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Comparative phylogeography of commensal species may show congruent patterns where the species involved share a common history.  Temnosewellia  is a genus of flatworms, members of which live in commensal relationships with host freshwater crustaceans. By constructing phylogenetic trees based on mitochondrial COI and 28S nuclear ribosomal gene sequences, this study investigated how evolutionary history has shaped patterns of intraspecific molecular variation in two such freshwater commensals. This study concentrates on the flatworm  Temnosewellia albata  and its critically endangered crayfish host  Euastacus robertsi , which have a narrow climatically-restricted distribution on three mountaintops. The genetic data expands upon previous studies of  Euastacus  that suggested several vicariance events have led to the population subdivision of  Euastacus robertsi . Further, our study compared historical phylogeographic patterning of these species. Our results showed that phylogeographic patterns shared among these commensals were largely congruent, featuring a shared history of limited dispersal between the mountaintops. Several hypotheses were proposed to explain the phylogeographic points of differences between the species. This study contributes significantly to understanding evolutionary relationships of commensal freshwater taxa.

peerj

Shared phylogeographic patterns between the ectocommensal flatworm<i>Temnosewellia albata</i>and its host, the endangered freshwater crayfish<i>Euastacus robertsi</i>

Shared phylogeographic patterns between the ectocommensal flatwormTemnosewellia albataand its host, the endangered freshwater crayfishEuastacus robertsi