Abstract
ABSTRACT In this study, the cryptomonads of the northern territories of Russia were explored. Four strains were isolated from the different acidic habitats in the Middle Urals and the North of the European part of Russia. Cells of these strains are flattened in the dorsoventral plane, have an asymmetrical outline and are similar in size and shape to Cryptomonas erosa. Phylogenetic relationships inferred using maximum likelihood and Bayesian interference from datasets of nuclear-encoded SSU, LSU, ITS2 rDNA and psbA cpDNA show that the strains form one clade, which was divided into three subclades with high statistical support. One subclade was attributed to Cryptomonas erosa. Two other subclades represent species new to science. Comparison of ITS2 rRNA secondary structures with the compensatory base changes (CBC) approach confirmed the separation between C. erosa and the two new species, C. macilenta sp. nov. and C. parmana sp. nov. Comparison of nuclear V9 SSU and ITS1 rDNA sequences of two new species with metabarcoding data from 218 lakes in Europe showed that C. macilenta and C. parmana have not previously been recorded in Europe.
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