Protomonaxonida is an extinct order of sea sponges. It is a paraphyletic group gathering the most ancient species from the Burgess Shale to modern sponges.
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- Family †Choiidae Laubenfels, 1925
- Family †Halichondritidae Rigby, 1986[5]
- Family †Hamptoniidae De Laubenfels, 1955
- Family †Hazeliidae De Laubenfels, 1955
- Family †Leptomitidae De Laubenfels, 1955
- Genus †Leptomitus Walcott, 1886
- Genus †Paraleptomitella Chen et al., 1989
- Genus †Pseudoleptomitus Botting et al., 2019[1]
- Genus †Wareiella Rigby & Harris, 1979
- Genus †Lobatospongia Rigby et al., 2007
- Family †Piraniidae De Laubenfels, 1955
- Family †Takakkawiidae De Laubenfels, 1955
- Family †Ulospongiellidae Rigby & Collins, 2004[7]
- Family †Wapkiidae De Laubenfels, 1955
The following families from the order Hadromerida are also sometimes placed in Protomonaxonida:
- Family Sollasellidae von Lendenfeld, 1887
- Genus †Luterospongia Rigby et al., 2008
- Genus †Mckittrickella Rigby et al., 2007
- Genus †Monaxoradiata Rigby & Bell, 2006
- Genus †Opetionella Zittel, 1878
- Genus †Rhizopsis Schrammen, 1910
- Genus †Stramentella Gerasimov, 1960
- Genus †Trichospongiella Rigby, 1971
- Family Tethyidae Gray, 1867
Porifera (Demospongea, Hexactinellida, Heteractinida, Calcarea). Treatise on Invertebrate Paleontology Part E, Revised E(3), R. M. Finks, R. E. H. Reid, and J. K. Rigby. 2004, pages 1-872
Rigby, J. K. (1986). "Sponges of the Burgess shale (Middle Cambrian), British Columbia". Palaeontographica Canadiana (2).
Rigby, J. K.; Collins, D. (2004). "Sponges of the Middle Cambrian Burgess Shale and Stephen Formations, British Columbia". ROM contributions in science. 1. ISBN 0-88854-443-X. ISSN 1710-7768.