Descriptions of two new deep-sea nemertean species from the genera Alvinonemertes and Sagornya gen. nov. (Hoplonemertea, Oerstediina) with discussion on close genetic relationship between deep-sea species

IF 2.3 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers Pub Date : 2025-02-01 DOI:10.1016/j.dsr.2024.104439

Alexei V. Chernyshev, Vasiliy G. Kuznetsov

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Abstract

In a recent study by Sagorny et al. (2022), nine new species of deep-sea hoplonemerteans, including five from the new genus Alvinonemertes Sagorny, von Döhren, Rouse & Tilic, 2022, have been described from off the Pacific coast of Costa Rica and the Oregon margin. The new species Alvinonemertes tilici sp. nov., found during the research cruise #94 aboard the R/V Akademik M.A. Lavrentyev in the Emperor Seamounts, has proven to be very close morphologically and genetically to A. dariae Sagorny et al., 2022 from the methane Parrita Seep, off Costa Rica. As a phylogenetic analysis based on five gene markers (cytochrome c oxidase subunit I, 16S rRNA, 18S rRNA, 28S rRNA, and histone H3) has shown, the genus Alvinonemertes is not monophyletic. Four species of Alvinonemertes are here segregated into a new genus, Sagornya gen. nov. The new species Sagornya iturupica sp. nov. is described based a specimen collected from the bathyal zone in the Sea of Okhotsk. This species is close genetically to S. tatjanae (Sagorny et al., 2022) comb. n. from seeps along the Oregon margin. The family Oerstediidae is divided into two sister groups: the subfamilies Oerstediinae and Tetranemertinae subfam. nov. To date, the new clade Gononemertes is the largest clade in the family Oerstediinae in terms of number of deep-sea and symbiotic species. Examples of close genetic similarity between deep-sea species from the genera Nemertovema, Tetrastemma, Alvinonemertes, Sagornya, and Carinina are considered. The study has shown that the genetic differences between deep-sea hoplonemerteans from the western and eastern Pacific Ocean are lower than those between sibling hoplonemertean species from Pacific shallow waters off North America and Asia. A hypothesis is advanced here that species with limited geographical ranges are frequently found among deep-sea nemerteans. The wide distribution of deep-sea hoplonemerteans can be provided by long-swimming lecithotrophic larvae, as in Cratenemertidae sp. MCZ IZ 45644.

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Alvinonemertes属和Sagornya gen. 11 . （Hoplonemertea, Oerstediina）两种深海水母新种记述及深海种间亲缘关系的探讨

在Sagorny et al.（2022）最近的一项研究中，发现了9个新的深海单翅目动物物种，其中包括5个来自新属Alvinonemertes Sagorny， von Döhren, Rouse &；人们在哥斯达黎加太平洋沿岸和俄勒冈州边缘发现了2022年的Tilic。新物种Alvinonemertes tilici sp. nov.是在皇帝海山的R/V Akademik M.A. Lavrentyev号上进行的第94次研究巡航中发现的，已被证明在形态和遗传上与A. dariae Sagorny等人非常接近，2022年在哥斯达黎加附近的甲烷Parrita Seep中发现。基于5个基因标记（细胞色素c氧化酶亚基I、16S rRNA、18S rRNA、28S rRNA和组蛋白H3）的系统发育分析表明，Alvinonemertes属不是单系的。四种Alvinonemertes在这里被分离成一个新属，Sagornya gen. 11 .新种Sagornya iturupica sp. 11 .是根据在鄂霍次克海深海区收集的标本描述的。该物种在遗传上接近S. tatjanae （Sagorny et al., 2022）梳子。从俄勒冈州的边缘渗出。osterdidiae家族分为两个姐妹群：osterdidiae亚科和tetranemertiae亚科。11 .迄今为止，就深海和共生物种的数量而言，Gononemertes新分支是osterdiinae科中最大的分支。考虑了Nemertovema、Tetrastemma、Alvinonemertes、Sagornya和Carinina属的深海物种之间密切遗传相似性的例子。这项研究表明，来自西太平洋和东太平洋的深海海栖动物之间的基因差异低于来自北美和亚洲太平洋浅水的兄弟海栖动物之间的基因差异。这里提出了一种假设，即在深海内默特动物中经常发现地理范围有限的物种。深海底栖动物的广泛分布可由长时间游动的食电营养幼虫提供，如Cratenemertidae sp. MCZ IZ 45644。

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来源期刊

Deep-Sea Research Part I-Oceanographic Research Papers 地学-海洋学

CiteScore

4.60

自引率

4.20%

发文量

144

审稿时长

18.3 weeks

期刊介绍： Deep-Sea Research Part I: Oceanographic Research Papers is devoted to the publication of the results of original scientific research, including theoretical work of evident oceanographic applicability; and the solution of instrumental or methodological problems with evidence of successful use. The journal is distinguished by its interdisciplinary nature and its breadth, covering the geological, physical, chemical and biological aspects of the ocean and its boundaries with the sea floor and the atmosphere. In addition to regular "Research Papers" and "Instruments and Methods" papers, briefer communications may be published as "Notes". Supplemental matter, such as extensive data tables or graphs and multimedia content, may be published as electronic appendices.