Strophomenata is an extinct class of brachiopods in the subphylum Rhynchonelliformea. Orders Billingsellida An order that contains the suborder Clitambonitidina (and others?) . Orthotetida An order or superfamily that includes the Chilidiopsoidea. Ontogeny given by Bassett and Popov (2017), resembling that of Kutorginides. Believed to be sister to Strophomenides, = Strophomenida + Billinsellida + Productida. Includes the Chileids (e.g. Coolinia). References External links Prehistoric protostome classes