Purpose

Endo-parasites of the bathypelagic king of herrings Regalecus glesne and oarfish Regalecus russelii are only known from few specimens opportunistically examined. As a consequence, there are few records of parasites from either Regalecus species. We report plerocercoid larvae of phyllobothriidean cestodes parasitizing an adult R. glesne stranded in Bahía de La Paz, Baja California Sur, Mexico.

Methods

Sixty-three plerocercoids were obtained from the intestine of R. glesne and characterized using morphological and molecular methods (nuclear 28S rDNA and mitochondrial cytochrome c oxidase I gene sequences).

Results

Following the morphological diagnostic criteria of scolex and muscle bands in the strobila, plerocercoids specimens were preliminary assigned to the genus Clistobothrium. Mitochondrial and nuclear DNA sequences indicate these plerocercoids correspond to Clistobothrium montaukensis Ruhnke, 1993.

Conclusion

Regalecus glesne is a new host known for C. montaukensis and this report is a new geographical record of C. montaukensis parasitizing species of the genus Regalecus previously known only from California and Florida, USA.

中文翻译：

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寄生于鲱鱼王 Regalecus glesne 的 Clistobothrium montaukensis (Cestoda: Phyllobothriidea) Plerocercoids 的分子鉴定

目的

深海鲱鱼之王Regalecus glesne和皇带鱼Regalecus russelii的体内寄生虫仅从少数标本中获知。因此，几乎没有任何一种Regalecus物种的寄生虫记录。我们报告了寄生在墨西哥南下加利福尼亚州拉巴斯巴伊亚德拉巴斯(Bahía de La Paz)的成年R. glesne寄生的 phyllobothriidean 绦虫的 plerocercoid 幼虫。

方法

从R. glesne的肠道中获得了 63 个 plerocercoids，并使用形态学和分子方法（核 28S rDNA 和线粒体细胞色素 c 氧化酶 I 基因序列）进行了表征。

结果

根据头节和肌带的形态学诊断标准，将头尾蚴标本初步归入 Clistobothrium属。线粒体和核 DNA 序列表明这些plerocercoids对应于Clistobothrium montaukensis Ruhnke, 1993。

结论

Regalecus glesne是已知的C. montaukensis的新宿主，这份报告是C. montaukensis寄生物种Regalecus的新地理记录，以前仅在美国加利福尼亚和佛罗里达州已知。