First record of Ishizakiella supralittoralis (Ostracoda, Cytheroidea, Leptocytheridae) from South Korea with a key to species of the genus

<i>Ishizakiella supralittoralis</i> (Schornikov, 1974) was collected from rock pools near Busan, South Korea, and is redescribed herein. It is the first record of this species from Korea, and also the first finding of a living population of <i>Ishizakiella</i> McKenzie & Sudijono, 1981 from the continental margins. Here we also comment on the diversity of <i>Ishizakiella</i> in Japan, possible existence of cryptic species, and provide a key to all six currently known species of this genus, including the two fossil ones.