THE order Chaetophorales is one of the filamentous green algae in the phylum Chlorophyta, which is widely distributed in freshwater ecosystems around the world (Guiry & Guiry, 2020;Sarma, 1986) and often attaches epiphytically to freshwater aquatic plants and other submerged surfaces in a wide variety of stagnant or fast-flowing water, and is an important primary productivity component of the aquatic ecosystem (Wehr et al., 2015). Some species of Chaetophorales have significant application prospects in water quality indication, wastewater treatment, and by-product processing (Harding

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There is only one species of Spongiosarcinopsis in the literature currently. It was found in gray soil in Russia for the first time. According to molecular data analysis results, the isolated algal strain is most closely related to Spongiosarcinopsis terrestris. Unlike Spongiosarcinopsis terrestris, the isolated strain was found on soil surfaces at high altitudes, the young vegetative cell is spherical, vegetative cells are relatively large, and pyrenoids are generally fewer. In view of such morphological differences, phylogenetic analysis results, and comparison of ITS2 secondary structure and ultrastructure, the strain isolated in the present study was proposed to be a novel species.