2^ Affinities unknown; may not belong to Porifera. 



^* Includes: Acanthocyatha, Uranocyatha, Exocyatha. Synonyms: Pleospongia. 



^^ Synonyms: Planuloidea, Mionelminthes, Moruloidea. Catenata are now 

 considered to be parasitic dinoflagellates (Protozoa). 



2" Includes: Rhabdophora, Retioloidca. Acantbaspida, Acanthistida, Grapto- 

 blasti, Graptovermida are groups of uncertain status. 



