Caryophylliidae Dana, 1846
Rhizosmilia elata Cairns & Zibrowius, 1997
Rhizosmilia gerdae Cairns, 1978
Rhizosmilia maculata (Pourtalès, 1874)
Rhizosmilia multipalifera Cairns, 1998
Rhizosmilia multipaliferus Cairns, 1998
Rhizosmilia robusta Cairns in Cairns & Keller, 1993
Rhizosmilia sagamiensis (Eguchi, 1968)