Additional file 1.

Figure *.tif. Schematic visualization for the constrained model selection approaches. The unconstrained phylogenetic hypothesis was tested against four competing evolutionary scenarios in a model selection approach (refer to Table  3). Both scenarios concerning Carychium microgastropods are depicted, since the constraints likewise affected the splitting order of ancient nodes. E = Europe; A = Asia; N+C = North+Central America excl. C. nannodes; N = C. nannodes. Black dots indicate posterior probability ≥ 0.98. A: phylogenetic unconstrained hypothesis. A1a = C. cf. pessimum; A1b = C. nipponense; A2 = Carychium sp.3; A3 = C. cf. noduliferum. B: monophyletic Asian Carychium. C: monophyletic American Carychium. A1 = C. cf. pessimum + C. nipponense; A2 = C. cf. noduliferum + Carychium sp.3.

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Weigand et al. BMC Evolutionary Biology 2013 13:18   doi:10.1186/1471-2148-13-18