Protomonaxonida is an extinct order of

sea sponges Sponges, the members of the phylum Porifera (; meaning 'pore bearer'), are a basal animal clade as a sister of the diploblasts. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through ...

. It is a

paraphyletic In taxonomy, a group is paraphyletic if it consists of the group's last common ancestor and most of its descendants, excluding a few monophyletic subgroups. The group is said to be paraphyletic ''with respect to'' the excluded subgroups. In ...

group gathering the most ancient species from the

Burgess Shale The Burgess Shale is a fossil-bearing deposit exposed in the Canadian Rockies of British Columbia, Canada. It is famous for the exceptional preservation of the soft parts of its fossils. At old (middle Cambrian), it is one of the earliest fo ...

to modern sponges.

Families and genera

* Family † Choiidae Laubenfels, 1925 ** Genus †'' Allantospongia'' Rigby & Hou, 1995 ** Genus †'' Choia'' Walcott, 1920 ** Genus †'' Choiaella'' Rigby & Hou, 1995 ** Genus †'' Lenica'' Goryanskiy, 1977 * Family † Halichondritidae Rigby, 1986 ** Genus †'' Halichondrites'' Walcott, 1920 ** Genus †'' Pohlispongia'' Rigby & von Bitter, 2005 * Family † Hamptoniidae De Laubenfels, 1955 ** Genus †'' Hamptonia'' Walcott, 1920 ** Genus †'' Hamptoniella'' Rigby & Collins, 2004 * Family † Hazeliidae De Laubenfels, 1955 ** Genus †'' Crumillospongia'' Rigby, 1986 ** Genus †'' Falospongia'' Rigby, 1986 ** Genus †'' Hazelia'' Walcott, 1920 * Family † Leptomitidae De Laubenfels, 1955 ** Genus †'' Leptomitus'' Walcott, 1886 ** Genus †'' Paraleptomitella'' Chen et al., 1989 ** Genus †'' Wareiella'' Rigby & Harris, 1979 * Genus †'' Lobatospongia'' Rigby et al., 2007 * Family † Piraniidae De Laubenfels, 1955 ** Genus †'' Moleculospina'' Rigby, 1986 ** Genus †'' Pirania'' Walcott, 1920 * Family † Takakkawiidae De Laubenfels, 1955 ** Genus †'' Takakkawia'' Walcott, 1920 * Family † Ulospongiellidae Rigby & Collins, 2004 ** Genus †'' Hapalospongia'' Rigby & Collins, 2004 ** Genus †'' Ulospongiella'' Rigby & Collins, 2004 * Family † Wapkiidae De Laubenfels, 1955 ** Genus †'' Wapkia'' Walcott, 1920 The following families from the order

Hadromerida Heteroscleromorpha is a subclass of demosponges within the phylum Porifera Sponges, the members of the phylum Porifera (; meaning 'pore bearer'), are a basal animal clade as a sister of the diploblasts. They are multicellular organisms th ...

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 Tethyidae is a family of sea sponges belonging to the order Tethyida. ReferencesTethyidae
at

Tethya'' Lamarck, 1814

References

External links

*
Protomonaxonida
at fossilworks Sponge orders {{demosponge-stub