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.

Quick Facts Scientific classification, Families ...

Protomonaxonida Temporal range: 516.0–247 Ma PreꞒ Ꞓ O S D C P T J K Pg N [1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Porifera
Class:	Demospongiae
Order:	†Protomonaxonida Finks et al. 2004[2]
Families
†Choiidae †Halichondritidae †Hamptoniidae †Hazeliidae †Leptomitidae †Lobatospongia †Piraniidae †Takakkawiidae †Ulospongiellidae †Wapkiidae

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• Family †Choiidae Laubenfels, 1925
  • Genus †Allantospongia Rigby & Hou, 1995^[3]
  • Genus †Choia Walcott, 1920^[4]
  • Genus †Choiaella Rigby & Hou, 1995^[3]
  • Genus †Lenica Goryanskiy, 1977
• Family †Halichondritidae Rigby, 1986^[5]
  • Genus †Halichondrites Walcott, 1920^[4]
  • Genus †Pohlispongia Rigby & von Bitter, 2005^[6]
• Family †Hamptoniidae De Laubenfels, 1955
  • Genus †Hamptonia Walcott, 1920^[4]
  • Genus †Hamptoniella Rigby & Collins, 2004^[7]
• Family †Hazeliidae De Laubenfels, 1955
  • Genus †Crumillospongia Rigby, 1986^[5]
  • Genus †Falospongia Rigby, 1986^[5]
  • Genus †Hazelia Walcott, 1920^[4]
• 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
  • Genus †Moleculospina Rigby, 1986^[5]
  • Genus †Pirania Walcott, 1920^[4]
• Family †Takakkawiidae De Laubenfels, 1955
  • Genus †Takakkawia Walcott, 1920^[4]
• Family †Ulospongiellidae Rigby & Collins, 2004^[7]
  • Genus †Hapalospongia Rigby & Collins, 2004^[7]
  • Genus †Ulospongiella Rigby & Collins, 2004^[7]
• Family †Wapkiidae De Laubenfels, 1955
  • Genus †Wapkia Walcott, 1920^[4]

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
  • Genus Tethya Lamarck, 1814