Genetic and morphological diversification in gastropods of the Baicaliidae family

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Abstract

Background: Molecular phylogenetic studies of Baikalian endemic gastropod family Baicaliidae as well as the morphological comparisons have not yet provided a fully resolved phylogeny of this family. There is a need to increase the current set of markers to solve current difficulties. Intronic nuclear markers can be used as a valuable tool for phylogenetics. Methods: Nucleotide sequences for the intron of ATP-synthase alpha-subunit gene from 11 gastropod species belonging to the fast evolving Baikalian endemic family Baicaliidae together with the morphological traits and previously obtained mitochondrial COI sequences were used to build a synthetic species tree. Results: A Phylogenetic tree built using only intron sequences contains less polytomies than the one built using sequences of the mitochondrial gene CO1 and is compatible with the morphological views. Intronic marker provides high support for the interspecific clades. Topology of the tree built using the intronic marker mainly corresponds to morphology based systematics of eleven investigated species of this family. The only exception was Godlewskia wrzesniowski, which were placed within the clade of species from Korotnewia and Parabaikalia genera, though it has significant morphological differences from these genera. Conclusions: Sister species were shown to diverge within the same substrate preferences. Observed discrepancies between the species tree and current taxonomy of the group may be explained by fast morphological evolution in the Baicaliidae family.

About the authors

Mariya Vladimirovna Kovalenkova

Limnological Institrute, Siberian Division, Russian Academy of Sciences

Email: kovalenkovam@mail.ru
postgraduatе, рrincipal engineer. Laboratory of Molecular Systematics

Tatyana Yakovlevna Sitnikova

Limnological Institrute, Siberian Division, Russian Academy of Sciences

dr., senior researcher. Laboratory of Biology of aquatic invertebrates

Dmitriy Yuryevich Shcherbakov

Limnological Institrute, Siberian Division, Russian Academy of Sciences

Email: sherb@lin.irk.ru
dr., Head of Laboratory of Molecular Systematics

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Copyright (c) 2013 Kovalenkova M.V., Sitnikova T.Y., Shcherbakov D.Y.

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