Our first "whose who" in the metazoan phylogeny lecture is on Placozoans and Poriferans.
Check out the following sites because animals that have probably existed for about 800 million years are just pretty darn interesting....
British Columbia's Glass Sponge Reefs
Sponge phylogeny, taxonomy, fossils
Concatenated Analysis Sheds Light on Early Metazoan Evolution and Fuels a Modern “Urmetazoon” Hypothesis
Sponges in the news:
Voracious Sponges In Underwater Caves Save Reefs
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