{"refrec":{"BRefID":124155,"RR":"<b>Fonseca, G.; Derycke, S.; Moens, T.</b> (2008). Integrative taxonomy in two free-living nematode species complexes. <i>Biol. J. Linn. Soc. 94(4)</i>: 737-753. <a href=\"http://dx.doi.org/10.1111/j.1095-8312.2008.01015.x\" target=\"_blank\">dx.doi.org/10.1111/j.1095-8312.2008.01015.x</a>","BEntID":118372,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Biol. J. Linn. Soc. 94(4)</i>: 737-753. <a href=\"https://dx.doi.org/10.1111/j.1095-8312.2008.01015.x\" target=\"_blank\">https://dx.doi.org/10.1111/j.1095-8312.2008.01015.x</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Fonseca, G.; Derycke, S.; Moens, T.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Fonseca, G. <i>et al.</i>","Englishabstract":"Integrative taxonomy considers species boundaries from multiple, complementary perspectives, with the main objective being to compare the observed data against the predictions of the methodologies used. In the present study we used three methods for delineating species boundaries within the cosmopolitan nematode species <i>Rhabditis (Pellioditis) marina</i> and <i>Halomonhystera disjuncta</i>. First, phylogenetic relationships among molecular sequences from the mitochondrial cytochrome oxidase c subunit 1 gene (COI), and from two nuclear regions, internal transcribed spacer (ITS) and D2D3, were analysed. Subsequently, multivariate morphometric analysis was used to investigate whether concordant molecular lineages were also morphologically distinct. When morphological differences were found, typological taxonomy was performed to identify fixed or non-overlapping characters between lineages. Interbreeding experiments were conducted between the two closest related lineages of <i>R. (P.) marina</i> to investigate potential reproductive isolation. This integrative approach confirmed the presence of several species within each nominal species: molecular lineages were concordant across two independent loci (COI and ITS), and were characterized by significant morphological divergence. Most lineages were also detectable in the D2D3 region, but were less resolved. The two lineages investigated in our study did not produce offspring. 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