Inversiulidae

Colonies are often encrusting sheets on shells or rocks. The zooids are characterised by having an operculum that opens in the opposite way to other cheilostome genera; i.e. the hinge is located at the 'top' (towards the growing edge) of the zooid.^{[citation needed]}

This family includes the following genera:^[1]

• Inversiula Jullien, 1888
• Parainversiula López-Gappa, Ezcurra, Schwaha & Pérez, 2023