摘要 : In the phytoplankton of northeastern West Siberian water bodies, Bacillariophyta were a dominant group of the 7 most abundant algal divisions, with the occurrence of the members of the class Centrophyceae varying from 27 to 100%. ... 展开 In the phytoplankton of northeastern West Siberian water bodies, Bacillariophyta were a dominant group of the 7 most abundant algal divisions, with the occurrence of the members of the class Centrophyceae varying from 27 to 100%. Scanning electron microscopy revealed complete species composition of the class Centrophyceae that dominates the phytoplankton of Lake Delingde, the Delingde and Bol'shaya Kheta rivers (<i>Aulacoseira</i>, 3 species; <i>Cyclostephanos</i>, 1; <i>Cyclotella</i>, 5; <i>Discostella</i>, 1; <i>Melosira</i>, 1; <i>Pliocaenicus</i>, 1; <i>Puncticulata</i>, 1; <i>Stephanodiscus</i>, 6). The phytoplankton of the class Centrophyceae in the Taz River now has a new member, <i>Puncticulata radiosa</i>. New species of the genus <i>Cyclotella</i> in West Siberian algal flora were revealed: <i>C. arctica</i>, <i>C. comensis</i>, and <i>C. vorticosa</i>. The findings helped more precisely define the ranges of the rare taxa and add new diagnostic features to the diagnoses of <i>C. comensis</i> and <i>Stephanodiscus invisitatus</i>. 收起