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Phylogenetic tree of species. C. briggsae, C. remanei and C. brenneri are all more closely related to each other than they are to C. elegans, while C. japonica is an outgroup within genus Caenorhabditis. Pristionchus pacificus, like C. elegans, is a hermaphroditic bacteriovore and belongs to the same clade of nematodes as C. elegans, but Brugia malayi and Trichinella spiralis are mammalian parasites from other clades in phylum Nematoda. Evolutionary distances are not to scale.
