Blaxter ML, De Ley P, Garey JR, Liu LX, Scheldeman P, Vierstraete A, Vanfleteren JR, Mackey LY, Dorris M, Frisse LM, Vida JT, Thomas WK. (1998) A molecular evolutionary framework for the phylum Nematoda. Nature 392, 71-74.
 

5 March 1998 Vol 392:  Cover image: Nematodes are ubiquitous (one-in-five of the human population carry Ascaris), and the free-living nematode Caenorhabditis is one of the best understood of organisms. But surprisingly, little is known about the interrelationships within the phylum Nematoda. This week the results of an international collaboration applying modern phylogenetic methods to nematodes are published. One interesting implication of the phylogeny is that parasitism  has arisen many times from different free-living groups. [Letters, p. 71; News and Views, p. 25] Main cover picture shows Acrobeles complexus. Courtesy M. Mundo, K. Bozhilov & J. Baldwin (Dept of Nematology and Analytical Electron Microscopy Facility, Univ. California, Riverside).