†Holocoelia (sponge)
Parent taxon: Porifera according to R. M. Finks et al. 2004
Sister taxa: Amorphofungia, Archaeocyatha, Calcarea, Caliculospongia, Clathrispongia, Coronacollina, Cotyliscus, Cribroscyphia, Cuneiphycus, Cupulochonia, Cyathophyscus, Cyclospongia, Demospongea, Dendrocoelia, Disjectoporidae, Drosdovia, Eocoryne, Glenodictyum, Heteractinida, Hexactinellida, Leiofungia, Limnoretheles, Matthewcyathus, Megalelasma, Microcoryne, Mussooriella, Nabaviella, Nostrocyathus, Oligoplagia, Palaeoierea, Phymoraphinia, Polyactinellidae, Scyphia, Shitangspongia, Sinoflabrum, Solactiniella, Sparsispongia, Stromatofungia, Stromatoporoidea, Tragos, Trammeria
Subtaxa: none
Ecology: stationary epifaunal suspension feeder