The Family Petraliellidae has now been combined with the Petraliidae (Cook, Bock, Hayward & Gordon, 2018).
The family includes the genera:
Hippopetraliella page at NMITA
Petraliella page at NMITA
Reference: Tilbrook, Kevin J. & Cook, Patricia L., 2004.
Petraliellidae Harmer, 1957 (Bryozoa: Cheilostomata) from Queensland, Australia.
Systematics and Biodiversity 2: 319-339.
http://dx.doi.org/10.1017/S1477200004001525