We all have a spirit or totem animal who guides us and keeps us safe throughout our lives. Once we've identified who ...

Annual Review of Ecology and Systematics, Vol. 25 (1994), pp. 351-375 (25 pages) Most animal phyla appeared in the Cambrian radiation, and many have a rich fossil record. The phylogenetic ...

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 ...