Campanulinidae
Diagnostic description:
Colony stolonal or erect, hydrocaulus branched or unbranched; hydrotheca usually campanulate or cylindrical,with or without pedicel, always with operculum of several triangular flaps; sharply demarcated from hydrotheca or not; with or without diaphragm; with or without nematophores; gonophores as fixed sporosacs or free medusae.