Kingdom Animalia Linnaeus, 1758 - animals
Phylum Porifera Grant, 1836 - sponges
Class Demospongiae Sollas, 1885 - demosponges
Subclass Lithistida Schmidt, 1870
Order Tetralithistida Lagneau-Hérenger, 1962
1 Suborder Tetracladina Zittel, 1878
2 Suborder Dicranocladina Schrammen, 1924
3 Suborder Pseudorhizomorina Schrammen, 1901
4 Suborder †Didymorina Rauff, 1893 [monotypic]
see Suborder Didymmorina Rauff, 1893