A new genus and species of centrohelid heliozoan Pinjata ruminata from the Tuzlukkol' River (Orenburg Region of Russia) and Gor'koe Lake (Chelyabinsk Region of Russia) is studied with light- and electron microscopy. Pinjata ruminata has two types of plate scales, partially running up the sides of the axopodia. Inner plate scales (3.2-4.9 × 1.5-2.6 μm) are flat, ovate-oblong and have a broad axial thickening and a thin electron-dense border. Outer plate scales (4.2-6.7 × 1.5-3.0 μm) are concave, elongated, of irregular shape, often curved, and broadened towards one end. Roundish depressions are forming two rows on both sides of the narrow axial thickening. The cells are attached to the substratum. Molecular phylogenetic analysis based on the SSU rDNA robustly placed P. ruminata in the family Yogsothothidae. This position is confirmed with the presence of five panacanthocystid increase regions. The morphology of the new genus is in a good accordance with diagnosis of the family. The status of a genus "Heteroraphidiophrys" is discussed. Other potential findings of Pinjata from literature are analyzed. Pinjata represents the third lineage of centrohelids, characterized with the presence of only tangentially oriented plate scales. The halophilic nature of Yogsothothidae is suggested.
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