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A new gastropod species,    Pseudobaikalia   michelae    Sitnikoiva &amp; Kovalenkova,  sp. n. , (family   Baicaliidae  ) is described from Lake Baikal. This is the first new species from the   Baicaliidae   for forty years. The new species is distinguished from its sister taxa by means of comparative morphology as well as analyses of DNA sequences (mtDNA and an intron of alpha-subunit gene of ATP-synthase). It was found in the southern and central-eastern parts of the lake where it occurs sympatrically with three other baicaliid species. Characters of the female reproductive system (i.e., a long oviduct loop with 2–3 narrow tube-like evaginations) and the aperture (i.e., oval shape with a simple outer lip) place these snails in the genus    Pseudobaikalia    Lindholm, 1909. The new species is most similar in its shell morphology to the northern Baikal species    P.   jentteriana    (smooth elongated shape) but differs by a more oval aperture that is slightly angled to the columella. Combined mitochondrial and nuclear sequences in a Bayesian analysis showed that all specimens of    P.   michelae    sp. n.  form a well-supported clade.

A new, genetically divergent species of Pseudobaikalia Lindholm, 1909 ( Caenogastropoda , Baicaliidae )