun, Osborn, Andrew W. & Ahn, Kee-Jeong, 2021, A taxonomic review of the coastal genus Iotarphia Cameron (Coleoptera: Staphylinidae: Aleocharinae) with a description of new species based on morphological and molecular characters, Zootaxa 4920 (3), pp. 417-427 : 421

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.