Animal evolution : interrelationships of the living phyla / Claus Nielsen. Nielsen, Claus. Phylogeny. Evolution (Biology) QH367.5 .N53 2001 591.38 NIA Includes bibliographical references and indexes. Oxford ; Oxford University , 2001. 2001. 2001 Text x, 563 p. : http://www.loc.gov/catdir/enhancements/fy0610/00050162-d.html http://www.loc.gov/catdir/enhancements/fy0610/00050162-t.html eng