A new genus and species of centrohelid heliozoan Pinjata ruminata from the Tuzlukkol’ River (Orenburg Region of Russia) and Gorʼkoe 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.

中文翻译：

---

Pinjata ruminata 基因。等 sp. n. – 来自咸水河的 Centrohelid 家族 Yogsothothidae（Haptista：Centroplasthelida）的新成员

使用光学和电子显微镜研究了来自 Tuzlukkol' 河（俄罗斯奥伦堡地区）和 Gorʼkoe 湖（俄罗斯车里雅宾斯克地区）的中心日光动物 Pinjata ruminata 的新属和种。Pinjata ruminata 有两种类型的板鳞，部分向上延伸到轴足的两侧。内板鳞片（3.2-4.9 × 1.5-2.6 μm）扁平，卵形椭圆形，具有宽阔的轴向增厚和薄的电子致密边界。外板鳞片 (4.2–6.7 × 1.5–3.0 μm) 呈凹形、拉长、形状不规则、经常弯曲并朝一端变宽。圆形凹陷在狭窄的轴向增厚两侧形成两排。细胞附着在基质上。基于 SSU rDNA 的分子系统发育分析有力地将 P. ruminata 置于 Yogsothothidae 家族中。这一立场通过存在五个全棘囊细胞增加区域得到证实。新属的形态学与该科的诊断非常吻合。讨论了“Heteroraphidiophrys”属的地位。分析了文献中 Pinjata 的其他潜在发现。Pinjata 代表着中心线虫的第三个谱系，其特征是仅存在切向定向的板块鳞片。暗示了 Yogsothothidae 的嗜盐性质。特征在于仅存在切向定向的板鳞片。暗示了 Yogsothothidae 的嗜盐性质。特征在于仅存在切向定向的板鳞片。暗示了 Yogsothothidae 的嗜盐性质。