Family SCYPHIDIIDAE Kahl, 1933

Solitary, stalkless (yet sessile) forms; adherence to substrata by scopulary organelles forming flattened disc often prominently distinct from rest of body; one group (Ambiphrya) with permanent posterior trochal band; large, gelatinous pseudocolony formed by one free-living planktonic species (Gonzeella); generally found as epibionts on (gills of) fresh-water or marine fishes, molluscs, or other invertebrates (e.g., leeches, marine worms, etc.).

Ambiphrya Raabe, 1952. Few species.
Gonzeella Kufferath, 1953. Single species.
Ophrydiopsis Penard, 1922. Single species.
Paravorticella Kahl, 1933. Few species.
Scyphidia Dujardin, 1841. Many species.
Incertae sedis:
Pachystomos Rudzinska, 1952 (syn. Pachystomus). Single species [likely belongs in genus Scyphidia?] .