Abstract
The combined (“total evidence”) phylogenetic inference was based on the comparison of the intronic nucleotide sequences of the ATP synthase α-subunit gene of 11 gastropod species belonging to the rapidly evolving Baikalian endemic family Baicaliidae, the morphological description of these species, and the previously published sequences of the mitochondrial gene coding the first subunit of cytochrome c oxidase. The phylogeny based on the intron sequences agrees well with the morphology. It is shown that sister species usually have similar substrate preferences. Certain discrepancy in the phylogenetic tree topology and the taxonomy based on morphological traits is probably due to the rapid morphological evolution of mollusks of the family Baicaliidae.
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