Abstract
The names Bergia Duchassaing & Michelotti, 1860, and Bergiidae Verrill, 1869, are respectively, senior subjective synonyms of Parazoanthus Haddon & Shackleton, 1891, and Parazoanthidae Delage & Herouard, 1901. The junior synonyms Parazoanthus and Parazoanthidae are in current and widespread use. In the interest of nomenclatural stability, we enact Articles 23.9.1 and 23.9.2 to reverse precedence of these names, thereby making Parazoanthus and Parazoanthidae nomi-na protecta, and Bergia and Bergiidaenomina oblita.