Phylogenetic relationship of Caenorhabditis sp. 3 PS1010 to representative Caenorhabditis species and other nematode species discussed in this work, as determined by Kiontke et al. (2007), Meldal et al. (2007), and K Kiontke (pers. comm.). PS1010 is an outgroup to previously sequenced Caenorhabditis species, all of which closely resemble C. elegans, and most of which are formally considered part of an Elegans species group (Sudhaus and Kiontke 1996; Kiontke et al. 2007). PS1010 itself falls into a newly characterized Drosophilae species group, whose members substantially differ from Elegans species in morphology and mating behavior (K Kiontke, pers. comm.). However, PS1010 is still more closely related to C. elegans than non-Caenorhabditis nematodes such as Pristionchus, Meloidogyne, and Brugia, and hence, is more likely to show noncoding sequence conservation with C. elegans and C. briggsae. Phylogram not drawn to scale.
