Analysis of ITS1 and ITS2 of Ribosomal DNA in Populations of <i>Planorbarius corneus</i> Snails (Gastropoda) from Leningradskaya Oblast and Kaliningradskaya Oblast (Russia)
Nucleotid sequences of internal transcribed spacers (ITS1 and ITS2) of rDNA were obtained and analyzed in populations of <i>Planorbarius corneus</i> snails from Leningradskaya Oblast and Kaliningradskaya Oblast. Close similarity between ITS1 and ITS2 of the snails from different areas proved the fact that <i>Planorbarius corneus</i> was a polymorphic but a uniform species.