RhopalonematidaeRhopalonematidae is a family of hydrozoans. The family comprises 15 genera and 36 species.GeneraAglantha Aglaura Amphogona Arctapodema Benthocodon Colobonema Crossota Pantachogon Persa Ransonia Rhopalonema Sminthea Tetrorchis Vampyrocrossota ''Voragonema''