Diexanthema hakuhomaruae sp. nov. (Copepoda: Siphonostomatoida: Nicothoidae) from the Hadal Zone in the Northwestern Pacific, with an 18S Molecular Phylogeny

Diexanthema hakuhomaruae sp. nov. (Copepoda: Siphonostomatoida: Nicothoidae) from the Hadal Zone in the Northwestern Pacific, with an 18S Molecular Phylogeny
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Diexanthema hakuhomaruae sp.

DOI:
10.1007/s11686-023-00676-z
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发表时间:
2023
影响因子:
1.5
通讯作者:
Ohta Mizuki
Ohta Mizuki
中科院分区:
医学4区
文献类型:
--
作者:
Kakui Keiichi;Fukuchi Jun;Ohta Mizuki

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目的双足类是深海等足类的体外寄生虫。该属目前有6种,均来自北大西洋。本文描述了在西北太平洋千岛-堪察加海沟7184 ~ 7186 m深度等足类中发现的一新种--双囊桡足类。我们确定了其16 S rRNA和18 S rRNA基因的部分序列,并构建了一个基于18 S的最大似然桡足类树,将其定位在遗传学上。通过形态学、细胞色素氧化酶亚基I(COI,cox 1)和18 S序列分析,鉴定了该桡足类的种属。nov.鉴定其寄主为Eugerdellacf.kurabyssalisGolovan,2015(桥体科)。这是首次在太平洋和深海中发现的双壳桡足类化石。bathydiaitaRichie,1975年,寄生在Nannoniscussp.上。(Nannonismiae)在大西洋,但不同于后者在有一个光滑的身体表面和腿5在腹外侧区域的尾小体。在18 S树中,D. hakuhomaruae是Rhizorhinaclade的姐妹群,这与基于形态学的假设是一致的,它们是密切相关的。
PurposeDiexanthemacopepods are ectoparasites on deep-sea isopods. This genus currently contains six species, all reported from the North Atlantic. Our study describes a new species ofDiexanthemafound on isopods from 7184 to 7186 m depth in the Kuril-Kamchatka Trench, northwestern Pacific.MethodsWe observed the copepod’s morphology, made camera-lucida drawings, and compared our species with congeners. We determined partial sequences for its 16S rRNA and 18S rRNA genes and constructed an 18S-based maximum-likelihood copepod tree to place it phylogenetically. We identified the host isopod species through morphology and cytochromecoxidase subunit I (COI, cox1) and 18S sequences.Results/ConclusionWe described the copepod asDiexanthema hakuhomaruaesp. nov.and identified its host asEugerdellacf.kurabyssalisGolovan, 2015 (Desmosomatidae). This is the firstDiexanthemacopepod from the Pacific and also from hadal depths.Diexanthema hakuhomaruaemost closely resemblesD. bathydiaitaRichie, 1975, parasitic onNannoniscussp. (Nannoniscidae) in the Atlantic, but differs from the latter in having a smooth body surface and leg 5 in the ventrolateral region of the urosome. In the 18S tree,D. hakuhomaruaewas the sister group to theRhizorhinaclade, which is consistent with the morphology-based hypothesis that they are closely related.
DOI: 10.1007/s11230-022-10075-z
发表时间: 2022
影响因子: 1.3
作者:
K. Kakui;M. Munakata
通讯作者: M. Munakata
DOI: 10.1007/s11230-015-9604-x
发表时间: 2016-01-01
影响因子: 1.3
作者:
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寄生在两种深海等足类动物上的软骨口科(Copepoda)一新属和两个新种
DOI: 10.1111/j.1096-3642.1975.tb01415.x
发表时间: 1975
影响因子: 2.8
作者:
L. Ritchie
通讯作者: L. Ritchie
DOI: 10.1093/molbev/msw054
发表时间: 2016-07-01
影响因子: 10.7
作者:
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来自深海等足类动物的一些新的寄生桡足类动物(管口类:尼克科)
DOI: 10.1080/00222938300770701
发表时间: 1983
影响因子: 0.8
作者:
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通讯作者: R. Lincoln