Assessing the diversity of Western North American Juga (Semisulcospiridae, Gastropoda)

Publication date: Available online 8 April 2019Source: Molecular Phylogenetics and EvolutionAuthor(s): Ellen E. Strong, Nathan V. WhelanAbstractJuga is a genus of freshwater gastropods distributed in Pacific and Interior drainages of the Pacific Northwest from central California to northern Washington. The current classification has relied heavily on features of the shell, which vary within and across drainages, and often intergrade without sharp distinctions between species. The only previous molecular analysis included limited population sampling, which did not allow robust assessment of intra- versus interspecific levels of genetic diversity, and concluded almost every sampled population to be a distinct OTU. We assembled a multilocus mitochondrial (COI, 16S) and nuclear gene (ITS1) dataset for ∼100 populations collected across the range of the genus. We generated primary species hypotheses using ABGD with best-fit model-corrected distances and further explored our data, both individual gene partitions and concatenated datasets, using a diversity of phylogenetic and species delimitation methods (Bayesian inference, maximum likelihood estimation, StarBEAST2, bGMYC, bPTP, BP&P). Our secondary species delimitation hypotheses, based primarily on the criterion of reciprocal monophyly, and informed by a combination of geography and morphology, supports the interpretation that Juga comprises a mixture of geographically widespread species and narrow range endemics. As might be e...
Source: Molecular Phylogenetics and Evolution - Category: Molecular Biology Source Type: research