†family Leptomitidae De Laubenfels 1955 (demosponge)
Parent taxon: Protomonaxonida according to D. C. García-Bellido et al. 2007
Sister taxa: Choiidae, Halichondritidae, Hamptoniidae, Hazeliidae, Lobatospongia, Piraniidae, Sollasellidae, Takakkawiidae, Tethyidae, Ulospongiellidae, Wapkiidae
Subtaxa: Leptomitella, Leptomitus, Paraleptomitella, Wareiella
Ecology: stationary intermediate-level epifaunal suspension feeder