Our first "whose who" in the metazoan phylogeny lecture is on Placozoans and Poriferans. Digital Zoology has great info on both Phyla (and all the info on Placozoans is there rather than in the textbook) including some virtual labs, crossword puzzles (great learning tool), pictures, and more...check it out...
Also 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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