†order Spirophorida Bergquist and Hogg 1969 (demosponge)
Parent taxon: Tetractinomorpha according to R. K. Bambach et al. 2007
Sister taxa: Alpinothalamiidae, Atractosella, Axinellida, Belemnospongia, Criccospongiidae, Incrustospongia, Petrosites, Streptosclerophorida, Syltrochos
Subtaxa: Samidae
Ecology: stationary epifaunal suspension feeder
Distribution: