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Presbytis neglectus or P. femoralis, Colobine Molecular Phylogenies, and GenBank Submission of Newly Generated DNA Sequences

Great progress has been made in unravelling the evolutionary history of Asian colobines, largely through the use of dated molecular phylogenies based on multiple markers. The Presbytis langurs are a case in point, with more allopatric species being identified, recognition of Presbytis thomasi from Sumatra rather than P. potenziani from the Mentawai Islands as being the most basal species of the group, and the discovery that P. rubicunda from Borneo is nested among the Sumatran species and only made it to Borneo in the last 1.3 million years. Based on variation in mitochondrial d-loop, it has recently been argued that Malaysia’s P. femoralis femoralis is actually P. neglectus neglectus. Unfortunately, despite being available, sequences from the type locality, Singapore, were excluded from the analysis, and none of the newly generated sequences was deposited in GenBank. I manually reconstructed these sequences, which allowed me to present a molecular phylogeny that includes 8 additional sequences from West Malaysia and Singapore. P. neglectus from Malaysia and P. femoralis from Singapore form one monophyletic clade, with minimal divergence. I conclude that recognition of P. neglectus is erroneous and the name is a junior synonym of P. femoralis. Colobine taxonomy and systematics have advanced, and continue to advance, mostly by considering evidence from a wide range of individuals, species and data sets (molecular, behavioural and morphological) rather than focusing on single molecular markers from 1 or 2 species from one small geographic area. For an orderly taxonomic debate where evidence can be evaluated and reinterpreted it is essential that newly generated sequences are deposited in public repositories.