Until recently, Actiniaria had been classified by the classification system organized by Carlgren in 1949. This classification was based on several traditional morphological features such as mesenterial arrangement, basal disc, acontium, and sphincter muscle. Although this classification system had been used for around 60 years, it was recently called into question by several studies utilizing molecular phylogenetic analyses. The most comprehensive phylogenetic analyses clarified that the Carlgren classification system did not reflect the actual phylogenetic relationships, and thus a new classification system from suborder to superfamily was established. At the same time, new common morphological features were proposed as the traditional morphological features of sea anemones in Carlgren’s classification system were proven to not be monophyletic. Here, we introduce the new classification system and propose Japanese names for all taxa higher than family.