Gnorimosphaeroma oregonense (Dana, 1852) is revised, a male neotype is designated, photographed, and illustrated; the species occurs from Vancouver British Columbia to the central California coast. 16S-rDNA sequences (~650 bp) for all available ethanol preserved species of Gnorimosphaeroma were used to hypothesize their relationships. Our analyses revealed a sister taxon relationship between the fully marine G. oregonense and the brackish to freshwater species, G. noblei. The oyster associated and introduced G. rayi is sister to a previously not recognized or identified, but genetically distinct, Gnorimosphaeroma sp. collected at two sites in San Francisco Bay. Gnorimosphaeroma sp. is probably also a western Pacific species based on its genetic relationship to G. rayi. Photographic comparisons are offered for G. oregonense (marine), G. noblei (freshwater), G. rayi (introduced), G. sp. (presumably introduced), and G. insulare (San Nicolas Island). Records of the holdings at the Los Angeles County Museum of Natural History are summarized. Without material available north of Vancouver through Alaska, the range of G. oregonense could not be genetically verified. This review includes a diagnosis and description of the genus Gnorimosphaeroma Menzies, 1954.

中文翻译：

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Gnorimosphaeroma oregonense (Dana, 1853)（甲壳纲、等足纲、球壳纲）的重新描述、新型命名和东北太平洋物种的 16S-rDNA 分子系统发育

Gnorimosphaeroma oregonense (Dana, 1852) 被修改，雄性新型被指定、拍照并插图；该物种分布于从不列颠哥伦比亚省温哥华到加利福尼亚州中部海岸。所有可用乙醇保存的 Gnorimosphaeroma 物种的 16S-rDNA 序列（~650 bp）用于假设它们的关系。我们的分析揭示了完全海洋的 G. oregonense 和咸淡水物种 G. Nobeli 之间的姐妹分类群关系。与牡蛎相关并引入的 G. rayi 是以前未被识别或鉴定但遗传上不同的 Gnorimosphaeroma sp. 的姐妹。在旧金山湾的两个地点收集。侏儒球菌属 sp. 根据其与 G. rayi 的遗传关系，它可能也是西太平洋物种。提供了 G. oregonense（海洋）、G. Nobeli（淡水）、G. rayi（引进）、G. sp. 的照片比较。（大概是引入的）和 G. insulare（圣尼古拉斯岛）。洛杉矶县自然历史博物馆的馆藏记录进行了总结。由于没有从温哥华北部到阿拉斯加的可用材料，俄勒冈 G. oregonense 的分布范围无法进行基因验证。本综述包括对 Gnorimosphaeroma Menzies 属的诊断和描述，1954 年。