The genus , belonging to the family Dinobryaceae, has been documented to have only sporadic occurrences in freshwater habitats. However, the species diversity of this genus remains largely unexplored due to the scarcity of available molecular sequences. This limitation has significantly hindered a comprehensive understanding of both the species diversity and evolutionary relationships of the genus . In this study, a new species was described from Shanxi Province, China, based on detailed morphological observations and phylogenetic analyses. This species was characterized by a tube-like lorica, a spindle protoplast, two heterokont flagella, and oval or elliptic scales. In addition, phylogenetic analysis based on multi-genes (SSU, LSU, and L) indicated that strain SX231009 was closely related to . Given its distinct morphological characteristics and independent phylogenetic position, we propose the designation of this strain as a new species, The results of this study significantly expand the known diversity of the genus and provide valuable insights into the regional biodiversity and evolutionary history of freshwater chrysophytes.