Abstract
Molecular phylogenetic tools are often useful in distinguishing cryptic species with similar morphologies, but they can also be helpful in identifying morphotypes of a species, which displays completely different shapes. We performed molecular-phylogenetic analysis of supra-tidal green algae in the Kamchatka peninsula that belong to the order Prasiolales (Trebouxiophyceae, Chlorophyta). Based on rbcL sequences results, two new species were recorded for the first time in Kamchatka. Approximately 1.4% of the field-collected Rosenvingiella constricta had a unique uniseriate hood-like blade shape, although their rbcL sequences were 100% identical with typical multiseriate filamentous plants. Kamchatka’s population of R. constricta showed 99.4–99.6% identity in rbcL sequences with the populations from Canada and New Zealand. Another similar-looking Rosenvingiella species collected from the same locality had 93.5% identity of the rbcL gene sequence with R. constricta. Morphological and geographical analyses also suggested that this species might be a new species of the genus Rosenvingiella. Prasiola delicata was recorded for the first time in Kamchatka. The Kamchatka population of P. delicata showed 100% identity in rbcL gene sequence with the population from Vancouver, but differed from the Canadian population morphologically.
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