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.

已鉴定出对虾中引起虾黑g（sBG）感染的寄生纤毛虫。sBG纤毛虫具有独特的生命周期，其中包括宿主s上的一个分裂阶段。经刺的trophont阶段的纤毛已被确定，并与密切相关的信徒布拉德伯里氏菌和H. chattoni的纤毛相似。布拉德伯氏透明藻是与淡水caridean虾和小龙虾相关的共生纤毛虫，而H. chattoni是在北美海洋十足鱼类上常见的共生纤毛。基于18S rRNA基因序列比较，sBG纤毛虫与海洋物种H. chattoni的关系比与淡水物种的关系更紧密布拉德伯雷氏菌。sBG纤毛虫的独特生命周期，形态，18S rRNA基因序列，宿主，位置和病理学使该生物体成为一种新物种，即Hyalophysa lynni n。sp。