Neorhadinorhynchus nudus (Harada, 1938) Yamaguti, 1939 (Cavisomidae) was morphologically described from the frigate tuna Auxis thazard (Lacépède) (Scombridae) in Nha Trang, Pacific south Vietnam. Females of N. nudus were fully described for the first time in the Pacific. Its original inadequate description as Rhadinorhynchus nudus (Harada, 1938) was corrected in material from Fiji Island, the Red Sea and Pacific Vietnam and errors in the text and line drawings of Harada were repeated in subsequent major publications where it underwent considerable nomenclature changes. New descriptive and biogeographical notes are included. We also provided here the molecular characterization of the nuclear gene (18S) and the mitochondrial cytochrome c oxidase subunit 1 (cox1) sequence data of N. nudus. Furthermore, to elucidate the phylogenetic relationship of N. nudus within the family Cavisomidae and with other isolates were performed incorporating nuclear (18S) and mitochondrial (cox1) sequence data using maximum likelihood (ML) and Bayesian inference (BI). The phylogenetic results showed that N. nudus has a relationship with other isolates of the same species and the median-joining network showed the pattern of haplotypes that reflected the structure of the populations.

Neorhadinorhynchus nudus (Harada, 1938) Yamaguti, 1939（Cavisomidae）是从越南南部太平洋芽庄的护卫舰金枪鱼Auxis thazard (Lacépède) (Scombridae) 中进行形态学描述的。太平洋地区首次对雌性裸体猪笼草进行了全面的描述。它最初被描述为Rhadinorhynchus nudus （Harada，1938），在斐济岛、红海和越南太平洋地区的材料中得到了纠正，原田的文字和线条图上的错误在随后的主要出版物中重复出现，并经历了相当大的命名变化。包括新的描述性和生物地理注释。我们还在此提供了N. nudus的核基因 (18S) 和线粒体细胞色素c氧化酶亚基 1 (cox1) 序列数据的分子特征。此外，为了阐明N. nudus在 Cavisomidae 科内以及与其他分离株的系统发育关系，我们使用最大似然 (ML) 和贝叶斯推理 (BI) 结合核 (18S) 和线粒体 (cox1) 序列数据。系统发育结果表明， N. nudus与同一物种的其他分离株具有亲缘关系，中位连接网络显示出反映种群结构的单倍型模式。