Arcturina serrulatus sp. nov. and a new record of Limnoria rhombipunctata (Crustacea: Malacostraca: Isopoda) from South Korea Author Song, Ji-Hun Author Park, Taeseo Author Kim, Won Author Min, Gi-Sik text Zootaxa 2017 4286 3 411 424 journal article 32738 10.11646/zootaxa.4286.3.8 e2b95cee-befa-4185-83ba-6ec3a9be90fb 1175-5326 828631 90B41B38-7AAE-4F3E-818B-ED36A7CFF007 Key to the species of the genus Arcturina . This key is based only on females of the species. Hence, it does not include A. cylindralis Pillai, 1963 , which was described based on sub-adult male specimens (see Remarks in Bamber 2008 ). 1. Pereonite 5 with lateral projection; head with strong medial projection.................. A. plumbiformis Nunomura, 2008 - Pereonite 5 with no lateral projection; head with small or no medial projection.....................................2 2. Antennular article 2 and 3 with serrate margin....................................... A. rhomboidalis Koehler, 1911 - Antennular article 2 and 3 without serrate margin............................................................ 3 3. Pereonite 4 strongly convex in lateral view.............................................. A. scutula Kensley, 1975 - Pereonite 4 smoothly curved or straight in lateral view........................................................4 4. Pereonite 4 widest anteriorly; dorsal ridges anteriorly divergent, absent from head........... A. hexagonalis Barnard, 1925 - Pereonite 4 widest anterior one-third part; dorsal ridges extending on to head......................................5 5. Body size < 3 mm ; pereonites 5–7 without dorsal ridges................................... A. psittacus Bamber, 2008 - Body size> 3.5 mm ; pereonites 5–7 with dorsal ridges........................................................6 6. Body with dorsal ridges converging on pereonite 3 and anterior of pereonite 4; head with no medial projection; pereopods 5–7 basis and ischium with no serrations................................................ A. triangularis Barnard, 1957 - Body with dorsal ridges not converging on pereonite 3 and anterior of pereonite 4, instead remaining more or less parallel; head with small medial projection; pereopods 5–7 basis and ischium with serrations................. A. serrulatus sp. nov.