Evdokimov Nikolay Anatolevich RussiaSaratovSaratov State Agrarian University named after V.I. Vavilov., 410012, Saratov, Teatralnaya sq., 1доцент кафедры ботаники, химии и экологииканд. биол. наукnikolayevdokimov@yandex.ru Author's articles The Rare and Endangered Species of Water Invertebrates Offered for Inclusion in the Third Edition of the Red Book of the Saratov Region