Sponges were some of the very first invertebrates, known at least since the Cambrian period 550 MYA, but reaching their peak in the Mesozoic (though Walking with Dinosaurs ep. 3 does not show this).
| Graph IRI | Count |
|---|---|
| http://dbkwik.webdatacommons.org | 13 |
![[RDF Data]](/fct/images/sw-rdf-blue.png)
