Stichodactylidae Andres 1883

Family Stichodactylidae Andres, 1883 Dunn (1981) circumscribed Andres’ (1883) family Stichodactylidae to include only members of genera Stichodactyla and Heteractis. Following the reinstatement of family Heteractidae, England (1988) resurrected the genus Radianthus for the remaining members of the genus Heteractis that do not have macrobasic amastigophores in several regions of the body. However, recent molecular work recovered members of Thalassianthidae and R. magnifica nesting within Stichodactyla (e.g. Titus et al. 2019) rendering Stichodactylidae in its current circumscription paraphyletic. Rearrangement of the familial and generic circumscriptions and membership of Stichodactylidae and Thalassianthidae are anticipated, following a comprehensive revision of the group. Included Taxa Radianthus crispa (Hemprich & Ehrenberg, 1834) Formerly Heteractis crispa; England (1988) moved this species into the genus Radianthus. Radianthus doreensis (Quoy & Gaimard, 1883) Formerly Macrodactyla doreensis; Yap et al. (2023) moved this species into genus Heteractis but did not acknowledge England’s (1988) changes. Radianthus magnifica (Quoy & Gaimard, 1883) Formerly Heteractis magnifica; England (1988) moved this species into the genus Radianthus. Radianthus malu (Haddon & Shackleton, 1893) Formerly Heteractis malu; England (1988) moved this species into the genus Radianthus. Stichodactyla haddoni (Saville-Kent, 1893) No changes (see note below) * Stichodactyla gigantea (Forskal, 1775) No changes (see note below) * Stichodactyla mertensii Brandt, 1835 No changes