Department of Biological and Environmental Sciences, Troy University, Troy, AL, 36082, United States.
University of Georgia, Skidaway Institute of Oceanography, Savannah, GA, 31411, United States.
Eur J Protistol. 2020 Apr;73:125673. doi: 10.1016/j.ejop.2020.125673. Epub 2020 Jan 21.
The parasitic ciliate causing shrimp black gill (sBG) infections in penaeid shrimp has been identified. The sBG ciliate has a unique life cycle that includes an encysted divisional stage on the host's gills. The ciliature of the encysted trophont stage has been determined and is quite similar to that of the closely related apostomes Hyalophysa bradburyae and H. chattoni. Hyalophysa bradburyae is a commensal ciliate associated with freshwater caridean shrimp and crayfish, while H. chattoni is a common commensal found on North American marine decapods. Based on 18S rRNA gene sequence comparisons, the sBG ciliate is more closely related to the marine species H. chattoni than to the freshwater species H. bradburyae. The unique life cycle, morphology, 18S rRNA gene sequence, hosts, location, and pathology of the sBG ciliate distinguish this organism as a new species, Hyalophysa lynni n. sp.
导致对虾黑鳃病（sBG）的寄生纤毛虫已被鉴定。sBG 纤毛虫具有独特的生命周期，包括在宿主鳃上的包囊分裂阶段。已确定包囊滋养体阶段的纤毛结构，与密切相关的后口纤毛虫 Hyalophysa bradburyae 和 H. chattoni 非常相似。Hyalophysa bradburyae 是一种与淡水 caridean 虾和小龙虾共生的纤毛虫，而 H. chattoni 是一种常见的北美海洋十足目甲壳动物共生纤毛虫。基于 18S rRNA 基因序列比较，sBG 纤毛虫与海洋物种 H. chattoni 的亲缘关系比与淡水物种 H. bradburyae 的亲缘关系更密切。sBG 纤毛虫独特的生命周期、形态、18S rRNA 基因序列、宿主、位置和病理学将其鉴定为一个新物种，命名为 Hyalophysa lynni n. sp.
