Bathyoncus

Bathyoncus is a genus of ascidian tunicates in the family Styelidae.

Species within the genus Bathyoncus include:
 * Bathyoncus arafurensis Monniot & Monniot, 2003
 * Bathyoncus herdmani Michaelsen, 1904
 * Bathyoncus lanatus Monniot & Monniot, 1991
 * Bathyoncus mirabilis Herdman, 1882
 * Bathyoncus tantulus Monniot & Monniot, 1991

Species names currently considered to be synonyms:
 * Bathyoncus enderbyanus Michaelsen, 1904 : synonym of Bathystyeloides enderbyanus (Michaelsen, 1904)