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Maximum-likelihood 28S rRNA gene phylogeny of the amphipods collected in the present study. This phylogeny includes sequences from Lefébure et al. (2006, 2007), Fišer et al. (2008), Trontelj et al. (2009), Flot (2010), Flot et al. (2010a) and Hartke et al. (2011). Filled arrows point at Niphargus sequences from the Frasassi caves in Italy, whereas empty arrows point at niphargid sequences from the present study.
