Who came first – sponges or comb jellies? A new study reaffirms that sponges are the oldest animal phylum – and restores the classical view of early animal evolution, which recent molecular analyses ...
A brief history and some fundamentals / Craig M. Young -- Phylum Porifera / Manuel Maldonado and Patricia R. Bergquist -- Phylum Cnidaria / Vicki J. Martin and Ron Koss -- Phylum Ctenophora / Mark Q.
The order Keratosa of the phylum Porifera, a monographic study Smithsonian Libraries and Archives ...
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