Three living trachyleberidid ostracod species, <i>Acanthocythereis munechikai</i> Ishizaki, <i>Actinocythereis kisarazuensis</i> Yajima and <i>Hirsutocythere hanaii</i> Ishizaki, were discovered in the Tsushima Straits, <i>c</i>. 120 km east of Tsushima Island (north Island), N 34° 46′ E 130° 46′ at a depth of 116 m. This is the first description of complete appendages for these genera.