Laboratory of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China.
Laboratory of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100049, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China.
Eur J Protistol. 2020 Oct;76:125737. doi: 10.1016/j.ejop.2020.125737. Epub 2020 Aug 3.
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.
红斑伪齿鸟（Ehrenberg，1836），伪齿鸟属的模式种，是一种广泛报道但分类上存在混淆的物种，大多数可用的序列要么被错误识别，要么存在疑问。基于黄海种群的分子数据，我们曾在之前的研究中进行过分析，对红斑伪齿鸟进行了重新描述，并试图澄清被指定为红斑伪齿鸟或归属于该物种的种群的身份。然而，仍然需要对该物种进行综合调查，结合来自其模式产地的形态和分子数据。最近的分子分析表明，黄海的伪齿鸟种群（标记为 P. cf. songi）可能代表一个新物种。我们根据同一种群的标本将其描述为 P. parasongi sp. nov.。该新种具有黄棕色的身体，身体表面下既有色素化的皮质颗粒，也有无色的血细胞状结构，始终有一个收缩泡位于身体长度的 66%处，偶尔在 25%处有第二个，腹中部复合体位于 2-4 个横刚毛之前 2-23 μm 处终止。它的黄棕色身体颜色与亲缘关系较近的物种不同，在 ITS1-5.8S-ITS2 和 COI 基因距离上与它们分开。
