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Parazoa
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==Porifera and Archaeocyatha== [[Porifera]] and [[Archaeocyatha]] show similarities such as benthic and sessile habitat and the presence of pores, with differences such as the presence of internal walls and septa in Archaeocyatha. They have been considered separate phyla,<ref>Whittaker, R. H. (1969). New concepts of kingdoms or organisms. Science 163 (3863): 150β160.</ref> however, the consensus is growing that Archaeocyatha was in fact a type of sponge that can be classified into Porifera.<ref>Stephen M. Rowland 2001, [https://www.jstor.org/stable/1307076?seq=1#page_scan_tab_contents Archaeocyaths: A History of Phylogenetic Interpretation] Journal of Paleontology Vol. 75, No. 6, 75th Anniversary Issue (Nov., 2001), pp. 1065-1078</ref>
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