Descriptions of two new species of Rhizorhina Hansen, 1892 (Copepoda: Siphonostomatoida: Nicothoidae) parasitic on tanaidacean crustaceans, with a note on their phylogenetic position
Descriptions of two new species of Rhizorhina Hansen, 1892 (Copepoda: Siphonostomatoida: Nicothoidae) parasitic on tanaidacean crustaceans, with a note on their phylogenetic position
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DOI：
10.1007/s11230-015-9604-x
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发表时间：
2016-01-01
影响因子：
1.3
通讯作者：
Kakui, Keiichi
中科院分区：
文献类型：
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作者：
Kakui, Keiichi
描述了两种烟状桡足类新种。在北太平洋151-136米深处收集的一种细鳍鱼（Leptochelia sp.）上发现的Rhizorhina ohtsukai n. sp.与Rhizorhina aesthetes Boxshall & Harrison（1988）最相似，但可以通过拥有较窄的身体和圆形的前端以及在性器的位置来区分。在中国东海1595 ~ 1557米深度采集的一种拟南芥（Fageapseudes sp.）上发现的soyoae n. sp.与Rhizorhina tanaidaceae Gotto， 1984最相似，但不同之处是其体较窄，前端较圆。从这两只桡足类动物中获得了细胞色素c氧化酶亚基I （COI）基因的部分核苷酸序列，以便将来进行条形码鉴定。基于18S rRNA基因的系统发育重建将桡足类动物置于Siphonostomatoida Burmeister， 1835，与nicothoid Choniosphaera maenadis （Bloch & Gallien, 1933）中，并与Rhizorhina spp.枝分开，这表明Nicothoidae Dana， 1849不是单系的。这是第三篇关于桡足类动物寄生在甲壳类动物身上的报道。
Two new species of nicothoid copepod are described. Rhizorhina ohtsukai n. sp. found on a leptocheliid (Leptochelia sp.) collected at depths of 151-136 m in the North Pacific Ocean is most similar to Rhizorhina aesthetes Boxshall & Harrison, 1988 but can be distinguished by the possession of a narrower body with a rounded anterior end, and in the position of the gonopores. Rhizorhina soyoae n. sp. found on an apseudid (Fageapseudes sp.) collected at depths of 1,595-1,557 m in East China Sea most closely resembles Rhizorhina tanaidaceae Gotto, 1984 but differs in having a narrower body with a rounded anterior end. Partial nucleotide sequences of the cytochrome c oxidase subunit I (COI) gene were obtained from the two copepods in order to enable future barcoding. A phylogenetic reconstruction based on the 18S rRNA gene placed the copepods within the Siphonostomatoida Burmeister, 1835, with the nicothoid Choniosphaera maenadis (Bloch & Gallien, 1933), and separate from the Rhizorhina spp. clade, suggesting that the family Nicothoidae Dana, 1849 is not monophyletic. This is the third report of copepods parasitic on tanaidacean crustaceans.