The Overview section needs improvement regarding the taxonomic relationships among different kinds of sponges. For example, the section refers to Demosponges, sponges with silica, sponges with calcium carbonate skeletons, and Calcareous sponges. It is unclear whether these are four mutually exclusive taxa, whether some of these taxa overlap partially, or whether some of these taxa are completely subsumed under supraordinate taxa. Someone who understands the classification (assuming the classification is not controversial) and also can write clearly should edit the section with eye toward using clear and simple language to indicate the interrelationships among the sponge species groupings noted above. ~PB 05:18, 4 August 2019 (UTC)
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