Stomatocysts of the rare heterotrophic chrysophyte, Paraphysomonas caelifrica, were discovered from a shallow ephemeral pond Tavolgasai (“Orenburgskiy” State Nature Reserve, Orenburg Region, Russia). Morphology of stomatocysts was studied using scanning electron microscopy. Stomatocysts of P. caelifrica are spherical and smooth with a cylindrical collar surrounding the regular pore. So, they do not belong to the stomatocyst 1 Duff and Smol as previously thought. The description of a new stomatocyst morphotype is provided.

中文翻译：

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关于 caelifrica 副藻类（原生藻菌、副藻类）的口囊

在 Tavolgasai 浅水池（俄罗斯奥伦堡地区“Orenburgskiy”国家自然保护区）中发现了稀有异养金藻植物Paraphysomonas caelifrica的口囊。使用扫描电子显微镜研究口囊的形态学。P. caelifrica的口囊是球形且光滑的，具有围绕规则孔的圆柱形颈环。因此，它们并不像之前认为的那样属于口囊 1 Duff 和 Smol。提供了新的口囊形态类型的描述。