Pseudokeronopsis rubra (Ehrenberg, 1836), type species of Pseudokeronopsis, is a widely reported but taxonomically confused species with most available sequences either misidentified or dubious. Based on the Yellow Sea population, of which the molecular data have been analyzed in a previous work, we redescribe P. rubra and try to clarify the identifications of the populations designated as P. rubra or those allocated to this species. Nonetheless, there is still a need of integrated investigation of the species combing both morphological and molecular data based on specimens from its type locality. Recent molecular analyses indicate a Yellow Sea population of Pseudokeronopsis (marked as P. cf. songi) likely represents a new species. Here we describe it as P. parasongi sp. nov. based on the specimens from the same population. The new species possesses a yellow-brownish body with both pigmented cortical granules and colorless blood cell-shaped structures underneath the body surface, invariably one contractile vacuole at 66% of body length and occasionally a second one at 25%, and the midventral complex terminating 2–23 μm ahead of 2–4 transverse cirri. It differs from closely related species by its yellow-brownish body color and separates from them in the ITS1-5.8S-ITS2 and COI genetic distances.

红色伪角毛虫（藻，1836），的模式种Pseudokeronopsis，与大多数可用的序列的广泛的报道，但在分类学上混淆物种或者误识别或可疑。基于先前工作中已经分析过其分子数据的黄海种群，我们重新描述了红假单胞菌，并试图澄清指定为红假单胞菌的种群或分配给该物种的种群的标识。尽管如此，仍然需要根据物种类型的样本，结合形态学和分子数据，对物种进行综合研究。最近的分子分析表明的黄海人口Pseudokeronopsis（标记为P.比照songi）可能代表了一个新物种。在这里，我们将其描述为P. parasongi sp.。十一月 基于相同人群的标本。新物种拥有黄褐色的体，在体表下具有着色的皮质颗粒和无色的血细胞状结构，在体长的66％处始终有一个收缩液泡，在25％处偶尔有第二个液泡，并且中腹复合体终止在2–4横向毛圈之前2–23μm。它与紧密相关的物种的不同之处在于其黄褐色的体色，并且在ITS1-5.8S-ITS2和COI遗传距离上与它们分开。