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- Most known animal phyla appeared in the fossil record as marine species during the Cambrian explosi * Klaus Nielsen. ''Animal Evolution: Interrelationships of the Living Phyla'' (2nd edition). Oxford University Press, 2001. ...2 KB (215 words) - 16:37, 5 October 2014
- ...that they are in fact vertebrates. The chordates and three sister [[phylum|phyla]], the [[Hemichordata]], the [[Echinodermata]] and the [[Xenoturbellida]], ...hordates at some point in their lifetimes, and distinguish them from other phyla. ...34 KB (4,322 words) - 17:42, 5 October 2014