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 (general), taxonomy, a group is paraphyletic if it consists of the group's most recent common ancestor, last common ancestor and most of its descendants, excluding a few Monophyly, monophyletic subgroups. The group is said to be pa ...

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 foss ...

to modern sponges.

Families and genera

* Family † Choiidae Laubenfels, 1925 ** Genus †'' Allantospongia'' Rigby & Hou, 1995 ** Genus †''

Choia ''Choia'' is a genus of extinct demosponge ranging from the Cambrian until the Lower Ordovician periods. Fossils of ''Choia'' have been found in the Burgess Shale in British Columbia; the Maotianshan shales of China; the Wheeler Shale in Uta ...

'' 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 ''Tethya'' is a genus of sea sponges belonging to the family Tethyidae. Members of this genus all have a spherical body formBranch, G.M., Branch, M.L, Griffiths, C.L. and Beckley, L.E. 2010. ''Two Oceans: a guide to the marine life of southern ...

'' Lamarck, 1814

References

External links

*
Protomonaxonida
at fossilworks Sponge orders {{demosponge-stub