• 1) The Tree of Life web site: http://phylogeny.arizona.edu/tree/phylogeny.html

• 2) Brusca, R.C. & G.J. Brusca. 1990. Invertebrates, Sinauer.

• 3) Meglitsch, P.A. & F.R. Schram. Invertebrate Zoology, 3rd Ed, Oxford.

• 4) Nielsen, C. 1995. Animal Evolution. Interrelationships of the Living Phyla, Oxford.

• 5) Pearse, V., J. Pearse, M. Buchsbaum & R. Buchsbaum. 1987. Living Invertebrates, Blackwell.

• 6) Ruppert, E.E. & R.D. Barnes. 1994. Invertebrate Zoology, 6th Ed, Saunders.

• 7) Eernisse, D. J., J. S. Albert, and F. E. Anderson. 1992. Annelida and Arthropoda are not sister taxa: A phylogenetic analysis of spiralian metazoan morphology. Systematic Biology 41:305-330.

• 8) Baldauf, S.L., A.J. Roger, I. Wenk-Siefert and W.F. Doolittle. 2000. A kingdom-level phylogeny of eukaryotes based on combined protein data. Science 290:972-977.

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